SLES 12 Security Technical Implementation Guide

Version

SLES-12-010140

Vuln IDs

V-217116
V-77073

Rule IDs

SV-217116r603262_rule
SV-91769

Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.

Checks: C-18344r369504_chk

Verify the SUSE operating system enforces a delay of at least four (4) seconds between logon prompts following a failed logon attempt. Check that the SUSE operating system enforces a delay of at least four (4) seconds between logon prompts following a failed logon attempt with the following command: # grep FAIL_DELAY /etc/login.defs FAIL_DELAY 4 If the value of "FAIL_DELAY" is not set to "4", "FAIL_DELAY" is commented out, or "FAIL_DELAY" is missing, then this is a finding.

Fix: F-18342r369505_fix

Configure the SUSE operating system to enforce a delay of at least four (4) seconds between logon prompts following a failed logon attempt. Add or update the following variable in "/etc/login.defs" to match the line below ("FAIL_DELAY" must have a value of "4" or higher): FAIL_DELAY 4

b

The SUSE operating system must enforce passwords that contain at least one upper-case character.

IA-5 - Medium - CCI-000192 - V-217117 - SV-217117r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000192

Version

SLES-12-010150

Vuln IDs

V-217117
V-77075

Rule IDs

SV-217117r603262_rule
SV-91771

Use of a complex password helps increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks: C-18345r369507_chk

Verify the SUSE operating system enforces password complexity by requiring that at least one upper-case character. Check that the operating system enforces password complexity by requiring that at least one upper-case character be used by using the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so ucredit=-1 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "ucredit=-1", this is a finding.

Fix: F-18343r369508_fix

Configure the SUSE operating system to enforce password complexity by requiring at least one upper-case character. Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "ucredit=-1" after the third column.

b

The SUSE operating system must enforce passwords that contain at least one lower-case character.

IA-5 - Medium - CCI-000193 - V-217118 - SV-217118r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000193

Version

SLES-12-010160

Vuln IDs

V-217118
V-77077

Rule IDs

SV-217118r603262_rule
SV-91773

Use of a complex password helps increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks: C-18346r369510_chk

Verify the SUSE operating system enforces password complexity by requiring that at least one lower-case character. Check that the operating system enforces password complexity by requiring that at least one lower-case character be used by using the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so lcredit=-1 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "lcredit=-1", this is a finding.

Fix: F-18344r369511_fix

Configure the SUSE operating system to enforce password complexity by requiring at least one lower-case character. Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "lcredit=-1" after the third column.

b

The SUSE operating system must enforce passwords that contain at least one numeric character.

IA-5 - Medium - CCI-000194 - V-217119 - SV-217119r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000194

Version

SLES-12-010170

Vuln IDs

V-217119
V-77079

Rule IDs

SV-217119r603262_rule
SV-91775

Use of a complex password helps increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.

Checks: C-18347r369513_chk

Verify the SUSE operating system enforces password complexity by requiring that at least one numeric character. Check that the operating system enforces password complexity by requiring that at least one numeric character be used by using the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so dcredit=-1 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "dcredit=-1", this is a finding.

Fix: F-18345r369514_fix

Configure the SUSE operating system to enforce password complexity by requiring at least one numeric character. Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "dcredit=-1" after the third column.

b

The SUSE operating system must enforce passwords that contain at least one special character.

IA-5 - Medium - CCI-001619 - V-217120 - SV-217120r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-001619

Version

SLES-12-010180

Vuln IDs

V-217120
V-77081

Rule IDs

SV-217120r603262_rule
SV-91777

Use of a complex password helps increase the time and resources required to compromise the password. Password complexity or strength is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password complexity is one factor in determining how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised. Special characters are not alphanumeric. Examples include: ~ ! @ # $ % ^ *.

Checks: C-18348r369516_chk

Verify the SUSE operating system enforces password complexity by requiring that at least one special character. Check that the operating system enforces password complexity by requiring that at least one special character be used by using the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so ocredit=-1 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "ocredit=-1", this is a finding.

Fix: F-18346r369517_fix

Configure the SUSE operating system to enforce password complexity by requiring at least one special character. Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "ocredit=-1" after the third column.

b

The SUSE operating system must require the change of at least eight (8) of the total number of characters when passwords are changed.

IA-5 - Medium - CCI-000195 - V-217121 - SV-217121r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000195

Version

SLES-12-010190

Vuln IDs

V-217121
V-77087

Rule IDs

SV-217121r603262_rule
SV-91783

If the SUSE operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for attempts at guessing and brute-force attacks. The number of changed characters refers to the number of changes required with respect to the total number of positions in the current password. In other words, characters may be the same within the two passwords; however, the positions of the like characters must be different.

Checks: C-18349r369519_chk

Verify the SUSE operating system requires at least eight (8) characters be changed between the old and new passwords during a password change. Check that the operating system requires at least eight (8) characters be changed between the old and new passwords during a password change by running the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so difok=8 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "difok", or the value is less than "8", this is a finding.

Fix: F-18347r369520_fix

Configure the SUSE operating system to require at least eight characters be changed between the old and new passwords during a password change with the following command: Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "difok=8" after the third column.

b

The SUSE operating system must employ FIPS 140-2 approved cryptographic hashing algorithm for system authentication (login.defs).

IA-7 - Medium - CCI-000803 - V-217122 - SV-217122r646689_rule

RMF Control

IA-7

Severity

M

CCI

Version

SLES-12-010210

Vuln IDs

V-217122
V-77093

Rule IDs

SV-217122r646689_rule
SV-91789

Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied on to provide confidentiality or integrity, and DoD data may be compromised. SUSE operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules. FIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules use authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system.

Checks: C-18350r646687_chk

Verify the SUSE operating system requires that the "ENCRYPT_METHOD" value in "/etc/login.defs" is set to "SHA512". Check the value of "ENCRYPT_METHOD" value in "/etc/login.defs" with the following command: > grep "^ENCRYPT_METHOD " /etc/login.defs ENCRYPT_METHOD SHA512 If "ENCRYPT_METHOD" is not set to "SHA512", if any values other that "SHA512" are configured, or if no output is produced, this is a finding.

Fix: F-18348r646688_fix

Configure the SUSE operating system to require "ENCRYPT_METHOD" of "SHA512". Edit the "/etc/login.defs" file with the following line: ENCRYPT_METHOD SHA512

b

The SUSE operating system must employ FIPS 140-2-approved cryptographic hashing algorithms for all stored passwords.

IA-7 - Medium - CCI-000803 - V-217123 - SV-217123r877397_rule

RMF Control

IA-7

Severity

M

CCI

Version

SLES-12-010220

Vuln IDs

V-217123
V-77099

Rule IDs

SV-217123r877397_rule
SV-91795

The system must use a strong hashing algorithm to store the password. The system must use a sufficient number of hashing rounds to ensure the required level of entropy. Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Satisfies: SRG-OS-000073-GPOS-00041, SRG-OS-000120-GPOS-00061

Checks: C-18351r646690_chk

Verify the SUSE operating system requires the shadow password suite configuration be set to encrypt interactive user passwords using a strong cryptographic hash. Check that the interactive user account passwords are using a strong password hash with the following command: > sudo cut -d: -f2 /etc/shadow $6$kcOnRq/5$NUEYPuyL.wghQwWssXRcLRFiiru7f5JPV6GaJhNC2aK5F3PZpE/BCCtwrxRc/AInKMNX3CdMw11m9STiql12f/ Password hashes "!" or "*" indicate inactive accounts not available for logon and are not evaluated. If any interactive user password hash does not begin with "$6", this is a finding.

Fix: F-18349r646691_fix

Configure the SUSE operating system to encrypt all stored passwords with a strong cryptographic hash. Edit/modify the following line in the "/etc/login.defs" file and set "ENCRYPT_METHOD" to have a value of "SHA512". ENCRYPT_METHOD SHA512 Lock all interactive user accounts not using SHA512 hashing until the passwords can be regenerated.

b

The SUSE operating system must configure the Linux Pluggable Authentication Modules (PAM) to only store encrypted representations of passwords.

IA-5 - Medium - CCI-000196 - V-217124 - SV-217124r877397_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000196

Version

SLES-12-010230

Vuln IDs

V-217124
V-77105

Rule IDs

SV-217124r877397_rule
SV-91801

Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Satisfies: SRG-OS-000120-GPOS-00061

Checks: C-18352r369528_chk

Verify the SUSE operating system configures the Linux PAM to only store encrypted representations of passwords. All account passwords must be hashed with SHA512 encryption strength. Check that PAM is configured to create SHA512 hashed passwords by running the following command: # grep pam_unix.so /etc/pam.d/common-password password required pam_unix.so sha512 If the command does not return anything or the returned line is commented out, has a second column value different from "required", or does not contain "sha512", this is a finding.

Fix: F-18350r369529_fix

Configure the SUSE operating system Linux PAM to only store encrypted representations of passwords. All account passwords must be hashed with SHA512 encryption strength. Edit "/etc/pam.d/common-password" and edit the line containing "pam_unix.so" to contain the SHA512 keyword after third column. Remove the "nullok" option.

b

The SUSE operating system must not be configured to allow blank or null passwords.

CM-6 - Medium - CCI-000366 - V-217125 - SV-217125r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010231

Vuln IDs

V-217125
V-81785

Rule IDs

SV-217125r603262_rule
SV-96499

Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised.

Checks: C-18353r369531_chk

Verify the SUSE operating is not configured to allow blank or null passwords. Check that blank or null passwords cannot be used by running the following command: # grep pam_unix.so /etc/pam.d/* | grep nullok If this produces any output, it may be possible to log on with accounts with empty passwords. If null passwords can be used, this is a finding.

Fix: F-18351r369532_fix

Configure the SUSE operating system to not allow blank or null passwords. Remove any instances of the "nullok" option in "/etc/pam.d/common-auth" and "/etc/pam.d/common-password" to prevent logons with empty passwords.

b

The SUSE operating system must employ FIPS 140-2-approved cryptographic hashing algorithms for all stored passwords.

IA-7 - Medium - CCI-000803 - V-217126 - SV-217126r877397_rule

RMF Control

IA-7

Severity

M

CCI

Version

SLES-12-010240

Vuln IDs

V-217126
V-77107

Rule IDs

SV-217126r877397_rule
SV-91803

The system must use a strong hashing algorithm to store the password. The system must use a sufficient number of hashing rounds to ensure the required level of entropy. Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Satisfies: SRG-OS-000073-GPOS-00041, SRG-OS-000120-GPOS-00061

Checks: C-18354r369534_chk

Verify the SUSE operating system configures the shadow password suite configuration to encrypt passwords using a strong cryptographic hash. Check that a minimum number of hash rounds is configured by running the following command: egrep "^SHA_CRYPT_" /etc/login.defs If only one of "SHA_CRYPT_MIN_ROUNDS" or "SHA_CRYPT_MAX_ROUNDS" is set, and this value is below "5000", this is a finding. If both "SHA_CRYPT_MIN_ROUNDS" and "SHA_CRYPT_MAX_ROUNDS" are set, and the highest value for either is below "5000", this is a finding.

Fix: F-18352r369535_fix

Configure the SUSE operating system to encrypt all stored passwords with a strong cryptographic hash. Edit/modify the following line in the "/etc/login.defs" file and set "SHA_CRYPT_MIN_ROUNDS" to a value no lower than "5000": SHA_CRYPT_MIN_ROUNDS 5000

b

The SUSE operating system must employ passwords with a minimum of 15 characters.

IA-5 - Medium - CCI-000205 - V-217127 - SV-217127r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000205

Version

SLES-12-010250

Vuln IDs

V-217127
V-77109

Rule IDs

SV-217127r603262_rule
SV-91805

The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps determine strength and how long it takes to crack a password. Use of more characters in a password helps exponentially increase the time and/or resources required to compromise the password.

Checks: C-18355r369537_chk

Verify the SUSE operating system enforces a minimum 15-character password length. Check that the operating system enforces a minimum 15-character password length with the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so minlen=15 If the command does not return anything, the returned line is commented out, or has a second column value different from "requisite", or does not contain "minlen" value, or the value is less than "15", this is a finding.

Fix: F-18353r369538_fix

Configure the SUSE operating system to enforce a minimum 15-character password length. Edit "/etc/pam.d/common-password" and edit the line containing "pam_cracklib.so" to contain the option "minlen=15" after the third column. The DoD standard requires a minimum 15-character password length.

b

The SUSE operating system must be configured to create or update passwords with a minimum lifetime of 24 hours (one day).

IA-5 - Medium - CCI-000198 - V-217128 - SV-217128r646695_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000198

Version

SLES-12-010260

Vuln IDs

V-217128
V-77111

Rule IDs

SV-217128r646695_rule
SV-91807

Enforcing a minimum password lifetime helps prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.

Checks: C-18356r646693_chk

Verify the SUSE operating system to create or update passwords with minimum password age of one day or greater. Check that the SUSE operating system enforces 24 hours/one day as the minimum password age, run the following command: > grep '^PASS_MIN_DAYS' /etc/login.defs PASS_MIN_DAYS 1 If no output is produced, or if "PASS_MIN_DAYS" does not have a value of "1" or greater, this is a finding.

Fix: F-18354r646694_fix

Configure the SUSE operating system to enforce 24 hours/one day or greater as the minimum password age. Edit the file "/etc/login.defs" and add or correct the following line. Replace [DAYS] with the appropriate amount of days: PASS_MIN_DAYS [DAYS] The DoD requirement is "1" but a greater value is acceptable.

b

The SUSE operating system must employ user passwords with a minimum lifetime of 24 hours (one day).

IA-5 - Medium - CCI-000198 - V-217129 - SV-217129r646698_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000198

Version

SLES-12-010270

Vuln IDs

V-217129
V-77113

Rule IDs

SV-217129r646698_rule
SV-91809

Enforcing a minimum password lifetime helps prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.

Checks: C-18357r646696_chk

Verify the SUSE operating system enforces a minimum time period between password changes for each user account of one day or greater. Check the minimum time period between password changes for each user account with the following command: > sudo awk -F: '$4 < 1 {print $1 ":" $4}' /etc/shadow smithj:1 If any results are returned that are not associated with a system account, this is a finding.

Fix: F-18355r646697_fix

Configure the SUSE operating system to enforce 24 hours/one day or greater as the minimum password age for user accounts. Change the minimum time period between password changes for each [USER] account to "1" day with the command, replacing [USER] with the user account that must be changed: > sudo passwd -n 1 [USER]

b

The SUSE operating system must be configured to create or update passwords with a maximum lifetime of 60 days.

IA-5 - Medium - CCI-000199 - V-217130 - SV-217130r646701_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000199

Version

SLES-12-010280

Vuln IDs

V-217130
V-77115

Rule IDs

SV-217130r646701_rule
SV-91811

Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the SUSE operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the SUSE operating system passwords could be compromised.

Checks: C-18358r646699_chk

Verify that the SUSE operating system is configured to create or update passwords with a maximum password age of 60 days or less. Check that the SUSE operating system enforces 60 days or less as the maximum password age with the following command: > grep '^PASS_MAX_DAYS' /etc/login.defs The DoD requirement is "60" days or less (greater than zero, as zero days will lock the account immediately). If no output is produced, or if PASS_MAX_DAYS is not set to "60" days or less, this is a finding.

Fix: F-18356r646700_fix

Configure the SUSE operating system to enforce a maximum password age of 60 days or less. Edit the file "/etc/login.defs" and add or correct the following line. Replace [DAYS] with the appropriate amount of days: PASS_MAX_DAYS [DAYS] The DoD requirement is 60 days or less (greater than zero, as zero days will lock the account immediately).

b

The SUSE operating system must employ user passwords with a maximum lifetime of 60 days.

IA-5 - Medium - CCI-000199 - V-217131 - SV-217131r646704_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000199

Version

SLES-12-010290

Vuln IDs

V-217131
V-77117

Rule IDs

SV-217131r646704_rule
SV-91813

Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the SUSE operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the SUSE operating system passwords could be compromised.

Checks: C-18359r646702_chk

Verify that the SUSE operating system enforces a maximum user password age of 60 days or less. Check that the SUSE operating system enforces 60 days or less as the maximum user password age with the following command: > sudo awk -F: '$5 > 60 || $5 == "" {print $1 ":" $5}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding.

Fix: F-18357r646703_fix

Configure the SUSE operating system to enforce a maximum password age of each [USER] account to 60 days. The command in the check text will give a list of users that need to be updated to be in compliance: > sudo passwd -x 60 [USER] The DoD requirement is 60 days.

b

The SUSE operating system must employ a password history file.

IA-5 - Medium - CCI-000200 - V-217132 - SV-217132r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000200

Version

SLES-12-010300

Vuln IDs

V-217132
V-77119

Rule IDs

SV-217132r603262_rule
SV-91815

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.

Checks: C-18360r369552_chk

Verify the password history file exists on the SUSE operating system. Check that the password history file exists with the following command: # ls -al /etc/security/opasswd -rw------- 1 root root 7 Dec 13 17:21 /etc/security/opasswd If "/etc/security/opasswd" does not exist, this is a finding.

Fix: F-18358r369553_fix

Configure the SUSE operating system to create the password history file with the following commands: # sudo touch /etc/security/opasswd # sudo chown root:root /etc/security/opasswd # sudo chmod 0600 /etc/security/opasswd

b

The SUSE operating system must not allow passwords to be reused for a minimum of five (5) generations.

IA-5 - Medium - CCI-000200 - V-217133 - SV-217133r603262_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000200

Version

SLES-12-010310

Vuln IDs

V-217133
V-77121

Rule IDs

SV-217133r603262_rule
SV-91817

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.

Checks: C-18361r369555_chk

Verify the SUSE operating system prohibits the reuse of a password for a minimum of five (5) generations. Check that the SUSE operating system prohibits the reuse of a password for a minimum of five (5) generations with the following command: # grep pam_pwhistory.so /etc/pam.d/common-password password requisite pam_pwhistory.so remember=5 use_authtok If the command does not return a result, or the returned line is commented out, has a second column value different from "requisite", does not contain "remember" value, the value is less than "5", or is missing the "use_authtok" keyword, this is a finding.

Fix: F-18359r369556_fix

Configure the SUSE operating system password history to prohibit the reuse of a password for a minimum of five generations. Edit "/etc/pam.d/common-password" and edit the line containing "pam_pwhistory.so" to contain the option "remember=5 use_authtok" after the third column.

b

The SUSE operating system must prevent the use of dictionary words for passwords.

CM-6 - Medium - CCI-000366 - V-217134 - SV-217134r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010320

Vuln IDs

V-217134
V-77123

Rule IDs

SV-217134r603262_rule
SV-91819

If the SUSE operating system allows the user to select passwords based on dictionary words, this increases the chances of password compromise by increasing the opportunity for successful guesses and brute-force attacks.

Checks: C-18362r369558_chk

Verify the SUSE operating system prevents the use of dictionary words for passwords. Check that the SUSE operating system prevents the use of dictionary words for passwords with the following command: # grep pam_cracklib.so /etc/pam.d/common-password password requisite pam_cracklib.so retry=3 If the command does not return anything, or the returned line is commented out, this is a finding. If the value of "retry" is greater than 3, this is a finding.

Fix: F-18360r369559_fix

Configure the SUSE operating system to prevent the use of dictionary words for passwords. Edit "/etc/pam.d/common-password" and add the following line: password requisite pam_cracklib.so retry=3

b

The SUSE operating system must never automatically remove or disable emergency administrator accounts.

AC-2 - Medium - CCI-001682 - V-217135 - SV-217135r603262_rule

RMF Control

AC-2

Severity

M

CCI

CCI-001682

Version

SLES-12-010330

Vuln IDs

V-217135
V-77125

Rule IDs

SV-217135r603262_rule
SV-91821

Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency accounts are different from infrequently used accounts (i.e., local logon accounts used by the organization's system administrators when network or normal logon/access is not available). Infrequently used accounts are not subject to automatic termination dates. Emergency accounts are accounts created in response to crisis situations, usually for use by maintenance personnel. The automatic expiration or disabling time period may be extended as needed until the crisis is resolved; however, it must not be extended indefinitely. A permanent account should be established for privileged users who need long-term maintenance accounts. To address access requirements the SUSE operating system can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

Checks: C-18363r369561_chk

Verify the SUSE operating system is configured such that emergency administrator accounts are never automatically removed or disabled. Note: Root is typically the "account of last resort" on a system and is also used as the example emergency administrator account. If another account is being used as the emergency administrator account, the command should be used against that account. Check to see if the root account password or account expires with the following command: # sudo chage -l [Emergency_Administrator] Password expires:never If "Password expires" or "Account expires" is set to anything other than "never", this is a finding.

Fix: F-18361r369562_fix

Configure the SUSE operating system to never automatically remove or disable emergency administrator accounts. Replace "[Emergency_Administrator]" in the following command with the correct emergency administrator account. Run the following command as an administrator: # sudo chage -I -1 -M 99999 [Emergency_Administrator]

b

The SUSE operating system must disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity after password expiration.

IA-4 - Medium - CCI-000795 - V-217136 - SV-217136r928528_rule

RMF Control

IA-4

Severity

M

CCI

CCI-000795

Version

SLES-12-010340

Vuln IDs

V-217136
V-77127

Rule IDs

SV-217136r928528_rule
SV-91823

Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained. The SUSE operating system needs to track periods of inactivity and disable application identifiers after 35 days of inactivity.

Checks: C-18364r928526_chk

Verify the SUSE operating system disables account identifiers after 35 days of inactivity since the password expiration Check the account inactivity value by performing the following command: # sudo grep -i inactive /etc/default/useradd INACTIVE=35 If "INACTIVE" is not set to a value greater than "0" and less than or equal to "35", this is a finding.

Fix: F-18362r928527_fix

Configure the SUSE operating system to disable account identifiers after 35 days of inactivity since the password expiration. Run the following command to change the configuration for "useradd" to disable the account identifier after 35 days: # sudo useradd -D -f 35 DOD recommendation is 35 days, but a lower value greater than "0" is acceptable.

b

The SUSE operating system must enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

CM-6 - Medium - CCI-000366 - V-217138 - SV-217138r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010370

Vuln IDs

V-217138
V-77131

Rule IDs

SV-217138r603262_rule
SV-91827

Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account.

Checks: C-18366r369570_chk

Verify the SUSE operating system enforces a delay of at least four seconds between logon prompts following a failed logon attempt. # grep pam_faildelay /etc/pam.d/common-auth* auth required pam_faildelay.so delay=4000000 If the value of "delay" is not set to "4000000" or greater, "delay" is commented out, "delay" is missing, or the "pam_faildelay" line is missing completely, this is a finding.

Fix: F-18364r369571_fix

Configure the SUSE operating system to enforce a delay of at least four seconds between logon prompts following a failed logon attempt. Edit the file "/etc/pam.d/common-auth". Add a parameter "pam_faildelay" and set it to a value of "4000000" or greater: # delay is in micro seconds auth required pam_faildelay.so delay=4000000

c

The SUSE operating system must not allow unattended or automatic logon via the graphical user interface.

CM-6 - High - CCI-000366 - V-217139 - SV-217139r877377_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010380

Vuln IDs

V-217139
V-77133

Rule IDs

SV-217139r877377_rule
SV-91829

Failure to restrict system access to authenticated users negatively impacts SUSE operating system security.

Checks: C-18367r646705_chk

Note: If a graphical user interface is not installed, this requirement is Not Applicable. Verify the SUSE operating system does not allow unattended or automatic logon via a graphical user interface. Check that unattended or automatic login is disabled with the following commands: > grep -i ^DISPLAYMANAGER_AUTOLOGIN /etc/sysconfig/displaymanager DISPLAYMANAGER_AUTOLOGIN="" > grep -i ^DISPLAYMANAGER_PASSWORD_LESS_LOGIN /etc/sysconfig/displaymanager DISPLAYMANAGER_PASSWORD_LESS_LOGIN="no" If the "DISPLAYMANAGER_AUTOLOGIN" parameter includes a username or the "DISPLAYMANAGER_PASSWORD_LESS_LOGIN" parameter is not set to "no", this is a finding.

Fix: F-18365r646706_fix

Note: If a graphical user interface is not installed, this requirement is Not Applicable. Configure the SUSE operating system graphical user interface to not allow unattended or automatic logon to the system. Add or edit the following lines in the "/etc/sysconfig/displaymanager" configuration file: DISPLAYMANAGER_AUTOLOGIN="" DISPLAYMANAGER_PASSWORD_LESS_LOGIN="no"

a

The SUSE operating system must display the date and time of the last successful account logon upon logon.

AC-9 - Low - CCI-000052 - V-217140 - SV-217140r858540_rule

RMF Control

AC-9

Severity

L

CCI

CCI-000052

Version

SLES-12-010390

Vuln IDs

V-217140
V-77135

Rule IDs

SV-217140r858540_rule
SV-91831

Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.

Checks: C-18368r646708_chk

Verify the SUSE operating system users are provided with feedback on when account accesses last occurred. Check that "pam_lastlog" is used and not silent with the following command: > grep pam_lastlog /etc/pam.d/login session required pam_lastlog.so showfailed If "pam_lastlog" is missing from "/etc/pam.d/login" file, the "silent" option is present, or the returned line is commented out, this is a finding.

Fix: F-18366r369577_fix

Configure the SUSE operating system to provide users with feedback on when account accesses last occurred by setting the required configuration options in "/etc/pam.d/login". Add the following line to the top of "/etc/pam.d/login": session required pam_lastlog.so showfailed

c

There must be no .shosts files on the SUSE operating system.

CM-6 - High - CCI-000366 - V-217141 - SV-217141r603262_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010400

Vuln IDs

V-217141
V-77137

Rule IDs

SV-217141r603262_rule
SV-91833

The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.

Checks: C-18369r369579_chk

Verify there are no ".shosts" files on the SUSE operating system. Check the system for the existence of these files with the following command: # find / -name '.shosts' If any ".shosts" files are found on the system, this is a finding.

Fix: F-18367r369580_fix

Remove any ".shosts" files found on the SUSE operating system. # rm /[path]/[to]/[file]/.shosts

c

There must be no shosts.equiv files on the SUSE operating system.

CM-6 - High - CCI-000366 - V-217142 - SV-217142r603262_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010410

Vuln IDs

V-217142
V-77139

Rule IDs

SV-217142r603262_rule
SV-91835

The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.

Checks: C-18370r369582_chk

Verify there are no "shosts.equiv" files on the SUSE operating system. Check the system for the existence of these files with the following command: # find /etc -name shosts.equiv If any "shosts.equiv" files are found on the system, this is a finding.

Fix: F-18368r369583_fix

Remove any "shosts.equiv" files found on the SUSE operating system. # rm /[path]/[to]/[file]/shosts.equiv

b

FIPS 140-2 mode must be enabled on the SUSE operating system.

SC-13 - Medium - CCI-002450 - V-217143 - SV-217143r877466_rule

RMF Control

SC-13

Severity

M

CCI

CCI-002450

Version

SLES-12-010420

Vuln IDs

V-217143
V-77141

Rule IDs

SV-217143r877466_rule
SV-91837

Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The SUSE operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Satisfies: SRG-OS-000396-GPOS-00176, SRG-OS-000478-GPOS-00223

Checks: C-18371r369585_chk

Verify the SUSE operating system is running in FIPS mode by running the following command. # cat /proc/sys/crypto/fips_enabled 1 If nothing is returned, the file does not exist, or the value returned is "0", this is a finding.

Fix: F-18369r369586_fix

To configure the SUSE operating system to run in FIPS mode, add "fips=1" to the kernel parameter during the SUSE operating system install. Enabling FIPS mode on a preexisting system involves a number of modifications to the SUSE operating system. Refer to section 9.1, "Crypto Officer Guidance", of the following document for installation guidance: http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/140sp/140sp2435.pdf

b

SUSE operating systems with a basic input/output system (BIOS) must require authentication upon booting into single-user and maintenance modes.

AC-3 - Medium - CCI-000213 - V-217144 - SV-217144r603262_rule

RMF Control

AC-3

Severity

M

CCI

CCI-000213

Version

SLES-12-010430

Vuln IDs

V-217144
V-77143

Rule IDs

SV-217144r603262_rule
SV-91839

To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access. Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement. Access control policies include identity-based policies, role-based policies, and attribute-based policies. Access enforcement mechanisms include access control lists, access control matrices, and cryptography. These policies and mechanisms must be employed by the application to control access between users (or processes acting on behalf of users) and objects (e.g., devices, files, records, processes, programs, and domains) in the information system.

Checks: C-18372r369588_chk

Verify that the SUSE operating system has set an encrypted root password. Note: If the system does not use a basic input/output system (BIOS) this requirement is Not Applicable. Check that the encrypted password is set for a boot user with the following command: # sudo cat /boot/grub2/grub.cfg | grep -i password password_pbkdf2 boot grub.pbkdf2.sha512.10000.VeryLongString If the boot user password entry does not begin with "password_pbkdf2", this is a finding.

Fix: F-18370r369589_fix

Note: If the system does not use a basic input/output system (BIOS) this requirement is Not Applicable. Configure the SUSE operating system to encrypt the boot password. Generate an encrypted (GRUB2) password for root with the following command: # sudo grub2-mkpasswd-pbkdf2 Enter Password: Reenter Password: PBKDF2 hash of your password is grub.pbkdf2.sha512.10000.MFU48934NJD84NF8NSD39993JDHF84NG Using the hash from the output, modify the "/etc/grub.d/40_custom" file with the following command to add a password for the boot user entry: # cat << EOF set superusers="boot" password_pbkdf2 boot grub.pbkdf2.sha512.VeryLongString EOF Generate an updated "grub.conf" file with the new password using the following commands: # sudo grub2-mkconfig --output=/tmp/grub2.cfg # sudo mv /tmp/grub2.cfg /boot/grub2/grub.cfg

b

SUSE operating systems with Unified Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance.

AC-3 - Medium - CCI-000213 - V-217145 - SV-217145r603262_rule

RMF Control

AC-3

Severity

M

CCI

CCI-000213

Version

SLES-12-010440

Vuln IDs

V-217145
V-77145

Rule IDs

SV-217145r603262_rule
SV-91841

If the system allows a user to boot into single-user or maintenance mode without authentication, any user that invokes single-user or maintenance mode is granted privileged access to all system information. If the system is running in EFI mode, SLES 12 by default will use GRUB 2 EFI as the boot loader.

Checks: C-18373r369591_chk

Verify that the SUSE operating system has set an encrypted boot password. Note: If the system does not use Unified Extensible Firmware Interface (UEFI) this requirement is Not Applicable. Check that the encrypted password is set for a boot user with the following command: # sudo cat /boot/efi/EFI/sles/grub.cfg | grep -i password password_pbkdf2 boot grub.pbkdf2.sha512.10000.VeryLongString If the boot user password entry does not begin with "password_pbkdf2", this is a finding.

Fix: F-18371r369592_fix

Note: If the system does not use UEFI, this requirement is Not Applicable. Configure the SUSE operating system to encrypt the boot password. Generate an encrypted (GRUB 2) password for a boot user with the following command: # sudo grub2-mkpasswd-pbkdf2 Enter Password: Reenter Password: PBKDF2 hash of your password is grub.pbkdf2.sha512.10000.MFU48934NJD84NF8NSD39993JDHF84NG Using the hash from the output, modify the "/etc/grub.d/40_custom" file with the following command to add a boot password for the root entry: # cat << EOF set superusers="boot" password_pbkdf2 boot grub.pbkdf2.sha512.VeryLongString EOF Generate an updated "grub.conf" file with the new password using the following commands: # sudo grub2-mkconfig --output=/tmp/grub2.cfg # sudo mv /tmp/grub2.cfg /boot/efi/EFI/sles/grub.cfg

b

All SUSE operating system persistent disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at rest protection.

SC-28 - Medium - CCI-001199 - V-217146 - SV-217146r854086_rule

RMF Control

SC-28

Severity

M

CCI

CCI-001199

Version

SLES-12-010450

Vuln IDs

V-217146
V-77147

Rule IDs

SV-217146r854086_rule
SV-91843

SUSE operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest. Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields). Satisfies: SRG-OS-000185-GPOS-00079, SRG-OS-000404-GPOS-00183, SRG-OS-000405-GPOS-00184

Checks: C-18374r369594_chk

Verify the SUSE operating system prevents unauthorized disclosure or modification of all information requiring at rest protection by using disk encryption. Determine the partition layout for the system with the following command: # sudo fdisk -l Device Boot Start End Sectors Size Id Type /dev/sda1 2048 4208639 4206592 2G 82 Linux swap / Solaris /dev/sda2 * 4208640 53479423 49270784 23.5G 83 Linux /dev/sda3 53479424 125829119 72349696 34.5G 83 Linux Verify the system partitions are all encrypted with the following command: # sudo more /etc/crypttab luks UUID=114167a-2a94-6cda-f1e7-15ad146c258b swap /dev/sda1 /dev/urandom swap truecrypt /dev/sda2 /etc/container_password tcrypt truecrypt /dev/sda3 /etc/container_password tcrypt Every persistent disk partition present on the system must have an entry in the file. If any partitions other than pseudo file systems (such as /proc or /sys) are not listed or "/etc/crypttab" does not exist, this is a finding.

Fix: F-18372r369595_fix

Configure the SUSE operating system to prevent unauthorized modification of all information at rest by using disk encryption. Encrypting a partition in an already-installed system is more difficult because of the need to resize and change existing partitions. To encrypt an entire partition, dedicate a partition for encryption in the partition layout. The standard partitioning proposal as suggested by YaST (installation and configuration tool for Linux) does not include an encrypted partition by default. Add it manually in the partitioning dialog. Refer to the document "SUSE 12 Security Guide", Section 11.1, for a detailed disk encryption guide: https://www.suse.com/documentation/sles-12/book_security/data/sec_security_cryptofs_y2.html#sec_security_cryptofs_y2_part_run

b

The sticky bit must be set on all SUSE operating system world-writable directories.

SC-4 - Medium - CCI-001090 - V-217147 - SV-217147r603262_rule

RMF Control

SC-4

Severity

M

CCI

CCI-001090

Version

SLES-12-010460

Vuln IDs

V-217147
V-77149

Rule IDs

SV-217147r603262_rule
SV-91845

Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, and hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection. This requirement generally applies to the design of an information technology product, but it can also apply to the configuration of particular information system components that are, or use, such products. This can be verified by acceptance/validation processes in DoD or other government agencies. There may be shared resources with configurable protections (e.g., files in storage) that may be assessed on specific information system components.

Checks: C-18375r369597_chk

Verify the SUSE operating system prevents unauthorized and unintended information transfer via the shared system resources. Note: The example below should be repeated for each locally defined partition. Check that world-writable directories have the sticky bit set with the following command: # sudo find / -xdev -perm -002 -type d -fstype xfs -exec ls -lLd {} \; 256 0 drwxrwxrwt 1 root root 4096 Jun 14 06:45 /tmp If any of the returned directories do not have the sticky bit set, or are not documented as having the write permission for the other class, this is a finding.

Fix: F-18373r369598_fix

Configure the SUSE operating system shared system resources to prevent any unauthorized and unintended information transfer by setting the sticky bit for all world-writable directories. An example of a world-writable directory is "/tmp" directory. Set the sticky bit on all of the world-writable directories (using the "/tmp" directory as an example) with the following command: # sudo chmod 1777 /tmp For every world-writable directory, replace "/tmp" in the command above with the world-writable directory that does not have the sticky bit set.

b

Advanced Intrusion Detection Environment (AIDE) must verify the baseline SUSE operating system configuration at least weekly.

SI-6 - Medium - CCI-002696 - V-217148 - SV-217148r902840_rule

RMF Control

SI-6

Severity

M

CCI

CCI-002696

Version

SLES-12-010500

Vuln IDs

V-217148
V-77151

Rule IDs

SV-217148r902840_rule
SV-91847

Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the SUSE operating system. Changes to SUSE operating system configurations can have unintended side effects, some of which may be relevant to security. Detecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the SUSE operating system. The SUSE operating system's Information System Security Manager (ISSM)/Information System Security Officer (ISSO) and System Administrator (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.

Checks: C-18376r902838_chk

Verify the SUSE operating system checks the baseline configuration for unauthorized changes at least once weekly. Note: A file integrity tool other than Advanced Intrusion Detection Environment (AIDE) may be used, but the tool must be executed at least once per week. Check for a "crontab" that controls the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command: # sudo crontab -l 0 0 * * 6 /usr/bin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil If the file integrity application does not exist, or a "crontab" entry does not exist, check the cron directories for a script that runs the file integrity application: # ls -al /etc/cron.daily /etc/cron.weekly Inspect the file and ensure that the file integrity tool is being executed. If a file integrity tool is not configured in the crontab or in a script that runs at least weekly, this is a finding.

Fix: F-18374r902839_fix

Configure the SUSE operating system to check the baseline configuration for unauthorized changes at least once weekly. Configure the file integrity tool to automatically run on the system at least weekly. The following example output is generic. It will set cron to run AIDE weekly, but other file integrity tools may be used: # sudo crontab -l 0 0 * * 6 /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil Note: Per requirement SLES-12-010498, the "mailx" package must be installed on the system to enable email functionality.

b

The SUSE operating system must notify the System Administrator (SA) when AIDE discovers anomalies in the operation of any security functions.

SI-6 - Medium - CCI-002702 - V-217149 - SV-217149r902843_rule

RMF Control

SI-6

Severity

M

CCI

CCI-002702

Version

SLES-12-010510

Vuln IDs

V-217149
V-77153

Rule IDs

SV-217149r902843_rule
SV-91849

If anomalies are not acted on, security functions may fail to secure the system. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. Notifications provided by information systems include messages to local computer consoles and/or hardware indications, such as lights. This capability must take into account operational requirements for availability for selecting an appropriate response. The organization may choose to shut down or restart the information system upon security function anomaly detection.

Checks: C-18377r902841_chk

Verify the SUSE operating system notifies the SA when AIDE discovers anomalies in the operation of any security functions. Check to see if the aide cron job sends an email when executed with the following command: # sudo crontab -l 0 0 * * 6 /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil If a "crontab" entry does not exist, check the cron directories for a script that runs the file integrity application and is configured to execute a binary to send an email: # ls -al /etc/cron.daily /etc/cron.weekly If a cron job is not configured to execute a binary to send an email (such as "/bin/mail"), this is a finding.

Fix: F-18375r902842_fix

Configure the SUSE operating system to notify the SA when AIDE discovers anomalies in the operation of any security functions. Add following command to a cron job replacing the "[E-MAIL]" parameter with a proper email address for the SA: /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil Note: Per requirement SLES-12-010498, the "mailx" package must be installed on the system to enable email functionality.

a

The SUSE operating system file integrity tool must be configured to verify Access Control Lists (ACLs).

CM-6 - Low - CCI-000366 - V-217150 - SV-217150r880939_rule

RMF Control

CM-6

Severity

L

CCI

Version

SLES-12-010520

Vuln IDs

V-217150
V-77155

Rule IDs

SV-217150r880939_rule
SV-91851

ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools.

Checks: C-18378r880938_chk

Verify that the SUSE operating system file integrity tool is configured to verify ACLs. Check the "aide.conf" file to determine if the "acl" rule has been added to the rule list being applied to the files and directories selection lists. An example rule that includes the "acl" rule follows: All= p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "acl" rule is not being used on all selection lines in the "/etc/aide.conf" file, or ACLs are not being checked by another file integrity tool, this is a finding.

Fix: F-18376r369607_fix

Configure the SUSE operating system file integrity tool to check file and directory ACLs. If AIDE is installed, ensure the "acl" rule is present on all file and directory selection lists.

a

The SUSE operating system file integrity tool must be configured to verify extended attributes.

CM-6 - Low - CCI-000366 - V-217151 - SV-217151r880941_rule

RMF Control

CM-6

Severity

L

CCI

Version

SLES-12-010530

Vuln IDs

V-217151
V-77157

Rule IDs

SV-217151r880941_rule
SV-91853

Extended attributes in file systems are used to contain arbitrary data and file metadata with security implications.

Checks: C-18379r880940_chk

Verify that the SUSE operating system file integrity tool is configured to verify extended attributes. Check the "aide.conf" file to determine if the "xattrs" rule has been added to the rule list being applied to the files and directories selection lists. An example rule that includes the "xattrs" rule follows: All= p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux /bin All # apply the custom rule to the files in bin /sbin All # apply the same custom rule to the files in sbin If the "xattrs" rule is not being used on all selection lines in the "/etc/aide.conf" file, or extended attributes are not being checked by another file integrity tool, this is a finding.

Fix: F-18377r369610_fix

Configure the SUSE operating system file integrity tool to check file and directory extended attributes. If AIDE is installed, ensure the "xattrs" rule is present on all file and directory selection lists.

b

The SUSE operating system file integrity tool must be configured to protect the integrity of the audit tools.

AU-9 - Medium - CCI-001496 - V-217152 - SV-217152r877393_rule

RMF Control

AU-9

Severity

M

CCI

CCI-001496

Version

SLES-12-010540

Vuln IDs

V-217152
V-77159

Rule IDs

SV-217152r877393_rule
SV-91855

Protecting the integrity of the tools used for auditing purposes is a critical step toward ensuring the integrity of audit information. Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity. Audit tools include but are not limited to vendor-provided and open-source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators. It is not uncommon for attackers to replace the audit tools or inject code into the existing tools to provide the capability to hide or erase system activity from the audit logs. To address this risk, audit tools must be cryptographically signed to provide the capability to identify when the audit tools have been modified, manipulated, or replaced. An example is a checksum hash of the file or files.

Checks: C-18380r369612_chk

Verify that the SUSE operating system file integrity tool is configured to protect the integrity of the audit tools. Check that AIDE is properly configured to protect the integrity of the audit tools by running the following command: # sudo cat /etc/aide.conf | grep /usr/sbin/au /usr/sbin/auditctl p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/auditd p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/ausearch p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/aureport p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/autrace p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/audispd p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/augenrules p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 If AIDE is configured properly to protect the integrity of the audit tools, all lines listed above will be returned from the command. If one or more lines are missing, this is a finding.

Fix: F-18378r369613_fix

Configure the SUSE operating system file integrity tool to protect the integrity of the audit tools. Add or update the following lines to "/etc/aide.conf" to protect the integrity of the audit tools: # audit tools /usr/sbin/auditctl p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/auditd p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/ausearch p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/aureport p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/autrace p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/audispd p+i+n+u+g+s+b+acl+selinux+xattrs+sha512 /usr/sbin/augenrules p+i+n+u+g+s+b+acl+selinux+xattrs+sha512

b

The SUSE operating system tool zypper must have gpgcheck enabled.

CM-5 - Medium - CCI-001749 - V-217153 - SV-217153r877463_rule

RMF Control

CM-5

Severity

M

CCI

CCI-001749

Version

SLES-12-010550

Vuln IDs

V-217153
V-77161

Rule IDs

SV-217153r877463_rule
SV-91857

Changes to any software components can have significant effects on the overall security of the SUSE operating system. This requirement ensures the software has not been tampered with and has been provided by a trusted vendor. Accordingly, patches, service packs, device drivers, or SUSE operating system components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The SUSE operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved Certification Authority (CA).

Checks: C-18381r646714_chk

Verify that the SUSE operating system tool zypper has gpgcheck enabled. Check that zypper has gpgcheck enabled with the following command: > grep -i '^gpgcheck' /etc/zypp/zypp.conf gpgcheck = 1 If "gpgcheck" is set to "0", "off", "no", or "false", this is a finding.

Fix: F-18379r646715_fix

Configure that the SUSE operating system tool zypper to enable gpgcheck by editing or adding the following line to "/etc/zypp/zypp.conf": gpgcheck = 1

b

The SUSE operating system must remove all outdated software components after updated versions have been installed.

SI-2 - Medium - CCI-002617 - V-217154 - SV-217154r854090_rule

RMF Control

SI-2

Severity

M

CCI

CCI-002617

Version

SLES-12-010570

Vuln IDs

V-217154
V-77163

Rule IDs

SV-217154r854090_rule
SV-91859

Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.

Checks: C-18382r369618_chk

Verify the SUSE operating system removes all outdated software components after updated version have been installed by running the following command: # grep -i upgraderemovedroppedpackages /etc/zypp/zypp.conf solver.upgradeRemoveDroppedPackages = true If "solver.upgradeRemoveDroppedPackages" is commented out, is set to "false", or is missing completely, this is a finding.

Fix: F-18380r369619_fix

Configure the SUSE operating system to remove all outdated software components after an update by editing the following line in "/etc/zypp/zypp.conf" to match the one provided below: solver.upgradeRemoveDroppedPackages = true

b

The SUSE operating system must disable the USB mass storage kernel module.

IA-3 - Medium - CCI-001958 - V-217155 - SV-217155r854091_rule

RMF Control

IA-3

Severity

M

CCI

CCI-001958

Version

SLES-12-010580

Vuln IDs

V-217155
V-77165

Rule IDs

SV-217155r854091_rule
SV-91861

Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Peripherals include but are not limited to such devices as flash drives, external storage, and printers.

Checks: C-18383r369621_chk

Verify the SUSE operating system does not automount USB mass storage devices when connected to the host. Check that "usb-storage" is blacklisted in the "/etc/modprobe.d/50-blacklist.conf" file with the following command: # grep usb-storage /etc/modprobe.d/50-blacklist.conf blacklist usb-storage If nothing is output from the command, this is a finding.

Fix: F-18381r369622_fix

Configure the SUSE operating system to prevent USB mass storage devices from automounting when connected to the host. Add or update the following line to the "/etc/modprobe.d/50-blacklist.conf" file: blacklist usb-storage

b

The SUSE operating system must disable the file system automounter unless required.

CM-6 - Medium - CCI-000366 - V-217156 - SV-217156r854092_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010590

Vuln IDs

V-217156
V-77167

Rule IDs

SV-217156r854092_rule
SV-91863

Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227

Checks: C-18384r369624_chk

Verify the SUSE operating system disables the ability to automount devices. Check to see if automounter service is active with the following command: # systemctl status autofs autofs.service - Automounts filesystems on demand Loaded: loaded (/usr/lib/systemd/system/autofs.service; disabled) Active: inactive (dead) If the "autofs" status is set to "active" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix: F-18382r369625_fix

Configure the SUSE operating system to disable the ability to automount devices. Turn off the automount service with the following command: # systemctl stop autofs # systemctl disable autofs If "autofs" is required for Network File System (NFS), it must be documented with the ISSO.

b

The SUSE operating system Apparmor tool must be configured to control whitelisted applications and user home directory access control.

CM-7 - Medium - CCI-001774 - V-217158 - SV-217158r854093_rule

RMF Control

CM-7

Severity

M

CCI

CCI-001774

Version

SLES-12-010600

Vuln IDs

V-217158
V-77169

Rule IDs

SV-217158r854093_rule
SV-91865

Using a whitelist provides a configuration management method for allowing the execution of only authorized software. Using only authorized software decreases risk by limiting the number of potential vulnerabilities. The organization must identify authorized software programs and permit execution of authorized software by adding each authorized program to the "pam_apparmor" exception policy. The process used to identify software programs that are authorized to execute on organizational information systems is commonly referred to as whitelisting. Verification of whitelisted software occurs prior to execution or at system startup. Users' home directories/folders may contain information of a sensitive nature. Nonprivileged users should coordinate any sharing of information with a System Administrator (SA) through shared resources. Apparmor can confine users to their home directory, not allowing them to make any changes outside of their own home directories. Confining users to their home directory will minimize the risk of sharing information. Satisfies: SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123SRG-OS-000312-GPOS-00124, SRG-OS-000324-GPOS-00125, SRG-OS-000326-GPOS-00126, SRG-OS-000370-GPOS-00155, SRG-OS-000480-GPOS-00230

Checks: C-18386r646717_chk

Verify that the SUSE operating system Apparmor tool is configured to control whitelisted applications and user home directory access control. Check that "pam_apparmor" is installed on the system with the following command: > zypper info pam_apparmor | grep "Installed" If the package "pam_apparmor" is not installed on the system, this is a finding. Check that the "apparmor" daemon is running with the following command: > systemctl status apparmor.service | grep -i active Active: active (exited) since Fri 2017-01-13 01:01:01 GMT; 1day 1h ago If something other than "Active: active" is returned, this is a finding. Note: "pam_apparmor" must have properly configured profiles. All configurations will be based on the actual system setup and organization. See the "pam_apparmor" documentation for more information on configuring profiles.

Fix: F-18384r646718_fix

Configure the SUSE operating system to blacklist all applications by default and permit by whitelist. Install "pam_apparmor" (if it is not installed) with the following command: > sudo zypper in pam_apparmor Enable/activate "Apparmor" (if it is not already active) with the following command: > sudo systemctl enable apparmor.service Start "Apparmor" with the following command: > sudo systemctl start apparmor.service Note: "pam_apparmor" must have properly configured profiles. All configurations will be based on the actual system setup and organization. See the "pam_apparmor" documentation for more information on configuring profiles.

c

The SUSE operating system must disable the x86 Ctrl-Alt-Delete key sequence.

CM-6 - High - CCI-000366 - V-217159 - SV-217159r646722_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010610

Vuln IDs

V-217159
V-77171

Rule IDs

SV-217159r646722_rule
SV-91867

A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot.

Checks: C-18387r646720_chk

Verify the SUSE operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed. Check that the ctrl-alt-del.target is masked with the following command: > systemctl status ctrl-alt-del.target Loaded: masked (/dev/null; masked) Active: inactive (dead) If the ctrl-alt-del.target is not masked, this is a finding.

Fix: F-18385r646721_fix

Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following commands: > sudo systemctl disable ctrl-alt-del.target > sudo systemctl mask ctrl-alt-del.target And reload the daemon to take effect > sudo systemctl daemon-reload

c

The SUSE operating system must disable the x86 Ctrl-Alt-Delete key sequence for Graphical User Interfaces.

CM-6 - High - CCI-000366 - V-217160 - SV-217160r646725_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010611

Vuln IDs

V-217160
V-98987

Rule IDs

SV-217160r646725_rule
SV-108091

A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the GNOME graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.

Checks: C-18388r646723_chk

Note: If a graphical user interface is not installed, this requirement is Not Applicable. Verify the SUSE operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed in the graphical user interface. Check that the dconf setting was disabled to allow the Ctrl-Alt-Delete sequence in the graphical user interface with the following command: Check the default logout key sequence: > sudo gsettings get org.gnome.settings-daemon.plugins.media-keys logout '' Check that the value is not writable and cannot be changed by the user: > sudo gsettings writable org.gnome.settings-daemon.plugins.media-keys logout false If the logout value is not [''] and the writable status is not false, this is a finding.

Fix: F-18386r646724_fix

Configure the system to disable the Ctrl-Alt-Delete sequence for the graphical user interface. Create a database to contain the system-wide setting (if it does not already exist) with the following steps: 1. Create a user profile and with the listed content: /etc/dconf/profile/user user-db:user system-db:local 2. Create the following directories: > sudo mkdir -p /etc/dconf/db/local.d/ > sudo mkdir -p /etc/dconf/db/local.d/locks/ 3. Add the following files with the listed content: /etc/dconf/db/local.d/01-fips-settings [org/gnome/settings-daemon/plugins/media-keys] logout='' /etc/dconf/db/local.d/locks/01-fips-locks /org/gnome/settings-daemon/plugins/media-keys/logout 4. Update the dconf database: > sudo dconf update

b

The SUSE operating system default permissions must be defined in such a way that all authenticated users can only read and modify their own files.

CM-6 - Medium - CCI-000366 - V-217161 - SV-217161r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010620

Vuln IDs

V-217161
V-77173

Rule IDs

SV-217161r603262_rule
SV-91869

Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.

Checks: C-18389r369639_chk

Verify the SUSE operating system defines default permissions for all authenticated users in such a way that the users can only read and modify their own files. Check the system default permissions with the following command: # grep -i "umask" /etc/login.defs UMASK 077 If the "UMASK" variable is set to "000", the severity is raised to a CAT I, and this is a finding. If the value of "UMASK" is not set to "077", "UMASK" is commented out, or "UMASK" is missing completely, this is a finding.

Fix: F-18387r369640_fix

Configure the SUSE operating system to define the default permissions for all authenticated users in such a way that the users can only read and modify their own files. Add or edit the "UMASK" parameter in the "/etc/login.defs" file to match the example below: UMASK 077

b

The SUSE operating system must not have unnecessary accounts.

CM-6 - Medium - CCI-000366 - V-217162 - SV-217162r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010630

Vuln IDs

V-217162
V-77175

Rule IDs

SV-217162r603262_rule
SV-91871

Accounts providing no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system and application accounts for applications not installed on the system.

Checks: C-18390r369642_chk

Verify all SUSE operating system accounts are assigned to an active system, application, or user account. Obtain the list of authorized system accounts from the Information System Security Officer (ISSO). Check the system accounts on the system with the following command: # more /etc/passwd root:x:0:0:root:/root:/bin/bash ... games:x:12:100:Games account:/var/games:/bin/bash Accounts such as "games" and "gopher" are not authorized accounts as they do not support authorized system functions. If the accounts on the system do not match the provided documentation, this is a finding.

Fix: F-18388r369643_fix

Configure the SUSE operating system so all accounts on the system are assigned to an active system, application, or user account. Remove accounts that do not support approved system activities or that allow for a normal user to perform administrative-level actions. Document all authorized accounts on the system.

b

The SUSE operating system must not have duplicate User IDs (UIDs) for interactive users.

IA-2 - Medium - CCI-000764 - V-217163 - SV-217163r603262_rule

RMF Control

IA-2

Severity

M

CCI

CCI-000764

Version

SLES-12-010640

Vuln IDs

V-217163
V-77177

Rule IDs

SV-217163r603262_rule
SV-91873

To assure accountability and prevent unauthenticated access, interactive users must be identified and authenticated to prevent potential misuse and compromise of the system. Interactive users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Interactive users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following: 1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and 2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062

Checks: C-18391r369645_chk

Verify the SUSE operating system contains no duplicate UIDs for interactive users. Check that the SUSE operating system contains no duplicate UIDs for interactive users by running the following command: # awk -F ":" 'list[$3]++{print $1, $3}' /etc/passwd If output is produced, this is a finding.

Fix: F-18389r369646_fix

Configure the SUSE operating system to contain no duplicate UIDs for interactive users. Edit the file "/etc/passwd" and provide each interactive user account that has a duplicate UID with a unique UID.

c

The SUSE operating system root account must be the only account having unrestricted access to the system.

CM-6 - High - CCI-000366 - V-217164 - SV-217164r603262_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010650

Vuln IDs

V-217164
V-77179

Rule IDs

SV-217164r603262_rule
SV-91875

If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricted access to the entire SUSE operating system. Multiple accounts with a UID of "0" afford an opportunity for potential intruders to guess a password for a privileged account.

Checks: C-18392r369648_chk

Verify that the SUSE operating system root account is the only account with unrestricted access to the system. Check the system for duplicate UID "0" assignments with the following command: # awk -F: '$3 == 0 {print $1}' /etc/passwd root If any accounts other than root have a UID of "0", this is a finding.

Fix: F-18390r369649_fix

Change the UID of any account on the SUSE operating system, other than the root account, that has a UID of "0". If the account is associated with system commands or applications, the UID should be changed to one greater than "0" but less than "1000". Otherwise, assign a UID of greater than "1000" that has not already been assigned.

b

If Network Security Services (NSS) is being used by the SUSE operating system it must prohibit the use of cached authentications after one day.

IA-5 - Medium - CCI-002007 - V-217166 - SV-217166r854094_rule

RMF Control

IA-5

Severity

M

CCI

CCI-002007

Version

SLES-12-010670

Vuln IDs

V-217166
V-77183

Rule IDs

SV-217166r854094_rule
SV-91879

If cached authentication information is out of date, the validity of the authentication information may be questionable.

Checks: C-18394r369654_chk

If NSS is not used on the operating system, this is Not Applicable. If NSS is used by the SUSE operating system, verify it prohibits the use of cached authentications after one day. Check that cached authentications cannot be used after one day with the following command: # sudo grep -i "memcache_timeout" /etc/sssd/sssd.conf memcache_timeout = 86400 If "memcache_timeout" has a value greater than "86400", or is missing, this is a finding.

Fix: F-18392r369655_fix

Configure NSS, if used by the SUSE operating system, to prohibit the use of cached authentications after one day. Add or change the following line in "/etc/sssd/sssd.conf" just below the line "[nss]": memcache_timeout = 86400

b

The SUSE operating system must configure the Linux Pluggable Authentication Modules (PAM) to prohibit the use of cached offline authentications after one day.

IA-5 - Medium - CCI-002007 - V-217167 - SV-217167r854095_rule

RMF Control

IA-5

Severity

M

CCI

CCI-002007

Version

SLES-12-010680

Vuln IDs

V-217167
V-77185

Rule IDs

SV-217167r854095_rule
SV-91881

If cached authentication information is out of date, the validity of the authentication information may be questionable.

Checks: C-18395r369657_chk

If SSSD is not being used on the operating system, this is Not Applicable. Verify that the SUSE operating system Pluggable Authentication Modules (PAM) prohibits the use of cached off line authentications after one day. Check that cached off line authentications cannot be used after one day with the following command: # sudo grep "offline_credentials_expiration" /etc/sssd/sssd.conf offline_credentials_expiration = 1 If "offline_credentials_expiration" is not set to a value of "1", this is a finding.

Fix: F-18393r369658_fix

Configure the SUSE operating system PAM to prohibit the use of cached authentications after one day. Add or change the following line in "/etc/sssd/sssd.conf" just below the line "[pam]": offline_credentials_expiration = 1

b

All SUSE operating system files and directories must have a valid owner.

AC-3 - Medium - CCI-002165 - V-217168 - SV-217168r854096_rule

RMF Control

AC-3

Severity

M

CCI

CCI-002165

Version

SLES-12-010690

Vuln IDs

V-217168
V-77187

Rule IDs

SV-217168r854096_rule
SV-91883

Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier (UID) as the UID of the unowned files.

Checks: C-18396r369660_chk

Verify that all SUSE operating system files and directories on the system have a valid owner. Check the owner of all files and directories with the following command: Note: The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -fstype xfs -nouser If any files on the system do not have an assigned owner, this is a finding.

Fix: F-18394r369661_fix

Either remove all files and directories from the SUSE operating system that do not have a valid user, or assign a valid user to all unowned files and directories on the system with the "chown" command: # sudo chown <user> <file>

b

All SUSE operating system files and directories must have a valid group owner.

AC-3 - Medium - CCI-002165 - V-217169 - SV-217169r854097_rule

RMF Control

AC-3

Severity

M

CCI

CCI-002165

Version

SLES-12-010700

Vuln IDs

V-217169
V-77193

Rule IDs

SV-217169r854097_rule
SV-91889

Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.

Checks: C-18397r369663_chk

Verify all SUSE operating system files and directories on the system have a valid group. Check the owner of all files and directories with the following command: Note: The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -fstype xfs -nogroup If any files on the system do not have an assigned group, this is a finding.

Fix: F-18395r369664_fix

Either remove all files and directories from the SUSE operating system that do not have a valid group, or assign a valid group to all files and directories on the system with the "chgrp" command: # sudo chgrp <group> <file>

b

All SUSE operating system local interactive users must have a home directory assigned in the /etc/passwd file.

CM-6 - Medium - CCI-000366 - V-217170 - SV-217170r646728_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010710

Vuln IDs

V-217170
V-77197

Rule IDs

SV-217170r646728_rule
SV-91893

If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.

Checks: C-18398r646726_chk

Verify SUSE operating system local interactive users on the system have a home directory assigned. Check for missing local interactive user home directories with the following command: > sudo pwck -r user 'smithj': directory '/home/smithj' does not exist Ask the System Administrator (SA) if any users found without home directories are local interactive users. If the SA is unable to provide a response, check for users with a User Identifier (UID) of 1000 or greater with the following command: > sudo awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd If any interactive users do not have a home directory assigned, this is a finding.

Fix: F-18396r646727_fix

Assign home directories to all SUSE operating system local interactive users that currently do not have a home directory assigned. Assign a home directory to users via the usermod command: > sudo usermod -d /home/smithj smithj

b

All SUSE operating system local interactive user accounts, upon creation, must be assigned a home directory.

CM-6 - Medium - CCI-000366 - V-217171 - SV-217171r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010720

Vuln IDs

V-217171
V-77199

Rule IDs

SV-217171r603262_rule
SV-91895

If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.

Checks: C-18399r369669_chk

Verify all SUSE operating system local interactive users on the system are assigned a home directory upon creation. Check to see if the system is configured to create home directories for local interactive users with the following command: # grep -i create_home /etc/login.defs CREATE_HOME yes If the value for "CREATE_HOME" parameter is not set to "yes", the line is missing, or the line is commented out, this is a finding.

Fix: F-18397r369670_fix

Configure the SUSE operating system to assign home directories to all new local interactive users by setting the "CREATE_HOME" parameter in "/etc/login.defs" to "yes" as follows. CREATE_HOME yes

b

All SUSE operating system local interactive user home directories defined in the /etc/passwd file must exist.

CM-6 - Medium - CCI-000366 - V-217172 - SV-217172r603885_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010730

Vuln IDs

V-217172
V-77203

Rule IDs

SV-217172r603885_rule
SV-91899

If a local interactive user has a home directory defined that does not exist, the user may be given access to the / directory as the current working directory upon logon. This could create a Denial of Service because the user would not be able to access their logon configuration files, and it may give them visibility to system files they normally would not be able to access.

Checks: C-18400r622348_chk

Verify the assigned home directory of all SUSE operating system local interactive users on the system exists. Check the home directory assignment for all local interactive non-privileged users on the system with the following command: # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $6}' /etc/passwd smithj /home/smithj Note: This may miss interactive users that have been assigned a privileged UID. Evidence of interactive use may be obtained from a number of log files containing system logon information. Check that all referenced home directories exist with the following command: # pwck -r user 'smithj': directory '/home/smithj' does not exist If any home directories referenced in "/etc/passwd" are returned as not defined, this is a finding.

Fix: F-18398r369673_fix

Create home directories to all SUSE operating system local interactive users that currently do not have a home directory assigned. Use the following commands to create the user home directory assigned in "/etc/ passwd": Note: The example will be for the user smithj, who has a home directory of "/home/smithj", a UID of "smithj", and a Group Identifier (GID) of "users assigned" in "/etc/passwd". # mkdir /home/smithj # chown smithj /home/smithj # chgrp users /home/smithj # chmod 0750 /home/smithj

b

All SUSE operating system local interactive user home directories must have mode 0750 or less permissive.

CM-6 - Medium - CCI-000366 - V-217173 - SV-217173r603887_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010740

Vuln IDs

V-217173
V-77207

Rule IDs

SV-217173r603887_rule
SV-91903

Excessive permissions on local interactive user home directories may allow unauthorized access to user files by other users.

Checks: C-18401r622350_chk

Verify the assigned home directory of all SUSE operating system local interactive users has a mode of "0750" or less permissive. Check the home directory assignment for all non-privileged users on the system with the following command: Note: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information. # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 18 Mar 5 17:06 /home/smithj If home directories referenced in "/etc/passwd" do not have a mode of "0750" or less permissive, this is a finding.

Fix: F-18399r369676_fix

Change the mode of SUSE operating system local interactive user's home directories to "0750". To change the mode of a local interactive user's home directory, use the following command: Note: The example will be for the user "smithj". # chmod 0750 /home/smithj

b

All SUSE operating system local interactive user home directories must be group-owned by the home directory owners primary group.

CM-6 - Medium - CCI-000366 - V-217174 - SV-217174r603889_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010750

Vuln IDs

V-217174
V-77211

Rule IDs

SV-217174r603889_rule
SV-91907

If the Group Identifier (GID) of a local interactive user’s home directory is not the same as the primary GID of the user, this would allow unauthorized access to the user’s files, and users that share the same group may not be able to access files that they legitimately should.

Checks: C-18402r622352_chk

Verify the assigned home directory of all SUSE operating system local interactive users is group-owned by that user's primary GID. Check the home directory assignment for all non-privileged users on the system with the following command: Note: This may miss local interactive users that have been assigned a privileged UID. Evidence of interactive use may be obtained from a number of log files containing system logon information. The returned directory "/home/smithj" is used as an example. # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $4, $6}' /etc/passwd 250 /home/smithj Check the user's primary group with the following command: # grep users /etc/group users:x:250:smithj,jonesj,jacksons If the user home directory referenced in "/etc/passwd" is not group-owned by that user's primary GID, this is a finding.

Fix: F-18400r369679_fix

Change the group owner of a SUSE operating system local interactive user's home directory to the group found in "/etc/passwd". To change the group owner of a local interactive user's home directory, use the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj", and has a primary group of users. # chgrp users /home/smithj

b

All SUSE operating system local initialization files must have mode 0740 or less permissive.

CM-6 - Medium - CCI-000366 - V-217175 - SV-217175r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010760

Vuln IDs

V-217175
V-77215

Rule IDs

SV-217175r603262_rule
SV-91911

Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.

Checks: C-18403r369681_chk

Verify that all SUSE operating system local initialization files have a mode of "0740" or less permissive. Check the mode on all SUSE operating system local initialization files with the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # ls -al /home/smithj/.* | more -rwxr-xr-x 1 smithj users 896 Mar 10 2011 .profile -rwxr-xr-x 1 smithj users 497 Jan 6 2007 .login -rwxr-xr-x 1 smithj users 886 Jan 6 2007 .something If any local initialization files have a mode more permissive than "0740", this is a finding.

Fix: F-18401r369682_fix

Set the mode of SUSE operating system local initialization files to "0740" with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj". # chmod 0740 /home/smithj/.<INIT_FILE>

b

All SUSE operating system local interactive user initialization files executable search paths must contain only paths that resolve to the users home directory.

CM-6 - Medium - CCI-000366 - V-217176 - SV-217176r793056_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010770

Vuln IDs

V-217176
V-77219

Rule IDs

SV-217176r793056_rule
SV-91915

The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory (other than the user's home directory), executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).

Checks: C-18404r793055_chk

Verify that all SUSE operating system local interactive user initialization files executable search path statements do not contain statements that will reference a working directory other than the user's home directory. Check the executable search path statement for all operating system local interactive user initialization files in the user's home directory with the following commands: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # sudo grep -i path= /home/smithj/.* /home/smithj/.bash_profile:PATH=$PATH:$HOME/.local/bin:$HOME/bin If any local interactive user initialization files have executable search path statements that include directories outside of their home directory, and the additional path statements are not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix: F-18402r369685_fix

Edit the SUSE operating system local interactive user initialization files to change any PATH variable statements for executables that reference directories other than their home directory. If a local interactive user requires path variables to reference a directory owned by the application, it must be documented with the ISSO.

b

All SUSE operating system local initialization files must not execute world-writable programs.

CM-6 - Medium - CCI-000366 - V-217177 - SV-217177r646731_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010780

Vuln IDs

V-217177
V-77225

Rule IDs

SV-217177r646731_rule
SV-91921

If user start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to destroy user files or otherwise compromise the system at the user level. If the system is compromised at the user level, it is easier to elevate privileges to eventually compromise the system at the root and network level.

Checks: C-18405r646729_chk

Verify that SUSE operating system local initialization files do not execute world-writable programs. Check the system for world-writable files with the following command: > sudo find / -xdev -perm -002 -type f -exec ls -ld {} \; For all files listed, check for their presence in the local initialization files with the following command: Note: The example will be for a system that is configured to create users' home directories in the "/home" directory. > sudo find /home/* -maxdepth 1 -type f -name \.\* -exec grep -H <file> {} \; If any local initialization files are found to reference world-writable files, this is a finding.

Fix: F-18403r646730_fix

Remove the references to these files in the local initialization scripts or remove the world-writable permission of files referenced by SUSE operating system local initialization scripts with the following command: > sudo chmod 0755 <file>

b

SUSE operating system file systems that contain user home directories must be mounted to prevent files with the setuid and setgid bit set from being executed.

CM-6 - Medium - CCI-000366 - V-217178 - SV-217178r603891_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010790

Vuln IDs

V-217178
V-77229

Rule IDs

SV-217178r603891_rule
SV-91925

The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and setguid files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Checks: C-18406r622354_chk

Verify that SUSE operating system file systems that contain user home directories are mounted with the "nosuid" option. Print the currently active file system mount options of the file system(s) that contain the user home directories with the following command: # for X in `awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd`; do findmnt -nkT $X; done | sort -r /home /dev/mapper/system-home ext4 rw,nosuid,relatime,data=ordered If a file system containing user home directories is not mounted with the FSTYPE OPTION nosuid, this is a finding. Note: If a separate file system has not been created for the user home directories (user home directories are mounted under "/"), this is not a finding as the "nosuid" option cannot be used on the "/" system.

Fix: F-18404r369691_fix

Configure the SUSE operating system "/etc/fstab" file to use the "nosuid" option on file systems that contain user home directories for interactive users. Re-mount the filesystems. # mount -o remount /home

b

SUSE operating system file systems that are used with removable media must be mounted to prevent files with the setuid and setgid bit set from being executed.

CM-6 - Medium - CCI-000366 - V-217179 - SV-217179r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010800

Vuln IDs

V-217179
V-77237

Rule IDs

SV-217179r603262_rule
SV-91933

The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Checks: C-18407r369693_chk

Verify SUSE operating system file systems used for removable media are mounted with the "nosuid" option. Check the file systems that are mounted at boot time with the following command: # more /etc/fstab UUID=2bc871e4-e2a3-4f29-9ece-3be60c835222 /mnt/usbflash vfat noauto,owner,ro,nosuid 0 0 If a file system found in "/etc/fstab" refers to removable media and it does not have the "nosuid" option set, this is a finding.

Fix: F-18405r369694_fix

Configure the SUSE operating system "/etc/fstab" file to use the "nosuid" option on file systems that are associated with removable media.

b

SUSE operating system file systems that are being imported via Network File System (NFS) must be mounted to prevent files with the setuid and setgid bit set from being executed.

CM-6 - Medium - CCI-000366 - V-217180 - SV-217180r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010810

Vuln IDs

V-217180
V-77241

Rule IDs

SV-217180r603262_rule
SV-91937

The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Checks: C-18408r369696_chk

Verify SUSE operating system file systems that are being NFS exported are mounted with the "nosuid" option. Find the file system(s) that contain the directories being exported with the following command: # more /etc/fstab | grep nfs UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,nosuid 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "nosuid" option set, this is a finding.

Fix: F-18406r369697_fix

Configure the SUSE operating system "/etc/fstab" file to use the "nosuid" option on file systems that are being exported via NFS.

b

SUSE operating system file systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.

CM-6 - Medium - CCI-000366 - V-217181 - SV-217181r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010820

Vuln IDs

V-217181
V-77251

Rule IDs

SV-217181r603262_rule
SV-91947

The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Checks: C-18409r369699_chk

Verify the SUSE operating system file systems that are being NFS exported are mounted with the "noexec" option. Find the file system(s) that contain the directories being exported with the following command: # more /etc/fstab | grep nfs UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,noexec 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS exported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix: F-18407r369700_fix

Configure the SUSE operating system "/etc/fstab" file to use the "noexec" option on file systems that are being exported via NFS.

b

All SUSE operating system world-writable directories must be group-owned by root, sys, bin, or an application group.

CM-6 - Medium - CCI-000366 - V-217182 - SV-217182r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010830

Vuln IDs

V-217182
V-77253

Rule IDs

SV-217182r603262_rule
SV-91949

If a world-writable directory has the sticky bit set and is not group-owned by a privileged Group Identifier (GID), unauthorized users may be able to modify files created by others. The only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.

Checks: C-18410r369702_chk

Verify all SUSE operating system world-writable directories are group-owned by root, sys, bin, or an application group. Check the system for world-writable directories with the following command: Note: The example below should be repeated for each locally defined partition. The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -xdev -perm -002 -type d -fstype xfs -exec ls -lLd {} \; drwxrwxrwt. 2 root root 40 Aug 26 13:07 /dev/mqueue drwxrwxrwt. 2 root root 220 Aug 26 13:23 /dev/shm drwxrwxrwt. 14 root root 4096 Aug 26 13:29 /tmp If any world-writable directories are not owned by root, sys, bin, or an application group associated with the directory, this is a finding.

Fix: F-18408r369703_fix

Change the group of the SUSE operating system world-writable directories to root with the following command: # chgrp root <directory>

b

SUSE operating system kernel core dumps must be disabled unless needed.

CM-6 - Medium - CCI-000366 - V-217183 - SV-217183r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010840

Vuln IDs

V-217183
V-77257

Rule IDs

SV-217183r603262_rule
SV-91953

Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a considerable amount of disk space and may result in denial of service by exhausting the available space on the target file system partition.

Checks: C-18411r369705_chk

Verify that SUSE operating system kernel core dumps are disabled unless needed. Check the status of the "kdump" service with the following command: # systemctl status kdump.service Loaded: not-found (Reason: No such file or directory) Active: inactive (dead) If the "kdump" service is active, ask the System Administrator if the use of the service is required and documented with the Information System Security Officer (ISSO). If the service is active and is not documented, this is a finding.

Fix: F-18409r369706_fix

If SUSE operating system kernel core dumps are not required, disable the "kdump" service with the following command: # systemctl disable kdump.service If kernel core dumps are required, document the need with the ISSO.

a

A separate file system must be used for SUSE operating system user home directories (such as /home or an equivalent).

CM-6 - Low - CCI-000366 - V-217184 - SV-217184r603893_rule

RMF Control

CM-6

Severity

L

CCI

Version

SLES-12-010850

Vuln IDs

V-217184
V-77261

Rule IDs

SV-217184r603893_rule
SV-91957

The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.

Checks: C-18412r622356_chk

Verify that a separate file system/partition has been created for SUSE operating system non-privileged local interactive user home directories. Check the home directory assignment for all non-privileged users (those with a UID greater than 1000) on the system with the following command: # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6, $7}' /etc/passwd adamsj 1002 /home/adamsj /bin/bash jacksonm 1003 /home/jacksonm /bin/bash smithj 1001 /home/smithj /bin/bash The output of the command will give the directory/partition that contains the home directories for the non-privileged users on the system (in this example, /home) and user's shell. All accounts with a valid shell (such as /bin/bash) are considered interactive users. Check that a file system/partition has been created for the non-privileged interactive users with the following command: Note: The partition of /home is used in the example. # grep /home /etc/fstab UUID=333ada18 /home ext4 noatime,nobarrier,nodev 1 2 If a separate entry for the file system/partition that contains the non-privileged interactive users' home directories does not exist, this is a finding.

Fix: F-18410r369709_fix

Create a separate file system/partition for SUSE operating system non-privileged local interactive user home directories. Migrate the non-privileged local interactive user home directories onto the separate file system/partition.

a

The SUSE operating system must use a separate file system for /var.

CM-6 - Low - CCI-000366 - V-217185 - SV-217185r603262_rule

RMF Control

CM-6

Severity

L

CCI

Version

SLES-12-010860

Vuln IDs

V-217185
V-77265

Rule IDs

SV-217185r603262_rule
SV-91961

The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.

Checks: C-18413r369711_chk

Verify that the SUSE operating system has a separate file system/partition for "/var". Check that a file system/partition has been created for "/var" with the following command: # grep /var /etc/fstab UUID=c274f65f /var ext4 noatime,nobarrier 1 2 If a separate entry for "/var" is not in use, this is a finding.

Fix: F-18411r369712_fix

Create a separate file system/partition on the SUSE operating system for "/var". Migrate "/var" onto the separate file system/partition.

a

The SUSE operating system must use a separate file system for the system audit data path.

CM-6 - Low - CCI-000366 - V-217186 - SV-217186r603262_rule

RMF Control

CM-6

Severity

L

CCI

Version

SLES-12-010870

Vuln IDs

V-217186
V-77271

Rule IDs

SV-217186r603262_rule
SV-91967

The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.

Checks: C-18414r369714_chk

Verify that the SUSE operating system has a separate file system/partition for the system audit data path. Check that a file system/partition has been created for the system audit data path with the following command: Note: "/var/log/audit" is used as the example as it is a common location. #grep /var/log/audit /etc/fstab UUID=3645951a /var/log/audit ext4 defaults 1 2 If a separate entry for the system audit data path (in this example the "/var/log/audit" path) does not exist, ask the System Administrator if the system audit logs are being written to a different file system/partition on the system and then grep for that file system/partition. If a separate file system/partition does not exist for the system audit data path, this is a finding.

Fix: F-18412r369715_fix

Migrate the SUSE operating system audit data path onto a separate file system.

b

The SUSE operating system must prevent unauthorized users from accessing system error messages.

SI-11 - Medium - CCI-001314 - V-217188 - SV-217188r646734_rule

RMF Control

SI-11

Severity

M

CCI

CCI-001314

Version

SLES-12-010890

Vuln IDs

V-217188
V-77275

Rule IDs

SV-217188r646734_rule
SV-91971

Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the SUSE operating system or platform. Additionally, Personally Identifiable Information (PII) and operational information must not be revealed through error messages to unauthorized personnel or their designated representatives. The structure and content of error messages must be carefully considered by the organization and development team. The extent to which the information system is able to identify and handle error conditions is guided by organizational policy and operational requirements.

Checks: C-18416r646732_chk

Verify that the SUSE operating system prevents unauthorized users from accessing system error messages. Check the "/var/log/messages" file permissions with the following comand: > sudo stat -c "%n %U:%G %a" /var/log/messages /var/log/messages root:root 640 Check that "permissions.local" file contains the correct permissions rules with the following command: > grep -i messages /etc/permissions.local /var/log/messages root:root 640 If the effective permissions do not match the "permissions.local" file, the command does not return any output, or is commented out, this is a finding.

Fix: F-18414r646733_fix

Configure the SUSE operating system to prevent unauthorized users from accessing system error messages. Add or update the following rules in "/etc/permissions.local": /var/log/messages root:root 640 Set the correct permissions with the following command: > sudo chkstat --set --system

b

The SUSE operating system must be configured to not overwrite Pluggable Authentication Modules (PAM) configuration on package changes.

CM-6 - Medium - CCI-000366 - V-217189 - SV-217189r646737_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010910

Vuln IDs

V-217189
V-77285

Rule IDs

SV-217189r646737_rule
SV-91981

"pam-config" is a command line utility that automatically generates a system PAM configuration as packages are installed, updated or removed from the system. "pam-config" removes configurations for PAM modules and parameters that it does not know about. It may render ineffective PAM configuration by the system administrator and thus impact system security.

Checks: C-18417r646735_chk

Verify the SUSE operating system is configured to not overwrite Pluggable Authentication Modules (PAM) configuration on package changes. Check that soft links between PAM configuration files are removed with the following command: > find /etc/pam.d/ -type l -iname "common-*" If any results are returned, this is a finding.

Fix: F-18415r646736_fix

Copy the PAM configuration files to their static locations and remove the SUSE operating system soft links for the PAM configuration files with the following command: > sudo sh -c 'for X in /etc/pam.d/common-*-pc; do cp -ivp --remove-destination $X ${X:0:-3}; done' Additional information on the configuration of multifactor authentication on the SUSE operating system can be found at https://www.suse.com/communities/blog/configuring-smart-card-authentication-suse-linux-enterprise/.

b

The SUSE operating system must have the auditing package installed.

AU-12 - Medium - CCI-000172 - V-217190 - SV-217190r877036_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020000

Vuln IDs

V-217190
V-77287

Rule IDs

SV-217190r877036_rule
SV-91983

Without establishing what type of events occurred, the source of events, where events occurred, and the outcome of events, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked. Associating event types with detected events in the SUSE operating system audit logs provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured SUSE operating system. Satisfies: SRG-OS-000337-GPOS-00129, SRG-OS-000348-GPOS-00136, SRG-OS-000349-GPOS-00137, SRG-OS-000350-GPOS-00138, SRG-OS-000351-GPOS-00139, SRG-OS-000352-GPOS-00140, SRG-OS-000353-GPOS-00141, SRG-OS-000354-GPOS-00142, SRG-OS-000358-GPOS-00145, SRG-OS-000359-GPOS-00146, SRG-OS-000365-GPOS-00152, SRG-OS-000474-GPOS-00219, SRG-OS-000475-GPOS-00220

Checks: C-18418r369726_chk

Verify the SUSE operating system auditing package is installed. Check that the "audit" package is installed by performing the following command: # zypper se audit i | audit | User Space Tools for 2.6 Kernel Auditing If the package "audit" is not installed on the system, then this is a finding.

Fix: F-18416r369727_fix

The SUSE operating system auditd package must be installed on the system. If it is not installed, use the following command to install it: # sudo zypper in auditd

b

SUSE operating system audit records must contain information to establish what type of events occurred, the source of events, where events occurred, and the outcome of events.

CM-6 - Medium - CCI-000366 - V-217191 - SV-217191r854099_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-020010

Vuln IDs

V-217191
V-77289

Rule IDs

SV-217191r854099_rule
SV-91985

Without establishing what type of events occurred, the source of events, where events occurred, and the outcome of events, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked. Associating event types with detected events in the SUSE operating system audit logs provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured SUSE operating system. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000038-GPOS-00016, SRG-OS-000039-GPOS-00017, SRG-OS-000040-GPOS-00018, SRG-OS-000041-GPOS-00019, SRG-OS-000042-GPOS-00021, SRG-OS-000051-GPOS-00024, SRG-OS-000054-GPOS-00025, SRG-OS-000122-GPOS-00063, SRG-OS-000254-GPOS-00095, SRG-OS-000255-GPOS-00096, SRG-OS-000392-GPOS-00172, SRG-OS-000480-GPOS-00227

Checks: C-18419r369729_chk

Verify the SUSE operating system produces audit records. Check that the SUSE operating system produces audit records by running the following command to determine the current status of the auditd service: # systemctl status auditd.service If the service is enabled, the returned message must contain the following text: Active: active (running) If the service is not running, this is a finding.

Fix: F-18417r369730_fix

Enable the SUSE operating system auditd service by performing the following commands: # sudo systemctl enable auditd.service # sudo systemctl start auditd.service

b

The SUSE operating system must allocate audit record storage capacity to store at least one weeks worth of audit records when audit records are not immediately sent to a central audit record storage facility.

AU-4 - Medium - CCI-001849 - V-217192 - SV-217192r877391_rule

RMF Control

AU-4

Severity

M

CCI

CCI-001849

Version

SLES-12-020020

Vuln IDs

V-217192
V-77291

Rule IDs

SV-217192r877391_rule
SV-91987

To ensure SUSE operating systems have a sufficient storage capacity in which to write the audit logs, SUSE operating systems need to be able to allocate audit record storage capacity. The task of allocating audit record storage capacity is usually performed during initial installation of the SUSE operating system.

Checks: C-18420r369732_chk

Verify the SUSE operating system allocates audit record storage capacity to store at least one week's worth of audit records when audit records are not immediately sent to a central audit record storage facility. Determine which partition the audit records are being written to with the following command: # sudo grep log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Check the size of the partition that audit records are written to (with the example being /var/log/audit/) with the following command: # df -h /var/log/audit/ /dev/sda2 24G 10.4G 13.6G 43% /var/log/audit If the audit records are not written to a partition made specifically for audit records (/var/log/audit is a separate partition), determine the amount of space being used by other files in the partition with the following command: #du -sh [audit_partition] 1.8G /var/log/audit The partition size needed to capture a week's worth of audit records is based on the activity level of the system and the total storage capacity available. In normal circumstances, 10.0 GB of storage space for audit records will be sufficient. If the audit record partition is not allocated sufficient storage capacity, this is a finding.

Fix: F-18418r369733_fix

Allocate enough storage capacity for at least one week's worth of SUSE operating system audit records when audit records are not immediately sent to a central audit record storage facility. If audit records are stored on a partition made specifically for audit records, use the "YaST2 - Partitioner" program (installation and configuration tool for Linux) to resize the partition with sufficient space to contain one week's worth of audit records. If audit records are not stored on a partition made specifically for audit records, a new partition with sufficient amount of space will need be to be created. The new partition can be created using the "YaST2 - Partitioner" program on the system.

b

The SUSE operating system auditd service must notify the System Administrator (SA) and Information System Security Officer (ISSO) immediately when audit storage capacity is 75 percent full.

AU-5 - Medium - CCI-001855 - V-217193 - SV-217193r877389_rule

RMF Control

AU-5

Severity

M

CCI

CCI-001855

Version

SLES-12-020030

Vuln IDs

V-217193
V-77293

Rule IDs

SV-217193r877389_rule
SV-91989

If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to plan for audit record storage capacity expansion.

Checks: C-18421r369735_chk

Determine if the SUSE operating system auditd is configured to notify the System Administrator (SA) and Information System Security Officer (ISSO) when the audit record storage volume reaches 75 percent of the storage capacity. Check the system configuration to determine the partition to which audit records are written using the following command: # grep -iw log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Check the size of the partition to which audit records are written (e.g., "/var/log/audit/"): # df -h /var/log/audit/ 0.9G /var/log/audit If the audit records are not being written to a partition specifically created for audit records (in this example "/var/log/audit" is a separate partition), use the following command to determine the amount of space other files in the partition currently occupy: # du -sh <partition> 1.8G /var Determine the threshold for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached: # grep -iw space_left /etc/audit/auditd.conf space_left = 225 If the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.

Fix: F-18419r369736_fix

Check the system configuration to determine the partition to which the audit records are written: # grep -iw log_file /etc/audit/auditd.conf Determine the size of the partition to which audit records are written (e.g., "/var/log/audit/"): # df -h /var/log/audit/ Set the value of the "space_left" keyword in "/etc/audit/auditd.conf" to 25 percent of the partition size.

b

The Information System Security Officer (ISSO) and System Administrator (SA), at a minimum, must be alerted of a SUSE operating system audit processing failure event.

AU-5 - Medium - CCI-000139 - V-217194 - SV-217194r603262_rule

RMF Control

AU-5

Severity

M

CCI

CCI-000139

Version

SLES-12-020040

Vuln IDs

V-217194
V-77295

Rule IDs

SV-217194r603262_rule
SV-91991

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. This requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both.

Checks: C-18422r369738_chk

Verify the administrators are notified in the event of a SUSE operating system audit processing failure by inspecting "/etc/audit/auditd.conf". Check if the system is configured to send email to an account when it needs to notify an administrator with the following command: sudo grep action_mail /etc/audit/auditd.conf action_mail_acct = root If the value of the "action_mail_acct" keyword is not set to "root" and/or other accounts for security personnel, the "action_mail_acct" keyword is missing, or the returned line is commented out, this is a finding.

Fix: F-18420r369739_fix

Configure the auditd service to notify the administrators in the event of a SUSE operating system audit processing failure. Edit the following line in "/etc/audit/auditd.conf" to ensure that administrators are notified via email for those situations: action_mail_acct = root

b

The Information System Security Officer (ISSO) and System Administrator (SA), at a minimum, must have mail aliases to be notified of a SUSE operating system audit processing failure.

AU-5 - Medium - CCI-000139 - V-217195 - SV-217195r646740_rule

RMF Control

AU-5

Severity

M

CCI

CCI-000139

Version

SLES-12-020050

Vuln IDs

V-217195
V-77297

Rule IDs

SV-217195r646740_rule
SV-91993

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. This requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both.

Checks: C-18423r646738_chk

Verify the administrators are notified in the event of a SUSE operating system audit processing failure by checking that "/etc/aliases" has a defined value for root. > grep -i "^postmaster:" /etc/aliases postmaster: root If the above command does not return a value of "root", this is a finding Verify the alias for root forwards to a monitored e-mail account: > grep -i "^root:" /etc/aliases root: person@server.mil If the alias for root does not forward to a monitored e-mail account, this is a finding.

Fix: F-18421r646739_fix

Configure the auditd service to notify the administrators in the event of a SUSE operating system audit processing failure. Configure an alias value for the postmaster with the following command: > sudo sh -c 'echo "postmaster: root" >> /etc/aliases' Configure an alias for root that forwards to a monitored email address with the following command: > sudo sh -c 'echo "root: box@server.mil" >> /etc/aliases' The following command must be run to implement changes to the /etc/aliases file: > sudo newaliases

b

The SUSE operating system audit system must take appropriate action when the audit storage volume is full.

AU-5 - Medium - CCI-000140 - V-217196 - SV-217196r603262_rule

RMF Control

AU-5

Severity

M

CCI

CCI-000140

Version

SLES-12-020060

Vuln IDs

V-217196
V-77299

Rule IDs

SV-217196r603262_rule
SV-91995

It is critical that when the SUSE operating system is at risk of failing to process audit logs as required, it takes action to mitigate the failure. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. Responses to audit failure depend on the nature of the failure mode. When availability is an overriding concern, other approved actions in response to an audit failure are as follows: 1) If the failure was caused by the lack of audit record storage capacity, the SUSE operating system must continue generating audit records if possible (automatically restarting the audit service if necessary), overwriting the oldest audit records in a first-in-first-out manner. 2) If audit records are sent to a centralized collection server and communication with this server is lost or the server fails, the SUSE operating system must queue audit records locally until communication is restored or until the audit records are retrieved manually. Upon restoration of the connection to the centralized collection server, action should be taken to synchronize the local audit data with the collection server.

Checks: C-18424r369744_chk

Verify the SUSE operating system takes the appropriate action when the audit storage volume is full. Check that the SUSE operating system takes the appropriate action when the audit storage volume is full with the following command: # sudo grep disk_full_action /etc/audit/auditd.conf disk_full_action = SYSLOG If the value of the "disk_full_action" option is not "SYSLOG", "SINGLE", or "HALT", or the line is commented out, this is a finding.

Fix: F-18422r369745_fix

Configure the SUSE operating system to shut down by default upon audit failure (unless availability is an overriding concern). Add or update the following line (depending on configuration "disk_full_action" can be set to "SYSLOG", "SINGLE", or "HALT" depending on configuration) in "/etc/audit/auditd.conf" file: disk_full_action = HALT

b

The audit-audispd-plugins must be installed on the SUSE operating system.

AU-4 - Medium - CCI-001851 - V-217197 - SV-217197r877390_rule

RMF Control

AU-4

Severity

M

CCI

Version

SLES-12-020070

Vuln IDs

V-217197
V-77301

Rule IDs

SV-217197r877390_rule
SV-91997

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Checks: C-18425r369747_chk

Verify that the "audit-audispd-plugins" package is installed on the SUSE operating system. Check that the "audit-audispd-plugins" package is installed on the SUSE operating system with the following command: # zypper se audit-audispd-plugins If the "audit-audispd-plugins" package is not installed, this is a finding. Verify the "au-remote" plugin is enabled with the following command: # grep -i active /etc/audisp/plugins.d/au-remote.conf active = yes If "active" is missing, commented out, or is not set to "yes", this is a finding.

Fix: F-18423r369748_fix

Install the "audit-audispd-plugins" package on the SUSE operating system by running the following command: # sudo zypper install audit-audispd-plugins In /etc/audisp/plugins.d/au-remote.conf, change the value of "active" to "yes", or add "active = yes" if no such setting exists in the file.

a

The SUSE operating system audit event multiplexor must be configured to use Kerberos.

AU-4 - Low - CCI-001851 - V-217198 - SV-217198r877390_rule

RMF Control

AU-4

Severity

L

CCI

Version

SLES-12-020080

Vuln IDs

V-217198
V-77303

Rule IDs

SV-217198r877390_rule
SV-91999

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Allowing devices and users to connect to or from the system without first authenticating them allows untrusted access and can lead to a compromise or attack. Audit events may include sensitive data must be encrypted prior to transmission. Kerberos provides a mechanism to provide both authentication and encryption for audit event records.

Checks: C-18426r369750_chk

Determine if the SUSE operating system audit event multiplexor is configured to use Kerberos by running the following command: # sudo cat /etc/audisp/audisp-remote.conf | grep enable_krb5 enable_krb5 = yes If "enable-krb5" is not set to "yes", this is a finding.

Fix: F-18424r369751_fix

Configure the SUSE operating system audit event multiplexor to use Kerberos by editing the "/etc/audisp/audisp-remote.conf" file. Edit or add the following line to match the text below: enable_krb5 = yes

a

Audispd must off-load audit records onto a different system or media from the SUSE operating system being audited.

AU-4 - Low - CCI-001851 - V-217199 - SV-217199r877390_rule

RMF Control

AU-4

Severity

L

CCI

Version

SLES-12-020090

Vuln IDs

V-217199
V-77305

Rule IDs

SV-217199r877390_rule
SV-92001

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Checks: C-18427r369753_chk

Verify "audispd" off-loads audit records onto a different system or media from the SUSE operating system being audited. Check if "audispd" is configured to off-load audit records onto a different system or media from the SUSE operating system by running the following command: # sudo cat /etc/audisp/audisp-remote.conf | grep remote_server remote_server = 192.168.1.101 If "remote_server" is not set to an external server or media, this is a finding.

Fix: F-18425r369754_fix

Configure the SUSE operating system "/etc/audisp/audisp-remote.conf" file to off-load audit records onto a different system or media by adding or editing the following line with the correct IP address: remote_server = [IP ADDRESS]

b

The audit system must take appropriate action when the network cannot be used to off-load audit records.

AU-4 - Medium - CCI-001851 - V-217200 - SV-217200r854105_rule

RMF Control

AU-4

Severity

M

CCI

Version

SLES-12-020100

Vuln IDs

V-217200
V-77307

Rule IDs

SV-217200r854105_rule
SV-92003

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Checks: C-18428r369756_chk

Verify what action the audit system takes if it cannot off-load audit records to a different system or storage media from the SUSE operating system being audited. Check the action that the audit system takes in the event of a network failure with the following command: # sudo grep -i "network_failure_action" /etc/audisp/audisp-remote.conf network_failure_action = syslog If the "network_failure_action" option is not set to "syslog", "single", or "halt" or the line is commented out, this is a finding.

Fix: F-18426r369757_fix

Configure the SUSE operating system to take the appropriate action if it cannot off-load audit records to a different system or storage media from the system being audited due to a network failure. Uncomment the "network_failure_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt". See the example below: network_failure_action = syslog

b

Audispd must take appropriate action when the SUSE operating system audit storage is full.

AU-4 - Medium - CCI-001851 - V-217201 - SV-217201r854106_rule

RMF Control

AU-4

Severity

M

CCI

Version

SLES-12-020110

Vuln IDs

V-217201
V-77309

Rule IDs

SV-217201r854106_rule
SV-92005

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Checks: C-18429r369759_chk

Verify the audit system off-loads audit records if the SUSE operating system storage volume becomes full. Check that the records are properly off-loaded to a remote server with the following command: # sudo grep -i "disk_full_action" /etc/audisp/audisp-remote.conf disk_full_action = syslog If "disk_full_action" is not set to "syslog", "single", or "halt" or the line is commented out, this is a finding.

Fix: F-18427r369760_fix

Configure the SUSE operating system to take the appropriate action if the audit storage is full. Add, edit, or uncomment the "disk_full_action" option in "/etc/audisp/audisp-remote.conf". Set it to "syslog", "single" or "halt" as in the example below: disk_full_action = syslog

b

The SUSE operating system must protect audit rules from unauthorized modification.

AU-9 - Medium - CCI-000162 - V-217202 - SV-217202r603262_rule

RMF Control

AU-9

Severity

M

CCI

CCI-000162

Version

SLES-12-020120

Vuln IDs

V-217202
V-77311

Rule IDs

SV-217202r603262_rule
SV-92007

Without the capability to restrict which roles and individuals can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured audits may degrade the system's performance by overwhelming the audit log. Misconfigured audits may also make it more difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Checks: C-18430r369762_chk

Verify that the SUSE operating system protects audit rules from unauthorized modification. Check that "permissions.local" file contains the correct permissions rules with the following command: # grep -i audit /etc/permissions.local /var/log/audit root:root 600 /var/log/audit/audit.log root:root 600 /etc/audit/audit.rules root:root 640 /etc/audit/rules.d/audit.rules root:root 640 If the command does not return any output, this is a finding. Check that all of the audit information files and folders have the correct permissions with the following command: # sudo chkstat /etc/permissions.local If the command returns any output, this is a finding.

Fix: F-18428r369763_fix

Configure the SUSE operating system to protect audit rules from unauthorized modification. Add or update the following rules in "/etc/permissions.local": /var/log/audit root:root 600 /var/log/audit/audit.log root:root 600 /etc/audit/audit.rules root:root 640 /etc/audit/rules.d/audit.rules root:root 640 Set the correct permissions with the following command: # sudo chkstat --set /etc/permissions.local

b

The SUSE operating system audit tools must have the proper permissions configured to protect against unauthorized access.

AU-9 - Medium - CCI-001493 - V-217203 - SV-217203r646743_rule

RMF Control

AU-9

Severity

M

CCI

CCI-001493

Version

SLES-12-020130

Vuln IDs

V-217203
V-77313

Rule IDs

SV-217203r646743_rule
SV-92009

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information. SUSE operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user enjoys to make access decisions regarding the access to audit tools. Audit tools include but are not limited to vendor-provided and open-source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators. Satisfies: SRG-OS-000256-GPOS-00097, SRG-OS-000257-GPOS-00098, SRG-OS-000258-GPOS-00099

Checks: C-18431r646741_chk

Verify that the SUSE operating system audit tools have the proper permissions configured in the permissions profile to protect from unauthorized access. Check that "permissions.local" file contains the correct permissions rules with the following command: > grep "^/usr/sbin/au" /etc/permissions.local /usr/sbin/audispd root:root 0750 /usr/sbin/auditctl root:root 0750 /usr/sbin/auditd root:root 0750 /usr/sbin/ausearch root:root 0755 /usr/sbin/aureport root:root 0755 /usr/sbin/autrace root:root 0750 /usr/sbin/augenrules root:root 0750 If the command does not return any output, this is a finding. Check that all of the audit information files and folders have the correct permissions with the following command: > sudo chkstat /etc/permissions.local If the command returns any output, this is a finding.

Fix: F-18429r646742_fix

Configure the SUSE operating system audit tools to have with proper permissions set in the permissions profile to protect from unauthorized access. Edit the file "/etc/permissions.local" and insert the following text: /usr/sbin/audispd root:root 0750 /usr/sbin/auditctl root:root 0750 /usr/sbin/auditd root:root 0750 /usr/sbin/ausearch root:root 0755 /usr/sbin/aureport root:root 0755 /usr/sbin/autrace root:root 0750 /usr/sbin/augenrules root:root 0750 Set the correct permissions with the following command: > sudo chkstat --set /etc/permissions.local

b

The SUSE operating system must not disable syscall auditing.

CM-6 - Medium - CCI-000366 - V-217204 - SV-217204r646746_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-020199

Vuln IDs

V-217204
V-97227

Rule IDs

SV-217204r646746_rule
SV-106365

By default, the SUSE operating system includes the "-a task,never" audit rule as a default. This rule suppresses syscall auditing for all tasks started with this rule in effect. Because the audit daemon processes the "audit.rules" file from the top down, this rule supersedes all other defined syscall rules; therefore no syscall auditing can take place on the operating system.

Checks: C-18432r646744_chk

Verify syscall auditing has not been disabled: > sudo auditctl -l | grep -i "a task,never" If any results are returned, this is a finding. Verify the default rule "-a task,never" is not statically defined : > sudo grep -rv "^#" /etc/audit/rules.d/ | grep -i "a task,never" If any results are returned, this is a finding.

Fix: F-18430r646745_fix

Remove the "-a task,never" rule from the /etc/audit/rules.d/audit.rules file. The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.

AC-2 - Medium - CCI-001403 - V-217205 - SV-217205r854107_rule

RMF Control

AC-2

Severity

M

CCI

CCI-001403

Version

SLES-12-020200

Vuln IDs

V-217205
V-77315

Rule IDs

SV-217205r854107_rule
SV-92011

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Auditing of account creation mitigates this risk. To address access requirements, many SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000304-GPOS-00121, SRG-OS-000470-GPOS-00214, SRG-OS-000476-GPOS-00221

Checks: C-18433r369771_chk

Verify the SUSE operating system generates an audit record when all modifications occur to the "/etc/passwd" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep /etc/passwd /etc/audit/audit.rules -w /etc/passwd -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18431r369772_fix

Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/passwd" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/passwd -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/group.

AC-2 - Medium - CCI-000018 - V-217206 - SV-217206r854108_rule

RMF Control

AC-2

Severity

M

CCI

CCI-000018

Version

SLES-12-020210

Vuln IDs

V-217206
V-77317

Rule IDs

SV-217206r854108_rule
SV-92013

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Auditing of account creation mitigates this risk. To address access requirements, many SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Checks: C-18434r369774_chk

Verify the SUSE operating system generates an audit record when modifications occur to the "/etc/group" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep /etc/group /etc/audit/audit.rules -w /etc/group -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18432r369775_fix

Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/group" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/group -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.

AC-2 - Medium - CCI-001403 - V-217207 - SV-217207r854109_rule

RMF Control

AC-2

Severity

M

CCI

CCI-001403

Version

SLES-12-020220

Vuln IDs

V-217207
V-77319

Rule IDs

SV-217207r854109_rule
SV-92015

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Auditing of account creation mitigates this risk. To address access requirements, many SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Checks: C-18435r369777_chk

Verify the SUSE operating system generates an audit record when modifications occur to the "/etc/shadow" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep /etc/shadow /etc/audit/audit.rules -w /etc/shadow -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18433r369778_fix

Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/shadow" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/shadow -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.

AC-2 - Medium - CCI-000018 - V-217208 - SV-217208r854110_rule

RMF Control

AC-2

Severity

M

CCI

CCI-000018

Version

SLES-12-020230

Vuln IDs

V-217208
V-77321

Rule IDs

SV-217208r854110_rule
SV-92017

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Auditing of account creation mitigates this risk. To address access requirements, many SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Checks: C-18436r369780_chk

Verify the SUSE operating system generates an audit record when modifications occur to the "/etc/security/opasswd" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # grep /etc/security/opasswd /etc/audit/audit.rules -w /etc/security/opasswd -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18434r369781_fix

Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/security/opasswd" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/security/opasswd -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the privileged functions.

AU-7 - Low - CCI-001877 - V-217209 - SV-217209r854111_rule

RMF Control

AU-7

Severity

L

CCI

CCI-001877

Version

SLES-12-020240

Vuln IDs

V-217209
V-77323

Rule IDs

SV-217209r854111_rule
SV-92019

Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000337-GPOS-00129, SRG-OS-000348-GPOS-00136, SRG-OS-000349-GPOS-00137, SRG-OS-000350-GPOS-00138, SRG-OS-000351-GPOS-00139, SRG-OS-000352-GPOS-00140, SRG-OS-000353-GPOS-00141, SRG-OS-000354-GPOS-00142, SRG-OS-000358-GPOS-00145, SRG-OS-000359-GPOS-00146, SRG-OS-000365-GPOS-00152

Checks: C-18437r369783_chk

Verify the operating system audits the execution of privileged functions using the following command: # grep -iw execve /etc/audit/audit.rules -a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid -a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid -a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid -a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid If both the "b32" and "b64" audit rules for "SUID" files are not defined, this is a finding. If both the "b32" and "b64" audit rules for "SGID" files are not defined, this is a finding.

Fix: F-18435r369784_fix

Configure the operating system to audit the execution of privileged functions. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k setuid -a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k setuid -a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k setgid -a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k setgid The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the su command.

AU-12 - Medium - CCI-000172 - V-217210 - SV-217210r854112_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020250

Vuln IDs

V-217210
V-77325

Rule IDs

SV-217210r854112_rule
SV-92021

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18438r622358_chk

Verify the SUSE operating system generates an audit record for any use of the "su" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo egrep "\/usr\/bin\/su\s" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18436r622359_fix

Configure the SUSE operating system to generate an audit record for all uses of the "su" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the sudo command.

AU-12 - Low - CCI-000169 - V-217211 - SV-217211r854113_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020260

Vuln IDs

V-217211
V-77327

Rule IDs

SV-217211r854113_rule
SV-92023

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18439r622361_chk

Verify the SUSE operating system generates an audit record for any use of the "sudo" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -iw sudo /etc/audit/audit.rules -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-sudo If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18437r622362_fix

Configure the SUSE operating system to generate an audit record for all uses of the "sudo" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-sudo The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the chfn command.

AU-12 - Low - CCI-000172 - V-217212 - SV-217212r854114_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020280

Vuln IDs

V-217212
V-77331

Rule IDs

SV-217212r854114_rule
SV-92027

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18440r622364_chk

Verify the SUSE operating system generates an audit record for all uses of the "chfn" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i chfn /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chfn -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chfn If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18438r622365_fix

Configure the SUSE operating system to generate an audit record for all uses the "chfn" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chfn -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chfn The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the mount command.

AU-12 - Low - CCI-000169 - V-217213 - SV-217213r854115_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020290

Vuln IDs

V-217213
V-77333

Rule IDs

SV-217213r854115_rule
SV-92029

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18441r369795_chk

Verify the SUSE operating system generates an audit record for all uses of the "mount" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -iw mount /etc/audit/audit.rules -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount If both the "b32" and "b64" audit rules are not defined for the "mount" syscall, this is a finding. If all uses of the "mount" command are not being audited, this is a finding.

Fix: F-18439r369796_fix

Configure the SUSE operating system to generate an audit record for all uses the "mount" command. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount -a always,exit -F path=/usr/bin/mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the umount command.

AU-3 - Low - CCI-000130 - V-217214 - SV-217214r854116_rule

RMF Control

AU-3

Severity

L

CCI

Version

SLES-12-020300

Vuln IDs

V-217214
V-77335

Rule IDs

SV-217214r854116_rule
SV-92031

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18442r369798_chk

Verify the SUSE operating system generates an audit record for all uses of the "umount" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -iw umount /etc/audit/audit.rules -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount If both the "b32" and "b64" audit rules are not defined for the "umount" syscall, this is a finding.

Fix: F-18440r369799_fix

Configure the SUSE operating system to generate an audit record for all uses the "umount" command. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b32 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount -a always,exit -F arch=b64 -S umount2 -F auid>=1000 -F auid!=4294967295 -k privileged-umount The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the ssh-agent command.

AU-12 - Low - CCI-000169 - V-217215 - SV-217215r854117_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020310

Vuln IDs

V-217215
V-77337

Rule IDs

SV-217215r854117_rule
SV-92033

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18443r622367_chk

Verify the SUSE operating system generates an audit record for all uses of the "ssh-agent" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i ssh-agent /etc/audit/audit.rules -a always,exit -F path=/usr/bin/ssh-agent -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh-agent If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18441r622368_fix

Configure the SUSE operating system to generate an audit record for all uses the "ssh-agent" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/ssh-agent -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh-agent The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the ssh-keysign command.

AU-3 - Low - CCI-000130 - V-217216 - SV-217216r854118_rule

RMF Control

AU-3

Severity

L

CCI

Version

SLES-12-020320

Vuln IDs

V-217216
V-77339

Rule IDs

SV-217216r854118_rule
SV-92035

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18444r622370_chk

Verify the SUSE operating system generates an audit record for all uses of the "ssh-keysign" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i ssh-keysign /etc/audit/audit.rules -a always,exit -F path=/usr/lib/ssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh-keysign If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18442r622371_fix

Configure the SUSE operating system to generate an audit record for all uses the "ssh-keysign" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/lib/ssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh-keysign The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the kmod command.

AU-12 - Medium - CCI-000169 - V-217217 - SV-217217r854119_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020360

Vuln IDs

V-217217
V-77347

Rule IDs

SV-217217r854119_rule
SV-92043

Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The list of audited events is the set of events for which audits are to be generated. This set of events is typically a subset of the list of all events for which the system is capable of generating audit records. DoD has defined the following list of events for which the SUSE operating system will provide an audit record generation capability: 1) Successful and unsuccessful attempts to access, modify, or delete privileges, security objects, security levels, or categories of information (e.g., classification levels); 2) Access actions, such as successful and unsuccessful logon attempts, privileged activities or other system-level access, starting and ending time for user access to the system, concurrent logons from different workstations, successful and unsuccessful accesses to objects, all program initiations, and all direct access to the information system; 3) All account creations, modifications, disabling, and terminations; and 4) All kernel module load, unload, and restart actions. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18445r369807_chk

Verify the SUSE operating system generates an audit record for all uses of the "kmod" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep kmod /etc/audit/audit.rules -w /usr/bin/kmod -p x -k modules If the system is configured to audit the execution of the module management program "kmod", the command will return a line. If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18443r369808_fix

Configure the SUSE operating system to audit the execution of the module management program "kmod" by adding the following line to "/etc/audit/rules.d/audit.rules": -w /usr/bin/kmod -p x -k modules The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the setxattr, fsetxattr, lsetxattr, removexattr, fremovexattr, and lremovexattr syscalls.

AU-3 - Medium - CCI-000130 - V-217218 - SV-217218r854121_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020370

Vuln IDs

V-217218
V-77349

Rule IDs

SV-217218r854121_rule
SV-92045

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18446r854120_chk

Verify the SUSE operating system generates an audit record for all uses of the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep xattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls, this is a finding.

Fix: F-18444r809427_fix

Configure the SUSE operating system to generate an audit record for all uses of the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the chown, fchown, fchownat, and lchown syscalls.

AU-3 - Medium - CCI-000130 - V-217223 - SV-217223r854124_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020420

Vuln IDs

V-217223
V-77359

Rule IDs

SV-217223r854124_rule
SV-92055

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18451r854122_chk

Verify the SUSE operating system generates an audit record for all uses of the "chown", "fchown", "fchownat", and "lchown" syscalls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep chown /etc/audit/audit.rules -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chown", "fchown", "fchownat", "lchown" syscalls, this is a finding.

Fix: F-18449r854123_fix

Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the chmod, fchmod, and fchmodat system calls.

AU-3 - Medium - CCI-000130 - V-217227 - SV-217227r854126_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020460

Vuln IDs

V-217227
V-77367

Rule IDs

SV-217227r854126_rule
SV-92063

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18455r854125_chk

Verify the SUSE operating system generates an audit record for all uses of the "chmod", "fchmod" and "fchmodat" system calls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep chmod /etc/audit/audit.rules -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chmod", "fchmod", and "fchmodat" syscalls, this is a finding.

Fix: F-18453r809433_fix

Configure the SUSE operating system to generate an audit record for all uses of the "chmod", "fchmod", and "fchmodat" system calls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the creat, open, openat, open_by_handle_at, truncate, and ftruncate syscalls.

AU-3 - Medium - CCI-000130 - V-217230 - SV-217230r861099_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020490

Vuln IDs

V-217230
V-77373

Rule IDs

SV-217230r861099_rule
SV-92069

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18458r861097_chk

Verify the SUSE operating system generates an audit record for all uses of the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep 'open\|truncate\|creat' /etc/audit/audit.rules -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access If both the "b32" and "b64" audit rules are not defined for the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding.

Fix: F-18456r861098_fix

Configure the SUSE operating system to generate an audit record for all uses of the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access -a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k perm_access The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the passwd command.

AU-12 - Low - CCI-000172 - V-217236 - SV-217236r854130_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020550

Vuln IDs

V-217236
V-77385

Rule IDs

SV-217236r854130_rule
SV-92081

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18464r622373_chk

Verify the SUSE operating system generates an audit record for all uses of the "passwd" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i /usr/bin/passwd /etc/audit/audit.rules -a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18462r622374_fix

Configure the SUSE operating system to generate an audit record for all uses the "passwd" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the gpasswd command.

AU-3 - Low - CCI-000130 - V-217237 - SV-217237r854131_rule

RMF Control

AU-3

Severity

L

CCI

Version

SLES-12-020560

Vuln IDs

V-217237
V-77387

Rule IDs

SV-217237r854131_rule
SV-92083

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18465r622376_chk

Verify the SUSE operating system generates an audit record for all uses of the "gpasswd" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i gpasswd /etc/audit/audit.rules -a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-gpasswd If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18463r622377_fix

Configure the SUSE operating system to generate an audit record for all uses the "gpasswd" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-gpasswd The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for all uses of the newgrp command.

AU-12 - Low - CCI-000169 - V-217238 - SV-217238r854132_rule

RMF Control

AU-12

Severity

L

CCI

Version

SLES-12-020570

Vuln IDs

V-217238
V-77389

Rule IDs

SV-217238r854132_rule
SV-92085

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18466r622379_chk

Verify the SUSE operating system generates an audit record for all uses of the "newgrp" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i newgrp /etc/audit/audit.rules -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-newgrp If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18464r622380_fix

Configure the SUSE operating system to generate an audit record for all uses the "newgrp" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-newgrp The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

a

The SUSE operating system must generate audit records for a uses of the chsh command.

AU-3 - Low - CCI-000130 - V-217239 - SV-217239r854133_rule

RMF Control

AU-3

Severity

L

CCI

Version

SLES-12-020580

Vuln IDs

V-217239
V-77391

Rule IDs

SV-217239r854133_rule
SV-92087

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information. At a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18467r622382_chk

Verify the SUSE operating system generates an audit record for all uses of the "chsh" command. Check that the following command call is being audited by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep -i chsh /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chsh If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18465r622383_fix

Configure the SUSE operating system to generate an audit record for all uses the "chsh" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chsh The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/gshadow.

AU-12 - Medium - CCI-000172 - V-217240 - SV-217240r854134_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020590

Vuln IDs

V-217240
V-77393

Rule IDs

SV-217240r854134_rule
SV-92089

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply create a new account. Auditing of account creation mitigates this risk. To address access requirements, many SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Checks: C-18468r369876_chk

Verify the SUSE operating system generates an audit record when all modifications occur to the "/etc/gshadow" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep /etc/gshadow /etc/audit/audit.rules -w /etc/gshadow -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18466r369877_fix

Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/gshadow" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/gshadow -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the chmod command.

AU-3 - Medium - CCI-000130 - V-217241 - SV-217241r854135_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020600

Vuln IDs

V-217241
V-77395

Rule IDs

SV-217241r854135_rule
SV-92091

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18469r622385_chk

Verify the SUSE operating system generates an audit record for all uses of the "chmod" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i chmod /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chmod -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18467r622386_fix

Configure the SUSE operating system to generate an audit record for all uses of the "chmod" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chmod -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the setfacl command.

AU-12 - Medium - CCI-000169 - V-217242 - SV-217242r854136_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020610

Vuln IDs

V-217242
V-77397

Rule IDs

SV-217242r854136_rule
SV-92093

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18470r622388_chk

Verify the SUSE operating system generates an audit record for all uses of the "setfacl" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i setfacl /etc/audit/audit.rules -a always,exit -F path=/usr/bin/setfacl -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18468r622389_fix

Configure the SUSE operating system to generate an audit record for all uses of the "setfacl" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/setfacl -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the chacl command.

AU-3 - Medium - CCI-000130 - V-217243 - SV-217243r854137_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020620

Vuln IDs

V-217243
V-77399

Rule IDs

SV-217243r854137_rule
SV-92095

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18471r622391_chk

Verify the SUSE operating system generates an audit record for all uses of the "chacl" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i chacl /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chacl -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18469r622392_fix

Configure the SUSE operating system to generate an audit record for all uses of the "chacl" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chacl -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

Successful/unsuccessful attempts to modify categories of information (e.g., classification levels) must generate audit records.

AU-12 - Medium - CCI-000172 - V-217244 - SV-217244r854138_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020630

Vuln IDs

V-217244
V-77401

Rule IDs

SV-217244r854138_rule
SV-92097

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18472r622394_chk

Verify audit records are generated when successful/unsuccessful attempts to modify categories of information (e.g., classification levels) occur. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i 'chcon' /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18470r622395_fix

Configure the SUSE operating system to generate audit records when successful/unsuccessful attempts to modify categories of information (e.g., classification levels) occur. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the rm command.

AU-3 - Medium - CCI-000130 - V-217245 - SV-217245r854139_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020640

Vuln IDs

V-217245
V-77403

Rule IDs

SV-217245r854139_rule
SV-92099

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18473r622397_chk

Verify the SUSE operating system generates an audit record for all uses of the "rm" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i rm /etc/audit/audit.rules -a always,exit -F path=/usr/bin/rm -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18471r622398_fix

Configure the SUSE operating system to generate an audit record for all uses of the "rm" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/rm -F perm=x -F auid>=1000 -F auid!=4294967295 -k prim_mod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all modifications to the tallylog file must generate an audit record.

AU-12 - Medium - CCI-000172 - V-217246 - SV-217246r854140_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020650

Vuln IDs

V-217246
V-77405

Rule IDs

SV-217246r854140_rule
SV-92101

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215, SRG-OS-000473-GPOS-00218

Checks: C-18474r369894_chk

Verify the SUSE operating system generates an audit record when all modifications to the "tallylog" file occur. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i tallylog /etc/audit/audit.rules -w /var/log/tallylog -p wa -k logins If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18472r369895_fix

Configure the SUSE operating system to generate an audit record for any all modifications to the "tallylog" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /var/log/tallylog -p wa -k logins The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all modifications to the lastlog file.

AU-3 - Medium - CCI-000130 - V-217247 - SV-217247r854141_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020660

Vuln IDs

V-217247
V-77407

Rule IDs

SV-217247r854141_rule
SV-92103

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18475r369897_chk

Verify the SUSE operating system generates an audit record when all modifications to the "lastlog" file occur. Check that the following is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i lastlog /etc/audit/audit.rules -w /var/log/lastlog -p wa -k logins If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18473r369898_fix

Configure the SUSE operating system to generate an audit record for any all modifications to the "lastlog" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /var/log/lastlog -p wa -k logins The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the passmass command.

AU-12 - Medium - CCI-000172 - V-217248 - SV-217248r854142_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020670

Vuln IDs

V-217248
V-77409

Rule IDs

SV-217248r854142_rule
SV-92105

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18476r622400_chk

Verify the SUSE operating system generates an audit record for all uses of the "passmass" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i passmass /etc/audit/audit.rules -a always,exit -F path=/usr/bin/passmass -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passmass If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18474r622401_fix

Configure the SUSE operating system to generate an audit record for all uses of the "passmass" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/passmass -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passmass The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the unix_chkpwd command.

AU-3 - Medium - CCI-000130 - V-217249 - SV-217249r854143_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020680

Vuln IDs

V-217249
V-77411

Rule IDs

SV-217249r854143_rule
SV-92107

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18477r622403_chk

Verify an audit record is generated for all uses of the "unix_chkpwd" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo egrep -i '(unix_chkpwd|unix2_chkpwd)' /etc/audit/audit.rules -a always,exit -F path=/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-unix-chkpwd -a always,exit -F path=/sbin/unix2_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-unix2-chkpwd If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18475r622404_fix

Configure the SUSE operating system to generate an audit record for all uses of the "unix_chkpwd" and "unix2_chkpwd" commands. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-unix-chkpwd -a always,exit -F path=/sbin/unix2_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-unix2-chkpwd The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the chage command.

AU-12 - Medium - CCI-000172 - V-217250 - SV-217250r854144_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020690

Vuln IDs

V-217250
V-77413

Rule IDs

SV-217250r854144_rule
SV-92109

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18478r622406_chk

Verify an audit record is generated for all uses of the "chage" command. Perform the verification by running the following command: Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i 'chage' /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chage If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18476r622407_fix

Configure the SUSE operating system to generate an audit record for all uses of the "chage" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-chage The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the usermod command.

AU-3 - Medium - CCI-000130 - V-217251 - SV-217251r854145_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020700

Vuln IDs

V-217251
V-77415

Rule IDs

SV-217251r854145_rule
SV-92111

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18479r622409_chk

Verify an audit record is generated for all uses of the "usermod" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i 'usermod' /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/usermod -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-usermod If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18477r622410_fix

Configure the SUSE operating system to generate an audit record for all uses of the "usermod" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/sbin/usermod -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-usermod The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the crontab command.

AU-12 - Medium - CCI-000172 - V-217252 - SV-217252r854146_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020710

Vuln IDs

V-217252
V-77417

Rule IDs

SV-217252r854146_rule
SV-92113

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18480r622412_chk

Verify an audit record is generated for all uses of the "crontab" command. Check for the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i 'crontab' /etc/audit/audit.rules -a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-crontab If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18478r622413_fix

Configure the SUSE operating system to generate an audit record for all uses of the "crontab" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-crontab The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the pam_timestamp_check command.

AU-3 - Medium - CCI-000130 - V-217253 - SV-217253r854147_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020720

Vuln IDs

V-217253
V-77419

Rule IDs

SV-217253r854147_rule
SV-92115

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18481r622415_chk

Verify an audit record is generated for all uses of the "pam_timestamp_check" command. Check for the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i 'pam_timestamp_check' /etc/audit/audit.rules -a always,exit -F path=/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-pam_timestamp_check If the command does not return any output or the returned line is commented out, this is a finding.

Fix: F-18479r622416_fix

Configure the SUSE operating system to generate an audit record for all uses of the "pam_timestamp_check" command. Add or update the following rules in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F path=/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-pam_timestamp_check The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the delete_module command.

AU-12 - Medium - CCI-000169 - V-217254 - SV-217254r854148_rule

RMF Control

AU-12

Severity

M

CCI

Version

SLES-12-020730

Vuln IDs

V-217254
V-77421

Rule IDs

SV-217254r854148_rule
SV-92117

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18482r369918_chk

Verify the SUSE operating system generates an audit record for all uses of the "delete_module" command. Check that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i delete_module /etc/audit/audit.rules -a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=4294967295 -k unload_module -a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=4294967295 -k unload_module If both the "b32" and "b64" audit rules are not defined for the "unload_module" syscall, this is a finding.

Fix: F-18480r369919_fix

Configure the SUSE operating system to generate an audit record for all uses of the "delete_module" command. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=4294967295 -k unload_module -a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=4294967295 -k unload_module The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all uses of the init_module and finit_module syscalls.

AU-3 - Medium - CCI-000130 - V-217255 - SV-217255r854150_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020740

Vuln IDs

V-217255
V-77423

Rule IDs

SV-217255r854150_rule
SV-92119

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary since these affect performance. The more rules, the bigger the performance hit. The performance is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18483r854149_chk

Verify the SUSE operating system generates an audit record for all uses of the "init_module" and "finit_module" syscalls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep init_module /etc/audit/audit.rules -a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=4294967295 -k moduleload -a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=4294967295 -k moduleload If both the "b32" and "b64" audit rules are not defined for the "init_module" and "finit_module" syscalls, this is a finding.

Fix: F-18481r809439_fix

Configure the SUSE operating system to generate an audit record for all uses of the "init_module" and "finit_module" syscalls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=4294967295 -k moduleload -a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=4294967295 -k moduleload The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service

b

The SUSE operating system must generate audit records for all modifications to the faillog file.

AU-3 - Medium - CCI-000130 - V-217257 - SV-217257r854151_rule

RMF Control

AU-3

Severity

M

CCI

Version

SLES-12-020760

Vuln IDs

V-217257
V-77427

Rule IDs

SV-217257r854151_rule
SV-92123

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215

Checks: C-18485r369927_chk

Verify the SUSE operating system generates an audit record when all modifications to the "faillog" file occur. Check that the following is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -i faillog /etc/audit/audit.rules -w /var/log/faillog -p wa -k logins If the command does not return a line, or the line is commented out, this is a finding.

Fix: F-18483r369928_fix

Configure the SUSE operating system to generate an audit record for any all modifications to the "faillog" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /var/log/faillog -p wa -k logins The audit daemon must be restarted for the changes to take effect. # sudo systemctl restart auditd.service

b

The SUSE operating system must not have the telnet-server package installed.

IA-5 - Medium - CCI-000197 - V-217258 - SV-217258r877396_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000197

Version

SLES-12-030000

Vuln IDs

V-217258
V-77429

Rule IDs

SV-217258r877396_rule
SV-92125

It is detrimental for SUSE operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. SUSE operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions and functions). Examples of nonessential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but which cannot be disabled. Satisfies: SRG-OS-000074-GPOS-00042, SRG-OS-000095-GPOS-00049

Checks: C-18486r369930_chk

Verify the telnet-server package is not installed on the SUSE operating system. Check that the telnet-server package is not installed on the SUSE operating system by running the following command: # zypper se telnet-server If the telnet-server package is installed, this is a finding.

Fix: F-18484r369931_fix

Remove the telnet-server package from the SUSE operating system by running the following command: # sudo zypper remove telnet-server

b

The SUSE operating system file /etc/gdm/banner must contain the Standard Mandatory DoD Notice and Consent banner text.

AC-8 - Medium - CCI-000050 - V-217260 - SV-217260r603262_rule

RMF Control

AC-8

Severity

M

CCI

CCI-000050

Version

SLES-12-030020

Vuln IDs

V-217260
V-77433

Rule IDs

SV-217260r603262_rule
SV-92129

The banner must be acknowledged by the user prior to allowing the user access to the SUSE operating system. This provides assurance that the user has seen the message and accepted the conditions for access. If the consent banner is not acknowledged by the user, DoD will not be in compliance with system use notifications required by law. To establish acceptance of the application usage policy, a click-through banner at system logon is required. The system must prevent further activity until the user executes a positive action to manifest agreement by clicking on a box indicating "OK".

Checks: C-18488r369936_chk

Verify the SUSE operating system file "/etc/gdm/banner" contains the Standard Mandatory DoD Notice and Consent Banner text by running the following command: # more /etc/gdm/banner If the file does not contain the following text, this is a finding. "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Fix: F-18486r369937_fix

Configure the SUSE operating system file "/etc/gdm/banner" to contain the Standard Mandatory DoD Notice and Consent Banner by running the following commands: # sudo vi /etc/gdm/banner Add the following information to the file: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

b

The SUSE operating system must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services as defined in the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL) and vulnerability assessments.

CM-7 - Medium - CCI-000382 - V-217261 - SV-217261r854152_rule

RMF Control

CM-7

Severity

M

CCI

CCI-000382

Version

SLES-12-030030

Vuln IDs

V-217261
V-77435

Rule IDs

SV-217261r854152_rule
SV-92131

To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. SUSE operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the SUSE operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or address authorized quality-of-life issues. Satisfies: SRG-OS-000096-GPOS-00050, SRG-OS-000297-GPOS-00115, SRG-OS-000480-GPOS-00231, SRG-OS-000480-GPOS-00232

Checks: C-18489r369939_chk

Verify the SUSE operating system is configured to prohibit or restrict the use of functions, ports, protocols, and/or services as defined in the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL) and vulnerability assessments. Check that the "SuSEfirewall2.service" is enabled and running by running the following command: # systemctl status SuSEfirewall2.service * SuSEfirewall2.service - SuSEfirewall2 phase 2 Loaded: loaded (/usr/lib/systemd/system/SuSEfirewall2.service; enabled; vendor preset: disabled) Active: active (exited) since Thu 2017-03-09 17:33:29 UTC; 6 days ago Main PID: 2533 (code=exited, status=0/SUCCESS) Tasks: 0 (limit: 512) Memory: 0B CPU: 0 CGroup: /system.slice/SuSEfirewall2.service If the service is not enabled, this is a finding. If the service is not active, this is a finding. Check the firewall configuration for any unnecessary or prohibited functions, ports, protocols, and/or services by running the following command: # grep ^FW_ /etc/sysconfig/SuSEfirewall2 Ask the System Administrator for the site or program PPSM Component Local Services Assessment (Component Local Services Assessment (CLSA). Verify the services allowed by the firewall match the PPSM CLSA. If there are any additional ports, protocols, or services that are not included in the PPSM CLSA, this is a finding. If there are any ports, protocols, or services that are prohibited by the PPSM CAL, this is a finding.

Fix: F-18487r369940_fix

Configure the SUSE operating system is configured to prohibit or restrict the use of functions, ports, protocols, and/or services as defined in the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL) and vulnerability assessments. Add/modify /etc/sysconfig/SuSEfirewall2 file to comply with the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL). Enable the "SuSEfirewall2.service" by running the following command: # systemctl enable SuSEfirewall2.service Start the "SuSEfirewall2.service" by running the following command: # systemctl start SuSEfirewall2.service

c

SuSEfirewall2 must protect against or limit the effects of Denial-of-Service (DoS) attacks on the SUSE operating system by implementing rate-limiting measures on impacted network interfaces.

SC-5 - High - CCI-002385 - V-217262 - SV-217262r854153_rule

RMF Control

SC-5

Severity

H

CCI

CCI-002385

Version

SLES-12-030040

Vuln IDs

V-217262
V-77437

Rule IDs

SV-217262r854153_rule
SV-92133

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. This requirement addresses the configuration of the SUSE operating system to mitigate the impact on system availability of DoS attacks that have occurred or are ongoing. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.

Checks: C-18490r369942_chk

Verify "SuSEfirewall2" is configured to protect the SUSE operating system against or limit the effects of DoS attacks. Run the following command: # grep -i fw_services_accept_ext /etc/sysconfig/SuSEfirewall2 FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh" If the "FW_SERVICES_ACCEPT_EXT" rule does not contain both the "hitcount" and "blockseconds" parameters, this is a finding.

Fix: F-18488r369943_fix

Configure "SuSEfirewall2" to protect the SUSE operating system against or limit the effects of DoS attacks by implementing rate-limiting measures on impacted network interfaces. Add or replace the following line in "/etc/sysconfig/SuSEfirewall2": FW_SERVICES_ACCEPT_EXT="0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh" The firewall must be restarted in order for the changes to take effect. # sudo systemctl restart SuSEfirewall2.service

b

The SUSE operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting access via SSH.

AC-8 - Medium - CCI-001388 - V-217263 - SV-217263r603262_rule

RMF Control

AC-8

Severity

M

CCI

CCI-001388

Version

SLES-12-030050

Vuln IDs

V-217263
V-77439

Rule IDs

SV-217263r603262_rule
SV-92135

Display of a standardized and approved use notification before granting access to the SUSE operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for SUSE operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Satisfies: SRG-OS-000228-GPOS-00088

Checks: C-18491r369945_chk

Verify the SUSE operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the system via SSH. Check the issue file to verify that it contains one of the DoD required banners. If it does not, this is a finding. # more /etc/issue The output must display the following DoD-required banner text. "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." If the output does not display the banner text, this is a finding. Check the banner setting for sshd_config: # sudo grep "Banner" /etc/ssh/sshd_config The output must show the value of "Banner" set to "/etc/issue". An example is shown below: # sudo grep "Banner" /etc/ssh/sshd_config Banner /etc/issue If it does not, this is a finding.

Fix: F-18489r369946_fix

Configure the SUSE operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system by running the following commands: Edit the "sshd_config" file and edit the Banner flag to be the following: Banner /etc/issue/ Restart the sshd daemon: # sudo systemctl restart sshd.service To configure the system logon banner, edit the "/etc/issue" file. Replace the default text inside with the Standard Mandatory DoD banner text: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

c

All networked SUSE operating systems must have and implement SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission.

SC-8 - High - CCI-002418 - V-217264 - SV-217264r916422_rule

RMF Control

SC-8

Severity

H

CCI

CCI-002418

Version

SLES-12-030100

Vuln IDs

V-217264
V-77441

Rule IDs

SV-217264r916422_rule
SV-92137

Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, logical means (cryptography) do not have to be employed, and vice versa. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190

Checks: C-18492r369948_chk

Note: If the system is not networked this requirement is Not Applicable. Verify that the SUSE operating system implements SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission. Check that the OpenSSH package is installed on the SUSE operating system with the following command: # zypper se openssh S | Name | Summary | Type --+---------------- --+------------------------------------------------------+-------- i | openssh | Secure Shell Client and Server (Remote L-> | package If the OpenSSH package is not installed, this is a finding. Check that the OpenSSH service active on the SUSE operating system with the following command: # systemctl status sshd.service | grep -i "active:" Active: active (running) since Thu 2017-01-12 15:03:38 UTC; 1 months 4 days ago If OpenSSH service is not active, this is a finding.

Fix: F-18490r369949_fix

Note: If the system is not networked this requirement is Not Applicable. Configure the SUSE operating system to implement SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission. Install the OpenSSH package on the SUSE operating system with the following command: # sudo zypper in openssh Enable the OpenSSH service to start automatically on reboot with the following command: # sudo systemctl enable sshd.service For the changes to take effect immediately, start the service with the following command: # sudo systemctl restart sshd.service

b

The SUSE operating system must log SSH connection attempts and failures to the server.

AC-17 - Medium - CCI-000067 - V-217265 - SV-217265r603262_rule

RMF Control

AC-17

Severity

M

CCI

CCI-000067

Version

SLES-12-030110

Vuln IDs

V-217265
V-77443

Rule IDs

SV-217265r603262_rule
SV-92139

Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Automated monitoring of remote access sessions allows organizations to detect cyber attacks and also ensure ongoing compliance with remote access policies by auditing connection activities of remote access capabilities, such as Remote Desktop Protocol (RDP), on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets).

Checks: C-18493r369951_chk

Verify SSH is configured to verbosely log connection attempts and failed logon attempts to the SUSE operating system. Check that the SSH daemon configuration verbosely logs connection attempts and failed logon attempts to the server with the following command: # sudo grep -i loglevel /etc/ssh/sshd_config The output message must contain the following text: LogLevel VERBOSE If "LogLevel" is not set to "VERBOSE" or "INFO", the LogLevel keyword is missing, or the line is commented out, this is a finding.

Fix: F-18491r369952_fix

Configure SSH to verbosely log connection attempts and failed logon attempts to the SUSE operating system. Add or update the following line in the "/etc/ssh/sshd_config" file: LogLevel VERBOSE The SSH service will need to be restarted in order for the changes to take effect: # systemctl restart sshd

b

The SUSE operating system must display the date and time of the last successful account logon upon an SSH logon.

AC-9 - Medium - CCI-000052 - V-217266 - SV-217266r858541_rule

RMF Control

AC-9

Severity

M

CCI

CCI-000052

Version

SLES-12-030130

Vuln IDs

V-217266
V-77447

Rule IDs

SV-217266r858541_rule
SV-92143

Providing users with feedback on when account accesses via SSH last occurred facilitates user recognition and reporting of unauthorized account use.

Checks: C-18494r369954_chk

Verify all remote connections via SSH to the SUSE operating system display feedback on when account accesses last occurred. Check that "PrintLastLog" keyword in the sshd daemon configuration file is used and set to "yes" with the following command: # sudo grep -i printlastlog /etc/ssh/sshd_config PrintLastLog yes If the "PrintLastLog" keyword is set to "no", is missing, or is commented out, this is a finding.

Fix: F-18492r369955_fix

Configure the SUSE operating system to provide users with feedback on when account accesses last occurred. Add or edit the following lines in the "/etc/ssh/sshd_config" file: PrintLastLog yes

b

The SUSE operating system must deny direct logons to the root account using remote access via SSH.

IA-2 - Medium - CCI-000770 - V-217267 - SV-217267r603262_rule

RMF Control

IA-2

Severity

M

CCI

CCI-000770

Version

SLES-12-030140

Vuln IDs

V-217267
V-77449

Rule IDs

SV-217267r603262_rule
SV-92145

To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated. A group authenticator is a generic account used by multiple individuals. Use of a group authenticator alone does not uniquely identify individual users. Examples of the group authenticator is the UNIX OS "root" user account, the Windows "Administrator" account, the "sa" account, or a "helpdesk" account. For example, the UNIX and Windows SUSE operating systems offer a "switch user" capability, allowing users to authenticate with their individual credentials and, when needed, "switch" to the administrator role. This method provides for unique individual authentication prior to using a group authenticator. Users (and any processes acting on behalf of users) need to be uniquely identified and authenticated for all accesses other than those accesses explicitly identified and documented by the organization, which outlines specific user actions that can be performed on the SUSE operating system without identification or authentication. Requiring individuals to be authenticated with an individual authenticator prior to using a group authenticator allows for traceability of actions, as well as adding an additional level of protection of the actions that can be taken with group account knowledge.

Checks: C-18495r369957_chk

Verify the SUSE operating system denies direct logons to the root account using remote access via SSH. Check that SSH denies any user trying to log on directly as root with the following command: # sudo grep -i permitrootlogin /etc/ssh/sshd_config PermitRootLogin no If the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, this is a finding.

Fix: F-18493r369958_fix

Configure the SUSE operating system to deny direct logons to the root account using remote access via SSH. Edit the appropriate "/etc/ssh/sshd_config" file, add or uncomment the line for "PermitRootLogin" and set its value to "no" (this file may be named differently or be in a different location): PermitRootLogin no

c

The SUSE operating system must not allow automatic logon via SSH.

CM-6 - High - CCI-000366 - V-217268 - SV-217268r877377_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-030150

Vuln IDs

V-217268
V-77451

Rule IDs

SV-217268r877377_rule
SV-92147

Failure to restrict system access via SSH to authenticated users negatively impacts SUSE operating system security.

Checks: C-18496r369960_chk

Verify the SUSE operating system disables automatic logon via SSH. Check that automatic logon via SSH is disabled with the following command: # sudo grep -i "permitemptypasswords" /etc/ssh/sshd_config PermitEmptyPasswords no If "PermitEmptyPasswords" is not set to "no", is missing completely, or is commented out, this is a finding.

Fix: F-18494r369961_fix

Configure the SUSE operating system disables automatic logon via SSH. Add or edit the following line in the "/etc/ssh/sshd_config" file: PermitEmptyPasswords no

b

The SUSE operating system must not allow users to override SSH environment variables.

CM-6 - Medium - CCI-000366 - V-217269 - SV-217269r877377_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030151

Vuln IDs

V-217269
V-99011

Rule IDs

SV-217269r877377_rule
SV-108115

SSH environment options potentially allow users to bypass access restriction in some configurations.

Checks: C-18497r369963_chk

Verify the SUSE operating system disables unattended via SSH. Check that unattended logon via SSH is disabled with the following command: # sudo grep -i "permituserenvironment" /etc/ssh/sshd_config PermitUserEnvironment no If the "PermitUserEnvironment" keyword is not set to "no", is missing completely, or is commented out, this is a finding.

Fix: F-18495r369964_fix

Configure the SUSE operating system disables unattended logon via SSH. Add or edit the following lines in the "/etc/ssh/sshd_config" file: PermitUserEnvironment no

b

The SUSE operating system must implement DoD-approved encryption to protect the confidentiality of SSH remote connections.

IA-7 - Medium - CCI-000803 - V-217270 - SV-217270r877398_rule

RMF Control

IA-7

Severity

M

CCI

Version

SLES-12-030170

Vuln IDs

V-217270
V-77455

Rule IDs

SV-217270r877398_rule
SV-92151

Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information. The system will attempt to use the first cipher presented by the client that matches the server list. Listing the values "strongest to weakest" is a method to ensure the use of the strongest cipher available to secure the SSH connection. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173

Checks: C-18498r622418_chk

Verify that the SUSE operating system implements DoD-approved encryption to protect the confidentiality of SSH remote connections. Check the SSH daemon configuration for allowed ciphers with the following command: # sudo grep -i ciphers /etc/ssh/sshd_config | grep -v '^#' Ciphers aes256-ctr,aes192-ctr,aes128-ctr If any ciphers other than "aes256-ctr", "aes192-ctr", or "aes128-ctr" are listed, the order differs from the example above, the "Ciphers" keyword is missing, or the returned line is commented out, this is a finding.

Fix: F-18496r622419_fix

Edit the SSH daemon configuration (/etc/ssh/sshd_config) and remove any ciphers not starting with "aes" and remove any ciphers ending with "cbc". If necessary, add a "Ciphers" line: Ciphers aes256-ctr,aes192-ctr,aes128-ctr Restart the SSH daemon: # sudo systemctl restart sshd.service

b

The SUSE operating system SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.

MA-4 - Medium - CCI-000877 - V-217271 - SV-217271r877395_rule

RMF Control

MA-4

Severity

M

CCI

CCI-000877

Version

SLES-12-030180

Vuln IDs

V-217271
V-77457

Rule IDs

SV-217271r877395_rule
SV-92153

Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. The system will attempt to use the first hash presented by the client that matches the server list. Listing the values "strongest to weakest" is a method to ensure the use of the strongest hash available to secure the SSH connection. Satisfies: SRG-OS-000125-GPOS-00065, SRG-OS-000394-GPOS-00174

Checks: C-18499r622421_chk

Verify the SUSE operating system SSH daemon is configured to only use MACs that employ FIPS 140-2 approved hashes. Check that the SSH daemon is configured to only use MACs that employ FIPS 140-2 approved hashes with the following command: # sudo grep -i macs /etc/ssh/sshd_config MACs hmac-sha2-512,hmac-sha2-256 If any hashes other than "hmac-sha2-512" or "hmac-sha2-256" are listed, the order differs from the example above, they are missing, or the returned line is commented out, this is a finding.

Fix: F-18497r622422_fix

Configure the SUSE operating system SSH daemon to only use MACs that employ FIPS 140-2 approved hashes. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "MACs" keyword and set its value to "hmac-sha2-512" and/or "hmac-sha2-256" (The file might be named differently or be in a different location): MACs hmac-sha2-512,hmac-sha2-256

b

The SUSE operating system SSH daemon must be configured with a timeout interval.

MA-4 - Medium - CCI-000879 - V-217272 - SV-217272r854157_rule

RMF Control

MA-4

Severity

M

CCI

CCI-000879

Version

SLES-12-030190

Vuln IDs

V-217272
V-77459

Rule IDs

SV-217272r854157_rule
SV-92155

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, deallocating associated TCP/IP address/port pairs at the SUSE operating system level, and deallocating networking assignments at the application level if multiple application sessions are using a single SUSE operating system-level network connection. This does not mean that the SUSE operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000126-GPOS-00066, SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109

Checks: C-18500r369972_chk

Verify the SUSE operating system SSH daemon is configured to timeout idle sessions. Check that the "ClientAliveInterval" parameter is set to a value of "600" with the following command: # sudo grep -i clientalive /etc/ssh/sshd_config ClientAliveInterval 600 If "ClientAliveInterval" is not set to "600" in "/etc/ssh/sshd_config", this is a finding.

Fix: F-18498r369973_fix

Configure the SUSE operating system SSH daemon to timeout idle sessions. Add or modify (to match exactly) the following line in the "/etc/ssh/sshd_config" file: ClientAliveInterval 600 The SSH daemon must be restarted in order for any changes to take effect.

b

The SUSE operating system for all network connections associated with SSH traffic must immediately terminate at the end of the session or after 10 minutes of inactivity.

SC-10 - Medium - CCI-001133 - V-217273 - SV-217273r854158_rule

RMF Control

SC-10

Severity

M

CCI

CCI-001133

Version

SLES-12-030191

Vuln IDs

V-217273
V-81801

Rule IDs

SV-217273r854158_rule
SV-96515

Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections that are associated with communications sessions (i.e., network disconnect). A logical session (for local, network, and remote access) is initiated whenever a user (or process acting on behalf of a user) accesses an organizational information system. Such user sessions can be terminated (and thus terminate user access) without terminating network sessions. Session termination terminates all processes associated with a user's logical session except those processes that are specifically created by the user (i.e., session owner) to continue after the session is terminated. Conditions or trigger events requiring automatic session termination can include, for example, organization-defined periods of user inactivity, targeted responses to certain types of incidents, and time-of-day restrictions on information system use. This capability is typically reserved for specific SUSE operating system functionality where the system owner, data owner, or organization requires additional assurance.

Checks: C-18501r622424_chk

Verify that all network connections associated with SSH traffic are automatically terminated at the end of the session or after "10" minutes of inactivity. Check that the "ClientAliveCountMax" variable is set to a value of "1" or less by performing the following command: # sudo grep -i clientalive /etc/ssh/sshd_config ClientAliveInterval 600 ClientAliveCountMax 1 If "ClientAliveCountMax" does not exist or "ClientAliveCountMax" is not set to a value of "1" in "/etc/ssh/sshd_config", or the line is commented out, this is a finding.

Fix: F-18499r369976_fix

Configure the SUSE operating system to automatically terminate all network connections associated with SSH traffic at the end of a session or after a "10" minute period of inactivity. Modify or append the following lines in the "/etc/ssh/sshd_config" file: ClientAliveCountMax 1 In order for the changes to take effect, the SSH daemon must be restarted. # sudo systemctl restart sshd.service

b

The SUSE operating system SSH daemon must be configured to not allow authentication using known hosts authentication.

CM-6 - Medium - CCI-000366 - V-217274 - SV-217274r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030200

Vuln IDs

V-217274
V-77461

Rule IDs

SV-217274r603262_rule
SV-92157

Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.

Checks: C-18502r369978_chk

Verify the SUSE operating system SSH daemon is configured to not allow authentication using known hosts authentication. To determine how the SSH daemon's "IgnoreUserKnownHosts" option is set, run the following command: # sudo grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config IgnoreUserKnownHosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Fix: F-18500r369979_fix

Configure the SUSE operating system SSH daemon to not allow authentication using known hosts authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes": IgnoreUserKnownHosts yes

b

The SUSE operating system SSH daemon public host key files must have mode 0644 or less permissive.

CM-6 - Medium - CCI-000366 - V-217275 - SV-217275r646750_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030210

Vuln IDs

V-217275
V-77463

Rule IDs

SV-217275r646750_rule
SV-92159

If a public host key file is modified by an unauthorized user, the SSH service may be compromised.

Checks: C-18503r646748_chk

Verify the SUSE operating system SSH daemon public host key files have mode "0644" or less permissive. Note: SSH public key files may be found in other directories on the system depending on the installation. The following command will find all SSH public key files on the system: > find /etc/ssh -name 'ssh_host*key.pub' -exec stat -c "%a %n" {} \; 644 /etc/ssh/ssh_host_rsa_key.pub 644 /etc/ssh/ssh_host_dsa_key.pub 644 /etc/ssh/ssh_host_ecdsa_key.pub 644 /etc/ssh/ssh_host_ed25519_key.pub If any file has a mode more permissive than "0644", this is a finding.

Fix: F-18501r646749_fix

Configure the SUSE operating system SSH daemon public host key files have mode "0644" or less permissive. Note: SSH public key files may be found in other directories on the system depending on the installation. Change the mode of public host key files under "/etc/ssh" to "0644" with the following command: > sudo chmod 0644 /etc/ssh/ssh_host*key.pub

b

The SUSE operating system SSH daemon private host key files must have mode 0640 or less permissive.

CM-6 - Medium - CCI-000366 - V-217276 - SV-217276r880919_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030220

Vuln IDs

V-217276
V-77465

Rule IDs

SV-217276r880919_rule
SV-92161

If an unauthorized user obtains the private SSH host key file, the host could be impersonated.

Checks: C-18504r880917_chk

Verify the SUSE operating system SSH daemon private host key files have mode "0640" or less permissive. The following command will find all SSH private key files on the system: > sudo find / -name '*ssh_host*key' -exec ls -lL {} \; Check the mode of the private host key files under "/etc/ssh" file with the following command: > find /etc/ssh -name 'ssh_host*key' -exec stat -c "%a %n" {} \; 640 /etc/ssh/ssh_host_rsa_key 640 /etc/ssh/ssh_host_dsa_key 640 /etc/ssh/ssh_host_ecdsa_key 640 /etc/ssh/ssh_host_ed25519_key If any file has a mode more permissive than "0640", this is a finding.

Fix: F-18502r880918_fix

Configure the mode of the SUSE operating system SSH daemon private host key files under "/etc/ssh" to "0640" with the following command: > sudo chmod 0640 /etc/ssh/ssh_host*key

b

The SUSE operating system SSH daemon must perform strict mode checking of home directory configuration files.

CM-6 - Medium - CCI-000366 - V-217277 - SV-217277r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030230

Vuln IDs

V-217277
V-77467

Rule IDs

SV-217277r603262_rule
SV-92163

If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.

Checks: C-18505r369987_chk

Verify the SUSE operating system SSH daemon performs strict mode checking of home directory configuration files. Check that the SSH daemon performs strict mode checking of home directory configuration files with the following command: # sudo grep -i strictmodes /etc/ssh/sshd_config StrictModes yes If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.

Fix: F-18503r369988_fix

Configure the SUSE operating system SSH daemon performs strict mode checking of home directory configuration files. Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" and set the value to "yes": StrictModes yes

b

The SUSE operating system SSH daemon must use privilege separation.

CM-6 - Medium - CCI-000366 - V-217278 - SV-217278r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030240

Vuln IDs

V-217278
V-77469

Rule IDs

SV-217278r603262_rule
SV-92165

SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.

Checks: C-18506r369990_chk

Determine the version of SSH using the following command: # ssh -V OpenSSH_7.9p1 If the version of SSH is 7.5 or newer, this is Not Applicable. Verify the SUSE operating system SSH daemon is configured to use privilege separation. Check that the SUSE operating system SSH daemon performs privilege separation with the following command: # sudo grep -i usepriv /etc/ssh/sshd_config UsePrivilegeSeparation yes If the "UsePrivilegeSeparation" keyword is not set to "yes" or "sandbox", is missing, or the returned line is commented out, this is a finding.

Fix: F-18504r369991_fix

Configure the SUSE operating system SSH daemon is configured to use privilege separation. Uncomment the "UsePrivilegeSeparation" keyword in "/etc/ssh/sshd_config" and set the value to "yes" or "sandbox": UsePrivilegeSeparation yes

b

The SUSE operating system SSH daemon must not allow compression or must only allow compression after successful authentication.

CM-6 - Medium - CCI-000366 - V-217279 - SV-217279r880925_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030250

Vuln IDs

V-217279
V-77471

Rule IDs

SV-217279r880925_rule
SV-92167

If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges.

Checks: C-18507r880923_chk

Note: If the installed version of OpenSSH is 7.4 or above, this requirement is not applicable. Verify the SUSE operating system SSH daemon performs compression after a user successfully authenticates. Check that the SSH daemon performs compression after a user successfully authenticates with the following command: # sudo grep -i compression /etc/ssh/sshd_config Compression delayed If the "Compression" keyword is set to "yes", is missing, or the returned line is commented out, this is a finding.

Fix: F-18505r880924_fix

Configure the SUSE operating system SSH daemon performs compression after a user successfully authenticates. Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" on the system and set the value to "delayed" or "no": Compression no

b

The SUSE operating system SSH daemon must disable forwarded remote X connections for interactive users, unless to fulfill documented and validated mission requirements.

CM-6 - Medium - CCI-000366 - V-217280 - SV-217280r603964_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030260

Vuln IDs

V-217280
V-77473

Rule IDs

SV-217280r603964_rule
SV-92169

The security risk of using X11 forwarding is that the client's X11 display server may be exposed to attack when the SSH client requests forwarding. A system administrator may have a stance in which they want to protect clients that may expose themselves to attack by unwittingly requesting X11 forwarding, which can warrant a ''no'' setting. X11 forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the user's X11 authorization database) can access the local X11 display through the forwarded connection. An attacker may then be able to perform activities such as keystroke monitoring if the ForwardX11Trusted option is also enabled. If X11 services are not required for the system's intended function, they should be disabled or restricted as appropriate to the system’s needs.

Checks: C-18508r622426_chk

Determine if X11Forwarding is disabled with the following command: # sudo grep -i x11forwarding /etc/ssh/sshd_config X11Forwarding no If the "X11Forwarding" keyword is set to "yes" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, is missing, or is commented out, this is a finding.

Fix: F-18506r622427_fix

Configure the SUSE operating system SSH daemon to disable forwarded X connections for interactive users. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "no" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor): X11Forwarding no

b

The SUSE operating system clock must, for networked systems, be synchronized to an authoritative DoD time source at least every 24 hours.

AU-8 - Medium - CCI-002046 - V-217281 - SV-217281r877038_rule

RMF Control

AU-8

Severity

M

CCI

CCI-002046

Version

SLES-12-030300

Vuln IDs

V-217281
V-77475

Rule IDs

SV-217281r877038_rule
SV-92171

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144

Checks: C-18509r646754_chk

Verify the SUSE operating system clock must be configured to synchronize to an authoritative DoD time source when the time difference is greater than one second. Check that the SUSE operating system clock must be configured to synchronize to an authoritative DoD time source when the time difference is greater than one second with the following command: > sudo grep maxpoll /etc/ntp.conf server 0.us.pool.ntp.mil maxpoll 16 If nothing is returned or "maxpoll" is greater than "16", or is commented out, this is a finding. Verify the "ntp.conf" file is configured to an authoritative DoD time source by running the following command: > sudo grep -i server /etc/ntp.conf server 0.us.pool.ntp.mil If the parameter "server" is not set or is not set to an authoritative DoD time source, this is a finding.

Fix: F-18507r370000_fix

Configure the SUSE operating system clock must be configured to synchronize to an authoritative DoD time source when the time difference is greater than one second. To configure the system clock to synchronize to an authoritative DoD time source at least every 24 hours, edit the file "/etc/ntp.conf". Add or correct the following lines by replacing "[time_source]" with an authoritative DoD time source: server [time_source] maxpoll 16

a

The SUSE operating system must be configured to use Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).

AU-8 - Low - CCI-001890 - V-217282 - SV-217282r877383_rule

RMF Control

AU-8

Severity

L

CCI

CCI-001890

Version

SLES-12-030310

Vuln IDs

V-217282
V-77477

Rule IDs

SV-217282r877383_rule
SV-92173

If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis. Time stamps generated by the SUSE operating system include date and time. Time is commonly expressed in UTC, a modern continuation of GMT, or local time with an offset from UTC.

Checks: C-18510r646756_chk

Verify that the SUSE operating system is configured to use UTC or GMT. Check that the SUSE operating system is configured to use UTC or GMT with the following command: > timedatectl status | grep -i "time zone" Timezone: UTC (UTC, +0000) If "Time zone" is not set to "UTC" or "GMT", this is a finding.

Fix: F-18508r646757_fix

Configure the SUSE operating system is configured to use UTC or GMT. To configure the system time zone to use UTC or GMT, run the following command, replacing [ZONE] with "UTC" or "GMT". > sudo timedatectl set-timezone [ZONE]

b

The SUSE operating system must implement kptr-restrict to prevent the leaking of internal kernel addresses.

SI-16 - Medium - CCI-002824 - V-217283 - SV-217283r854161_rule

RMF Control

SI-16

Severity

M

CCI

CCI-002824

Version

SLES-12-030320

Vuln IDs

V-217283
V-77479

Rule IDs

SV-217283r854161_rule
SV-92175

Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced, with hardware providing the greater strength of mechanism. Examples of attacks are buffer overflow attacks.

Checks: C-18511r646759_chk

Verify the SUSE operating system prevents leaking of internal kernel addresses. Check that the SUSE operating system prevents leaking of internal kernel addresses by running the following command: > sudo sysctl kernel.kptr_restrict kernel.kptr_restrict = 1 If the kernel parameter "kptr_restrict" is not equal to "1" or nothing is returned, this is a finding.

Fix: F-18509r646760_fix

Configure the SUSE operating system to prevent leaking of internal kernel addresses by running the following command: > sudo sysctl -w kernel.kptr_restrict=1 If "1" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "kernel.kptr_restrict=1" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

Address space layout randomization (ASLR) must be implemented by the SUSE operating system to protect memory from unauthorized code execution.

SI-16 - Medium - CCI-002824 - V-217284 - SV-217284r854162_rule

RMF Control

SI-16

Severity

M

CCI

CCI-002824

Version

SLES-12-030330

Vuln IDs

V-217284
V-77481

Rule IDs

SV-217284r854162_rule
SV-92177

Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory include, for example, data execution prevention and address space layout randomization. Data execution prevention safeguards can either be hardware-enforced or software-enforced, with hardware providing the greater strength of mechanism. Examples of attacks are buffer overflow attacks.

Checks: C-18512r646762_chk

Verify the SUSE operating system implements ASLR. Check that the SUSE operating system implements ASLR by running the following command: > sudo sysctl kernel.randomize_va_space kernel.randomize_va_space = 2 If the kernel parameter "randomize_va_space" is not equal to "2" or nothing is returned, this is a finding.

Fix: F-18510r646763_fix

Configure the SUSE operating system to implement ASLR by running the following commands: > sudo sysctl -w kernel.randomize_va_space=2 If "2" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "kernel.randomize_va_space=2" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must off-load rsyslog messages for networked systems in real time and off-load standalone systems at least weekly.

AU-4 - Medium - CCI-001851 - V-217285 - SV-217285r854163_rule

RMF Control

AU-4

Severity

M

CCI

Version

SLES-12-030340

Vuln IDs

V-217285
V-77483

Rule IDs

SV-217285r854163_rule
SV-92179

Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.

Checks: C-18513r370011_chk

Verify that the SUSE operating system must off-load rsyslog messages for networked systems in real time and off-load standalone systems at least weekly. For stand-alone hosts, verify with the System Administrator that the log files are off-loaded at least weekly. For networked systems, check that rsyslog is sending log messages to a remote server with the following command: # sudo grep "\*.\*" /etc/rsyslog.conf | grep "@" | grep -v "^#" *.*;mail.none;news.none @192.168.1.101:514 If any active message labels in the file do not have a line to send log messages to a remote server, this is a finding.

Fix: F-18511r370012_fix

Configure the SUSE operating system to off-load rsyslog messages for networked systems in real time. For stand-alone systems establish a procedure to off-load log messages at least once a week. For networked systems add a "@[Log_Server_IP_Address]" option to every active message label in "/etc/rsyslog.conf" that does not have one. Some examples are listed below: *.*;mail.none;news.none -/var/log/messages *.*;mail.none;news.none @192.168.1.101:514 An additional option is to capture all of the log messages and send them to a remote log host: *.* @@loghost:514

b

The SUSE operating system must be configured to use TCP syncookies.

SC-5 - Medium - CCI-001095 - V-217286 - SV-217286r603262_rule

RMF Control

SC-5

Severity

M

CCI

CCI-001095

Version

SLES-12-030350

Vuln IDs

V-217286
V-77485

Rule IDs

SV-217286r603262_rule
SV-92181

Denial of Service (DoS) is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning.

Checks: C-18514r370014_chk

Verify the SUSE operating system is configured to use TCP syncookies. Check to see if syncookies are used with the following command: # sudo sysctl net.ipv4.tcp_syncookies net.ipv4.tcp_syncookies = 1 If the value is not set to "1", this is a finding.

Fix: F-18512r370015_fix

Configure the SUSE operating system to use TCP syncookies by running the following command as an administrator: # sudo sysctl -w net.ipv4.tcp_syncookies=1 If "1" is not the system's default value, add or update the following line in "/etc/sysctl.conf": net.ipv4.tcp_syncookies = 1

b

The SUSE operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets.

CM-6 - Medium - CCI-000366 - V-217287 - SV-217287r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030360

Vuln IDs

V-217287
V-77487

Rule IDs

SV-217287r603262_rule
SV-92183

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.

Checks: C-18515r370017_chk

Verify the SUSE operating system does not accept IPv4 source-routed packets. Check the value of the accept source route variable with the following command: # sysctl net.ipv4.conf.all.accept_source_route net.ipv4.conf.all.accept_source_route = 0 If the returned line does not have a value of "0" this is a finding.

Fix: F-18513r370018_fix

Configure the SUSE operating system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.all.accept_source_route = 0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not forward Internet Protocol version 6 (IPv6) source-routed packets.

CM-6 - Medium - CCI-000366 - V-217288 - SV-217288r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030361

Vuln IDs

V-217288
V-81803

Rule IDs

SV-217288r603262_rule
SV-96517

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.

Checks: C-18516r370020_chk

Verify the SUSE operating system does not accept IPv6 source-routed packets. Check the value of the accept source route variable with the following command: # sudo sysctl net.ipv6.conf.all.accept_source_route net.ipv6.conf.all.accept_source_route = 0 If the returned line does not have a value of "0", this is a finding.

Fix: F-18514r370021_fix

Configure the SUSE operating system to not accept IPv6 source-routed packets by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv6.conf.all.accept_source_route = 0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.

CM-6 - Medium - CCI-000366 - V-217289 - SV-217289r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030370

Vuln IDs

V-217289
V-77489

Rule IDs

SV-217289r603262_rule
SV-92185

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.

Checks: C-18517r370023_chk

Verify the SUSE operating system does not accept IPv4 source-routed packets by default. Check the value of the default accept source route variable with the following command: # sysctl net.ipv4.conf.default.accept_source_route net.ipv4.conf.default.accept_source_route = 0 If the returned line does not have a value of "0" this is a finding.

Fix: F-18515r370024_fix

Configure the SUSE operating system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.default.accept_source_route = 0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.

CM-6 - Medium - CCI-000366 - V-217290 - SV-217290r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030380

Vuln IDs

V-217290
V-77491

Rule IDs

SV-217290r603262_rule
SV-92187

Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.

Checks: C-18518r370026_chk

Verify the SUSE operating system does not accept IPv4 source-routed packets. Check the value of the accept source route variable with the following command: # sysctl net.ipv4.icmp_echo_ignore_broadcasts net.ipv4.icmp_echo_ignore_broadcasts = 1 If the returned line does not have a value of "1" this is a finding.

Fix: F-18516r370027_fix

Configure the SUSE operating system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.icmp_echo_ignore_broadcasts = 1 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

CM-6 - Medium - CCI-000366 - V-217291 - SV-217291r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030390

Vuln IDs

V-217291
V-77493

Rule IDs

SV-217291r603262_rule
SV-92189

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Checks: C-18519r370029_chk

Verify the SUSE operating system does not accept ICMP redirect messages. Check the value of the "net.ipv4.conf.all.accept_redirects" variable with the following command: # sysctl net.ipv4.conf.all.accept_redirects net.ipv4.conf.all.accept_redirects =0 If the returned line does not have a value of "0" this is a finding.

Fix: F-18517r370030_fix

Configure the SUSE operating system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.all.accept_redirects =0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not allow interfaces to accept Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.

CM-6 - Medium - CCI-000366 - V-217292 - SV-217292r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030400

Vuln IDs

V-217292
V-77495

Rule IDs

SV-217292r603262_rule
SV-92191

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Checks: C-18520r370032_chk

Verify the SUSE operating system ignores IPv4 ICMP redirect messages. Check the value of the "accept_redirects" variables with the following command: # sysctl net.ipv4.conf.default.accept_redirects net.ipv4.conf.default.accept_redirects = 0 If the returned line does not have a value of "0" this is a finding.

Fix: F-18518r370033_fix

Configure the SUSE operating system ignores IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.default.accept_redirects = 0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not allow interfaces to accept Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages by default.

CM-6 - Medium - CCI-000366 - V-217293 - SV-217293r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030401

Vuln IDs

V-217293
V-81805

Rule IDs

SV-217293r603262_rule
SV-96519

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Checks: C-18521r370035_chk

Verify the SUSE operating system does not allow IPv6 ICMP redirect messages by default. Check the value of the "default accept_redirects" variables with the following command: # sudo sysctl net.ipv6.conf.default.accept_redirects net.ipv6.conf.default.accept_redirects = 0 If the returned line does not have a value of "0", this is a finding.

Fix: F-18519r370036_fix

Configure the SUSE operating system to not allow IPv6 ICMP redirect messages by default. Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv6.conf.default.accept_redirects=0 Run the following command to apply this value: # sysctl –system

b

The SUSE operating system must not allow interfaces to send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.

CM-6 - Medium - CCI-000366 - V-217294 - SV-217294r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030410

Vuln IDs

V-217294
V-77497

Rule IDs

SV-217294r603262_rule
SV-92193

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.

Checks: C-18522r370038_chk

Verify the SUSE operating system does not allow interfaces to perform IPv4 ICMP redirects by default. Check the value of the "default send_redirects" variables with the following command: # sysctl net.ipv4.conf.default.send_redirects net.ipv4.conf.default.send_redirects = 0 If the returned line does not have a value of "0” this is a finding.

Fix: F-18520r370039_fix

Configure the SUSE operating system to not allow interfaces to perform IPv4 ICMP redirects by default. Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.default.send_redirects=0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.

CM-6 - Medium - CCI-000366 - V-217295 - SV-217295r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030420

Vuln IDs

V-217295
V-77499

Rule IDs

SV-217295r603262_rule
SV-92195

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.

Checks: C-18523r370041_chk

Verify the SUSE operating system does not send IPv4 ICMP redirect messages. Check the value of the "all send_redirects" variables with the following command: # sysctl net.ipv4.conf.all.send_redirects net.ipv4.conf.all.send_redirects =0 If the returned line does not have a value of "0” this is a finding.

Fix: F-18521r370042_fix

Configure the SUSE operating system to not allow interfaces to perform IPv4 ICMP redirects. Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.all.send_redirects=0 Run the following command to apply this value: # sysctl --system

b

The SUSE operating system must not be performing Internet Protocol version 4 (IPv4) packet forwarding unless the system is a router.

CM-6 - Medium - CCI-000366 - V-217296 - SV-217296r646767_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030430

Vuln IDs

V-217296
V-77501

Rule IDs

SV-217296r646767_rule
SV-92197

Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.

Checks: C-18524r646765_chk

Verify the SUSE operating system is not performing IPv4packet forwarding, unless the system is a router. Check to see if IPv4 forwarding is enabled using the following command: > sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 0 If the network parameter "ipv4.ip_forward" is not equal to "0" or nothing is returned, this is a finding.

Fix: F-18522r646766_fix

Configure the SUSE operating system to not performing IPv4 packet forwarding by running the following command as an administrator: > sudo sysctl -w net.ipv4.ip_forward=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv4.ip_forward=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must not have network interfaces in promiscuous mode unless approved and documented.

CM-6 - Medium - CCI-000366 - V-217297 - SV-217297r603262_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030440

Vuln IDs

V-217297
V-77503

Rule IDs

SV-217297r603262_rule
SV-92199

Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect information such as logon IDs, passwords, and key exchanges between systems. If the system is being used to perform a network troubleshooting function, the use of these tools must be documented with the Information System Security Officer (ISSO) and restricted to only authorized personnel.

Checks: C-18525r370047_chk

Verify the SUSE operating system network interfaces are not in promiscuous mode unless approved by the ISSO and documented. Check for the status with the following command: # ip link | grep -i promisc If network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.

Fix: F-18523r370048_fix

Configure the SUSE operating system network interfaces to turn off promiscuous mode unless approved by the ISSO and documented. Set the promiscuous mode of an interface to off with the following command: # ip link set dev <devicename> promisc off

b

The SUSE operating system wireless network adapters must be disabled unless approved and documented.

AC-18 - Medium - CCI-001443 - V-217298 - SV-217298r854164_rule

RMF Control

AC-18

Severity

M

CCI

CCI-001443

Version

SLES-12-030450

Vuln IDs

V-217298
V-77505

Rule IDs

SV-217298r854164_rule
SV-92201

Without protection of communications with wireless peripherals, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read, altered, or used to compromise the SUSE operating system. This requirement applies to wireless peripheral technologies (e.g., wireless mice, keyboards, displays, etc.) used with A SUSE operating system. Wireless peripherals (e.g., Wi-Fi/Bluetooth/IR Keyboards, Mice, and Pointing Devices and Near Field Communications [NFC]) present a unique challenge by creating an open, unsecured port on a computer. Wireless peripherals must meet DoD requirements for wireless data transmission and be approved for use by the AO. Even though some wireless peripherals, such as mice and pointing devices, do not ordinarily carry information that need to be protected, modification of communications with these wireless peripherals may be used to compromise the SUSE operating system. Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of communications with wireless peripherals can be accomplished by physical means (e.g., employing physical barriers to wireless radio frequencies) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa. If the wireless peripheral is only passing telemetry data, encryption of the data may not be required. Satisfies: SRG-OS-000299-GPOS-00117, SRG-OS-000300-GPOS-00118, SRG-OS-000481-GPOS-000481

Checks: C-18526r370050_chk

Verify that the SUSE operating system has no wireless network adapters enabled. Check that there are no wireless interfaces configured on the system with the following command: # wicked show all lo up link: #1, state up type: loopback config: compat:suse:/etc/sysconfig/network/ifcfg-lo leases: ipv4 static granted leases: ipv6 static granted addr: ipv4 127.0.0.1/8 [static] addr: ipv6 ::1/128 [static] eth0 up link: #2, state up, mtu 1500 type: ethernet, hwaddr 06:00:00:00:00:01 config: compat:suse:/etc/sysconfig/network/ifcfg-eth0 leases: ipv4 dhcp granted leases: ipv6 dhcp granted, ipv6 auto granted addr: ipv4 10.0.0.100/16 [dhcp] route: ipv4 default via 10.0.0.1 proto dhcp wlan0 up link: #3, state up, mtu 1500 type: wireless, hwaddr 06:00:00:00:00:02 config: wicked:xml:/etc/wicked/ifconfig/wlan0.xml leases: ipv4 dhcp granted addr: ipv4 10.0.0.101/16 [dhcp] route: ipv4 default via 10.0.0.1 proto dhcp If a wireless interface is configured it must be documented and approved by the local Authorizing Official. If a wireless interface is configured and has not been documented and approved, this is a finding.

Fix: F-18524r370051_fix

Configure the SUSE operating system to disable all wireless network interfaces with the following command: For each interface of type wireless, bring the interface into "down" state: # wicked ifdown wlan0 For each interface of type wireless with a configuration of type "compat:suse:", remove the associated file: # rm /etc/sysconfig/network/ifcfg-wlan0 For each interface of type wireless, for each configuration of type "wicked:xml:", remove the associated file or remove the interface configuration from the file. # rm /etc/wicked/ifconfig/wlan0.xml

b

The SUSE operating system must have the packages required for multifactor authentication to be installed.

IA-2 - Medium - CCI-001948 - V-217299 - SV-217299r854165_rule

RMF Control

IA-2

Severity

M

CCI

CCI-001948

Version

SLES-12-030500

Vuln IDs

V-217299
V-77507

Rule IDs

SV-217299r854165_rule
SV-92203

Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000376-GPOS-00161, SRG-OS-000377-GPOS-00162

Checks: C-18527r370053_chk

Fix: F-18525r370054_fix

Configure the SUSE operating system to implement multifactor authentication by installing the required packages. Install the packages required to support multifactor authentication with the following commands: #zypper install pam_pkcs11 #zypper install mozilla-nss #zypper install mozilla-nss-tools #zypper install pcsc-ccid #zypper install pcsc-lite #zypper install pcsc-tools #zypper install opensc #zypper install coolkey Additional information on the configuration of multifactor authentication on the SUSE operating system can be found at https://www.suse.com/communities/blog/configuring-smart-card-authentication-suse-linux-enterprise/

b

The SUSE operating system must implement certificate status checking for multifactor authentication.

IA-2 - Medium - CCI-001954 - V-217300 - SV-217300r854166_rule

RMF Control

IA-2

Severity

M

CCI

CCI-001954

Version

SLES-12-030510

Vuln IDs

V-217300
V-77509

Rule IDs

SV-217300r854166_rule
SV-92205

Using an authentication device, such as a Common Access Card (CAC) or token separate from the information system, ensures credentials stored on the authentication device will not be affected if the information system is compromised. Multifactor solutions that require devices separate from information systems to gain access include: hardware tokens providing time-based or challenge-response authenticators, and smart cards such as the U.S. Government Personal Identity Verification (PIV) card and the DoD CAC. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components with device-specific functions, or for organizational users (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000376-GPOS-00161, SRG-OS-000377-GPOS-00162

Checks: C-18528r370056_chk

Verify the SUSE operating system implements certificate status checking for multifactor authentication. Check that certificate status checking for multifactor authentication is implemented with the following command: # grep use_pkcs11_module /etc/pam_pkcs11/pam_pkcs11.conf | awk '/pkcs11_module coolkey {/,/}/' /etc/pam_pkcs11/pam_pkcs11.conf | grep cert_policy cert_policy = ca,ocsp_on,signature,crl_auto; If "cert_policy" is not set to include "ocsp_on", this is a finding.

Fix: F-18526r370057_fix

Configure the SUSE operating system to certificate status checking for PKI authentication. Modify all of the cert_policy lines in "/etc/pam_pkcs11/pam_pkcs11.conf" to include "ocsp_on". Note: OCSP allows sending request for certificate status information. Additional certificate validation polices are permitted. Additional information on the configuration of multifactor authentication on the SUSE operating system can be found at https://www.suse.com/communities/blog/configuring-smart-card-authentication-suse-linux-enterprise/

b

The SUSE operating system must implement multifactor authentication for access to privileged accounts via pluggable authentication modules (PAM).

IA-2 - Medium - CCI-000765 - V-217301 - SV-217301r854167_rule

RMF Control

IA-2

Severity

M

CCI

CCI-000765

Version

SLES-12-030520

Vuln IDs

V-217301
V-77511

Rule IDs

SV-217301r854167_rule
SV-92207

Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Satisfies: SRG-OS-000068-GPOS-00036, SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055, SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162

Checks: C-18529r370059_chk

Verify the SUSE operating system implements multifactor authentication for remote access to privileged accounts via pluggable authentication modules (PAM). Check that the "pam_pkcs11.so" option is configured in the "/etc/pam.d/common-auth" file with the following command: # grep pam_pkcs11.so /etc/pam.d/common-auth auth sufficient pam_pkcs11.so If "pam_pkcs11.so" is not set in "/etc/pam.d/common-auth", this is a finding.

Fix: F-18527r370060_fix

Configure the SUSE operating system to implement multifactor authentication for remote access to privileged accounts via PAM. Add or update "pam_pkcs11.so" in "/etc/pam.d/common-auth" to match the following line: auth sufficient pam_pkcs11.so

b

The SUSE operating system, for PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.

IA-5 - Medium - CCI-000185 - V-217302 - SV-217302r854168_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000185

Version

SLES-12-030530

Vuln IDs

V-217302
V-77513

Rule IDs

SV-217302r854168_rule
SV-92209

Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted. A trust anchor is an authoritative entity represented via a public key and associated data. It is used in the context of public key infrastructures, X.509 digital certificates, and DNSSEC. When there is a chain of trust, usually the top entity to be trusted becomes the trust anchor; it can be, for example, a Certification Authority (CA). A certification path starts with the subject certificate and proceeds through a number of intermediate certificates up to a trusted root certificate, typically issued by a trusted CA. This requirement verifies that a certification path to an accepted trust anchor is used for certificate validation and that the path includes status information. Path validation is necessary for a relying party to make an informed trust decision when presented with any certificate not already explicitly trusted. Status information for certification paths includes certificate revocation lists or online certificate status protocol responses. Validation of the certificate status information is out of scope for this requirement. Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000384-GPOS-00167

Checks: C-18530r646768_chk

Verify the SUSE operating system, for PKI-based authentication, had valid certificates by constructing a certification path (which includes status information) to an accepted trust anchor. Check that the certification path to an accepted trust anchor for multifactor authentication is implemented with the following command: > grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf cert_policy = ca,oscp_on,signature,crl_auto; If "cert_policy" is not set to include "ca", this is a finding.

Fix: F-18528r370063_fix

Configure the SUSE operating system, for PKI-based authentication, to validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor. Modify all of the cert_policy lines in "/etc/pam_pkcs11/pam_pkcs11.conf" to include "ca": cert_policy = ca,signature,oscp_on; Note: Additional certificate validation polices are permitted. Additional information on the configuration of multifactor authentication on the SUSE operating system can be found at https://www.suse.com/communities/blog/configuring-smart-card-authentication-suse-linux-enterprise/

b

The SUSE operating system must implement the Endpoint Security for Linux Threat Prevention tool.

SI-2 - Medium - CCI-001233 - V-222385 - SV-222385r754754_rule

RMF Control

SI-2

Severity

M

CCI

CCI-001233

Version

SLES-12-010599

Vuln IDs

V-222385
V-92249

Rule IDs

SV-222385r754754_rule
SV-102351

Adding endpoint security tools can provide the capability to automatically take actions in response to malicious behavior, which can provide additional agility in reacting to network threats. These tools also often include a reporting capability to provide network awareness of the system, which may not otherwise exist in an organization's systems management regime.

Checks: C-18385r754752_chk

Per OPORD 16-0080, the preferred endpoint security tool is McAfee Endpoint Security for Linux (ENSL) in conjunction with SELinux. Procedure: Check that the following package has been installed: # rpm -qa | grep -i mcafeetp If the "mcafeetp" package is not installed, this is a finding. Verify that the daemon is running: # ps -ef | grep -i mfetpd If the daemon is not running, this is a finding.

Fix: F-36322r754753_fix

Install and enable the latest McAfee ENSLTP package.

c

The SUSE operating system must use a virus scan program.

SI-3 - High - CCI-001668 - V-222386 - SV-222386r864046_rule

RMF Control

SI-3

Severity

H

CCI

CCI-001668

Version

SLES-12-030611

Vuln IDs

V-222386
V-102727

Rule IDs

SV-222386r864046_rule
SV-111689

Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems. The virus scanning software should be configured to perform scans dynamically on accessed files. If this capability is not available, the system must be configured to scan, at a minimum, all altered files on the system on a daily basis. If the system processes inbound SMTP mail, the virus scanner must be configured to scan all received mail.

Checks: C-19592r466210_chk

Verify an anti-virus solution is installed on the system. The anti-virus solution may be bundled with an approved host-based security solution. If there is no anti-virus solution installed on the system, this is a finding.

Fix: F-21313r466211_fix

Install an antivirus solution on the system.

b

The SUSE operating system SSH daemon must prevent remote hosts from connecting to the proxy display.

CM-6 - Medium - CCI-000366 - V-233308 - SV-233308r603331_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030261

Vuln IDs

V-233308

Rule IDs

SV-233308r603331_rule

When X11 forwarding is enabled, there may be additional exposure to the server and client displays if the sshd proxy display is configured to listen on the wildcard address. By default, sshd binds the forwarding server to the loopback address and sets the hostname part of the DIPSLAY environment variable to localhost. This prevents remote hosts from connecting to the proxy display.

Checks: C-36503r622236_chk

Verify the SUSE operating system SSH daemon prevents remote hosts from connecting to the proxy display. Check the SSH X11UseLocalhost setting with the following command: # sudo grep -i x11uselocalhost /etc/ssh/sshd_config X11UseLocalhost yes If the "X11UseLocalhost" keyword is set to "no", is missing, or is commented out, this is a finding.

Fix: F-36467r622237_fix

Configure the SUSE operating system SSH daemon to prevent remote hosts from connecting to the proxy display. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11UseLocalhost" keyword and set its value to "yes" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor): X11UseLocalhost yes

b

The SUSE operating system must restrict privilege elevation to authorized personnel.

CM-6 - Medium - CCI-000366 - V-237603 - SV-237603r646772_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010111

Vuln IDs

V-237603

Rule IDs

SV-237603r646772_rule

The sudo command allows a user to execute programs with elevated (administrator) privileges. It prompts the user for their password and confirms your request to execute a command by checking a file, called sudoers. If the "sudoers" file is not configured correctly, any user defined on the system can initiate privileged actions on the target system.

Checks: C-40822r646770_chk

Verify the "sudoers" file restricts sudo access to authorized personnel. $ sudo grep -iw 'ALL' /etc/sudoers /etc/sudoers.d/* If the either of the following entries are returned, this is a finding: ALL ALL=(ALL) ALL ALL ALL=(ALL:ALL) ALL

Fix: F-40785r646771_fix

Remove the following entries from the sudoers file: ALL ALL=(ALL) ALL ALL ALL=(ALL:ALL) ALL

b

The SUSE operating system must use the invoking user's password for privilege escalation when using "sudo".

AC-6 - Medium - CCI-002227 - V-237604 - SV-237604r861101_rule

RMF Control

AC-6

Severity

M

CCI

CCI-002227

Version

SLES-12-010112

Vuln IDs

V-237604

Rule IDs

SV-237604r861101_rule

The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. If the rootpw, targetpw, or runaspw flags are defined and not disabled, by default the operating system will prompt the invoking user for the "root" user password. For more information on each of the listed configurations, reference the sudoers(5) manual page.

Checks: C-40823r861100_chk

Verify that the sudoers security policy is configured to use the invoking user's password for privilege escalation. > sudo egrep -ir '(rootpw|targetpw|runaspw)' /etc/sudoers /etc/sudoers.d* | grep -v '#' /etc/sudoers:Defaults !targetpw /etc/sudoers:Defaults !rootpw /etc/sudoers:Defaults !runaspw If conflicting results are returned, this is a finding. If "Defaults !targetpw" is not defined, this is a finding. If "Defaults !rootpw" is not defined, this is a finding. If "Defaults !runaspw" is not defined, this is a finding.

Fix: F-40786r646774_fix

Define the following in the Defaults section of the /etc/sudoers file or a configuration file in the /etc/sudoers.d/ directory: Defaults !targetpw Defaults !rootpw Defaults !runaspw

b

The SUSE operating system must require re-authentication when using the "sudo" command.

IA-11 - Medium - CCI-002038 - V-237605 - SV-237605r861104_rule

RMF Control

IA-11

Severity

M

CCI

CCI-002038

Version

SLES-12-010113

Vuln IDs

V-237605

Rule IDs

SV-237605r861104_rule

Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the organization requires the user to re-authenticate when using the "sudo" command. If the value is set to an integer less than 0, the user's time stamp will not expire and the user will not have to re-authenticate for privileged actions until the user's session is terminated.

Checks: C-40824r861102_chk

Verify the operating system requires re-authentication when using the "sudo" command to elevate privileges. > sudo grep -ir 'timestamp_timeout' /etc/sudoers /etc/sudoers.d /etc/sudoers:Defaults timestamp_timeout=0 If conflicting results are returned, this is a finding. If "timestamp_timeout" is set to a negative number, is commented out, or no results are returned, this is a finding.

Fix: F-40787r861103_fix

Configure the "sudo" command to require re-authentication. Edit the /etc/sudoers file: > sudo visudo Add or modify the following line: Defaults timestamp_timeout=[value] Note: The "[value]" must be a number that is greater than or equal to "0".

b

The SUSE operating system must not have unnecessary account capabilities.

CM-6 - Medium - CCI-000366 - V-237606 - SV-237606r646781_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010631

Vuln IDs

V-237606

Rule IDs

SV-237606r646781_rule

Accounts providing no operational purpose provide additional opportunities for system compromise. Therefore all necessary non-interactive accounts should not have an interactive shell assigned to them.

Checks: C-40825r646779_chk

Verify all non-interactive SUSE operating system accounts do not have an interactive shell assigned to them. Obtain the list of authorized system accounts from the Information System Security Officer (ISSO). Check the system accounts on the system with the following command: > awk -F: '($7 !~ "/sbin/nologin" && $7 !~ "/bin/false"){print $1 ":" $3 ":" $7}' /etc/passwd root:0:/bin/bash nobody:65534:/bin/bash If a non-interactive accounts such as "games" or "nobody" is listed with an interactive shell, this is a finding.

Fix: F-40788r646780_fix

Configure the SUSE operating system so that all non-interactive accounts on the system have no interactive shell assigned to them. Run the following command to disable the interactive shell for a specific non-interactive user account: > sudo usermod --shell /sbin/nologin nobody

b

The SUSE operating system library files must have mode 0755 or less permissive.

CM-5 - Medium - CCI-001499 - V-237607 - SV-237607r646784_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010871

Vuln IDs

V-237607

Rule IDs

SV-237607r646784_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40826r646782_chk

Verify the system-wide shared library files contained in the directories "/lib", "/lib64", "/usr/lib" and "/usr/lib64" have mode 0755 or less permissive. Check that the system-wide shared library files have mode 0755 or less permissive with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 -perm /022 -type f -exec stat -c "%n %a" '{}' \; If any files are found to be group-writable or world-writable, this is a finding.

Fix: F-40789r646783_fix

Configure the library files to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 -perm /022 -type f -exec chmod 755 '{}' \;

b

The SUSE operating system library directories must have mode 0755 or less permissive.

CM-5 - Medium - CCI-001499 - V-237608 - SV-237608r646787_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010872

Vuln IDs

V-237608

Rule IDs

SV-237608r646787_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40827r646785_chk

Verify the system-wide shared library directories "/lib", "/lib64", "/usr/lib" and "/usr/lib64" have mode 0755 or less permissive. Check that the system-wide shared library directories have mode 0755 or less permissive with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 -perm /022 -type d -exec stat -c "%n %a" '{}' \; If any of the aforementioned directories are found to be group-writable or world-writable, this is a finding.

Fix: F-40790r646786_fix

Configure the shared library directories to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 -perm /022 -type d -exec chmod 755 '{}' \;

b

The SUSE operating system library files must be owned by root.

CM-5 - Medium - CCI-001499 - V-237609 - SV-237609r646790_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010873

Vuln IDs

V-237609

Rule IDs

SV-237609r646790_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40828r646788_chk

Verify the system-wide shared library files contained in the directories "/lib", "/lib64", "/usr/lib" and "/usr/lib64" are owned by root. Check that the system-wide shared library files are owned by root with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -user root -type f -exec stat -c "%n %U" '{}' \; If any system wide library file is returned, this is a finding.

Fix: F-40791r646789_fix

Configure the system library files to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -user root -type f -exec chown root '{}' \;

b

The SUSE operating system library directories must be owned by root.

CM-5 - Medium - CCI-001499 - V-237610 - SV-237610r646793_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010874

Vuln IDs

V-237610

Rule IDs

SV-237610r646793_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40829r646791_chk

Verify the system-wide shared library directories "/lib", "/lib64", "/usr/lib/" and "/usr/lib64" are owned by root. Check that the system-wide shared library directories are owned by root with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -user root -type d -exec stat -c "%n %U" '{}' \; If any system wide library directory is returned, this is a finding.

Fix: F-40792r646792_fix

Configure the library files and their respective parent directories to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -user root -type d -exec chown root '{}' \;

b

The SUSE operating system library files must be group-owned by root.

CM-5 - Medium - CCI-001499 - V-237611 - SV-237611r646796_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010875

Vuln IDs

V-237611

Rule IDs

SV-237611r646796_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40830r646794_chk

Verify the system-wide library files contained in the directories "/lib", "/lib64", "/usr/lib" and "/usr/lib64" are group-owned by root. Check that the system-wide library files are group-owned by root with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -group root -type f -exec stat -c "%n %G" '{}' \; If any system wide shared library file is returned, this is a finding.

Fix: F-40793r646795_fix

Configure the system library files to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -group root -type f -exec chgrp root '{}' \;

b

The SUSE operating system library directories must be group-owned by root.

CM-5 - Medium - CCI-001499 - V-237612 - SV-237612r646799_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010876

Vuln IDs

V-237612

Rule IDs

SV-237612r646799_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40831r646797_chk

Verify the system-wide library directories "/lib", "/lib64", "/usr/lib" and "/usr/lib64" are group-owned by root. Check that the system-wide library directories are group-owned by root with the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -group root -type d -exec stat -c "%n %G" '{}' \; If any system wide shared library directory is returned, this is a finding.

Fix: F-40794r646798_fix

Configure the system library directories to be protected from unauthorized access. Run the following command: > sudo find /lib /lib64 /usr/lib /usr/lib64 ! -group root -type d -exec chgrp root '{}' \;

b

The SUSE operating system must have system commands set to a mode of 755 or less permissive.

CM-5 - Medium - CCI-001499 - V-237613 - SV-237613r917814_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010877

Vuln IDs

V-237613

Rule IDs

SV-237613r917814_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40832r917813_chk

Verify the system commands contained in the following directories have mode 755 or less permissive: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Check that the system command files have mode 755 or less permissive with the following command: > find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin -perm /022 -type f -exec stat -c "%n %a" '{}' \; If any files are found to be group-writable or world-writable, this is a finding.

Fix: F-40795r646801_fix

Configure the system commands to be protected from unauthorized access. Run the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin -perm /022 -type f -exec chmod 755 '{}' \;

b

The SUSE operating system must have directories that contain system commands set to a mode of 0755 or less permissive.

CM-5 - Medium - CCI-001499 - V-237614 - SV-237614r646805_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010878

Vuln IDs

V-237614

Rule IDs

SV-237614r646805_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40833r646803_chk

Verify the system commands directories have mode 0755 or less permissive: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Check that the system command directories have mode 0755 or less permissive with the following command: > find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin -perm /022 -type d -exec stat -c "%n %a" '{}' \; If any directories are found to be group-writable or world-writable, this is a finding.

Fix: F-40796r646804_fix

Configure the system commands directories to be protected from unauthorized access. Run the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin -perm /022 -type d -exec chmod -R 755 '{}' \;

b

The SUSE operating system must have system commands owned by root.

CM-5 - Medium - CCI-001499 - V-237615 - SV-237615r646808_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010879

Vuln IDs

V-237615

Rule IDs

SV-237615r646808_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40834r646806_chk

Verify the system commands contained in the following directories are owned by root: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Use the following command for the check: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -user root -type f -exec stat -c "%n %U" '{}' \; If any system commands are returned, this is a finding.

Fix: F-40797r646807_fix

Configure the system commands - and their respective parent directories - to be protected from unauthorized access. Run the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -user root -type f -exec chown root '{}' \;

b

The SUSE operating system must have directories that contain system commands owned by root.

CM-5 - Medium - CCI-001499 - V-237616 - SV-237616r646811_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010881

Vuln IDs

V-237616

Rule IDs

SV-237616r646811_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40835r646809_chk

Verify the system commands directories are owned by root: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Use the following command for the check: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -user root -type d -exec stat -c "%n %U" '{}' \; If any system commands directories are returned, this is a finding.

Fix: F-40798r646810_fix

Configure the system commands directories to be protected from unauthorized access. Run the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -user root -type d -exec chown root '{}' \;

b

The SUSE operating system must have system commands group-owned by root or a system account.

CM-5 - Medium - CCI-001499 - V-237617 - SV-237617r832997_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010882

Vuln IDs

V-237617

Rule IDs

SV-237617r832997_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40836r832995_chk

Verify the system commands contained in the following directories are group-owned by root or a system account: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Run the check with the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root -type f -exec stat -c "%n %G" '{}' \; If any system commands are returned that are not Set Group ID upon execution (SGID) files and group-owned by a required system account, this is a finding.

Fix: F-40799r832996_fix

Configure the system commands to be protected from unauthorized access. Run the following command, replacing "[FILE]" with any system command file not group-owned by "root" or a required system account. > sudo chgrp root [FILE]

b

The SUSE operating system must have directories that contain system commands group-owned by root.

CM-5 - Medium - CCI-001499 - V-237618 - SV-237618r646817_rule

RMF Control

CM-5

Severity

M

CCI

Version

SLES-12-010883

Vuln IDs

V-237618

Rule IDs

SV-237618r646817_rule

If the SUSE operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to SUSE operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Checks: C-40837r646815_chk

Verify the system commands directories are group-owned by root: /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin Run the check with the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root -type d -exec stat -c "%n %G" '{}' \; If any system commands directories are returned that are not Set Group ID up on execution (SGID) files and owned by a privileged account, this is a finding.

Fix: F-40800r646816_fix

Configure the system commands directories to be protected from unauthorized access. Run the following command: > sudo find -L /bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin ! -group root -type d -exec chgrp root '{}' \;

b

The SUSE operating system must not have the vsftpd package installed if not required for operational support.

IA-5 - Medium - CCI-000197 - V-237619 - SV-237619r877396_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000197

Version

SLES-12-030011

Vuln IDs

V-237619

Rule IDs

SV-237619r877396_rule

It is detrimental for SUSE operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked, and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. SUSE operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions and functions). Examples of nonessential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but which cannot be disabled.

Checks: C-40838r646818_chk

Verify the vsftpd package is not installed on the SUSE operating system. Check that the vsftpd package is not installed on the SUSE operating system by running the following command: > zypper info vsftpd | grep Installed If "vsftpd" is installed and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix: F-40801r646819_fix

Document the "vsftpd" package with the ISSO as an operational requirement or remove it from the system with the following command: > sudo zypper remove vsftpd

b

The SUSE operating system must not forward Internet Protocol version 6 (IPv6) source-routed packets by default.

CM-6 - Medium - CCI-000366 - V-237620 - SV-237620r646823_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030362

Vuln IDs

V-237620

Rule IDs

SV-237620r646823_rule

Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.

Checks: C-40839r646821_chk

Verify the SUSE operating system does not accept IPv6 source-routed packets by default. Check the value of the default IPv6 accept source route variable with the following command: > sudo sysctl net.ipv6.conf.default.accept_source_route net.ipv6.conf.default.accept_source_route = 0 If the network parameter "ipv6.conf.default.accept_source_route" is not equal to "0" or nothing is returned, this is a finding.

Fix: F-40802r646822_fix

Configure the SUSE operating system to disable IPv6 default source routing by running the following command as an administrator: > sudo sysctl -w net.ipv6.conf.default.accept_source_route=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv6.conf.default.accept_source_route=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must prevent Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

CM-6 - Medium - CCI-000366 - V-237621 - SV-237621r646826_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030363

Vuln IDs

V-237621

Rule IDs

SV-237621r646826_rule

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Checks: C-40840r646824_chk

Verify the SUSE operating system does not accept IPv6 source-routed packets by default. Verify the SUSE operating system does not accept IPv6 ICMP redirect messages. Check the value of the IPv6 accept_redirects variable with the following command: > sudo sysctl net.ipv6.conf.all.accept_redirects net.ipv6.conf.all.accept_redirects =0 If the network parameter "ipv6.conf.all.accept_redirects" is not equal to "0" or nothing is returned, this is a finding.

Fix: F-40803r646825_fix

Configure the SUSE operating system to not accept IPv6 ICMP redirect messages by running the following command as an administrator: > sudo sysctl -w net.ipv6.conf.all.accept_redirects=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv6.conf.all.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must not be performing Internet Protocol version 6 (IPv6) packet forwarding unless the system is a router.

CM-6 - Medium - CCI-000366 - V-237622 - SV-237622r646829_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030364

Vuln IDs

V-237622

Rule IDs

SV-237622r646829_rule

Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.

Checks: C-40841r646827_chk

Verify the SUSE operating system is not performing IPv6 packet forwarding, unless the system is a router. Check to see if IPv6 forwarding is enabled using the following command: > sudo sysctl net.ipv6.conf.all.forwarding net.ipv6.conf.all.forwarding = 0 If the network parameter "ipv6.conf.all.forwarding" is not equal to "0" or nothing is returned, this is a finding.

Fix: F-40804r646828_fix

Configure the SUSE operating system to not performing IPv6 packet forwarding by running the following command as an administrator: > sudo sysctl -w net.ipv6.conf.all.forwarding=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv6.conf.all.forwarding=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must not be performing Internet Protocol version 6 (IPv6) packet forwarding by default unless the system is a router.

CM-6 - Medium - CCI-000366 - V-237623 - SV-237623r646832_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-030365

Vuln IDs

V-237623

Rule IDs

SV-237623r646832_rule

Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.

Checks: C-40842r646830_chk

Verify the SUSE operating system is not performing IPv6 packet forwarding by default, unless the system is a router. Check to see if IPv6 forwarding is disabled by default using the following command: > sudo sysctl net.ipv6.conf.default.forwarding net.ipv6.conf.default.forwarding = 0 If the network parameter "ipv6.conf.default.forwarding" is not equal to "0" or nothing is returned, this is a finding.

Fix: F-40805r646831_fix

Configure the SUSE operating system to not performing IPv6 packet forwarding by default by running the following command as an administrator: > sudo sysctl -w net.ipv6.conf.default.forwarding=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv6.conf.default.forwarding=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system

b

The SUSE operating system must specify the default "include" directory for the /etc/sudoers file.

CM-6 - Medium - CCI-000366 - V-251719 - SV-251719r832989_rule

RMF Control

CM-6

Severity

M

CCI

Version

SLES-12-010109

Vuln IDs

V-251719

Rule IDs

SV-251719r832989_rule

The "sudo" command allows authorized users to run programs (including shells) as other users, system users, and root. The "/etc/sudoers" file is used to configure authorized "sudo" users as well as the programs they are allowed to run. Some configuration options in the "/etc/sudoers" file allow configured users to run programs without re-authenticating. Use of these configuration options makes it easier for one compromised account to be used to compromise other accounts. It is possible to include other sudoers files from within the sudoers file currently being parsed using the #include and #includedir directives. When sudo reaches this line it will suspend processing of the current file (/etc/sudoers) and switch to the specified file/directory. Once the end of the included file(s) are reached, the rest of /etc/sudoers will be processed. Files that are included may themselves include other files. A hard limit of 128 nested include files is enforced to prevent include file loops.

Checks: C-55156r832987_chk

Note: If the "include" and "includedir" directives are not present in the /etc/sudoers file, this requirement is not applicable. Verify the operating system specifies only the default "include" directory for the /etc/sudoers file with the following command: > sudo grep include /etc/sudoers #includedir /etc/sudoers.d If the results are not "/etc/sudoers.d" or additional files or directories are specified, this is a finding. Verify the operating system does not have nested "include" files or directories within the /etc/sudoers.d directory with the following command: > sudo grep -r include /etc/sudoers.d If results are returned, this is a finding.

Fix: F-55110r832988_fix

Configure the /etc/sudoers file to only include the /etc/sudoers.d directory. Edit the /etc/sudoers file with the following command: > sudo visudo Add or modify the following line: #includedir /etc/sudoers.d

b

The SUSE operating system must not be configured to bypass password requirements for privilege escalation.

IA-11 - Medium - CCI-002038 - V-251720 - SV-251720r854176_rule

RMF Control

IA-11

Severity

M

CCI

CCI-002038

Version

SLES-12-010114

Vuln IDs

V-251720

Rule IDs

SV-251720r854176_rule

Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158

Checks: C-55157r854174_chk

Verify the operating system is not configured to bypass password requirements for privilege escalation. Check the configuration of the "/etc/pam.d/sudo" file with the following command: $ sudo grep pam_succeed_if /etc/pam.d/sudo If any occurrences of "pam_succeed_if" are returned from the command, this is a finding.

Fix: F-55111r854175_fix

Configure the operating system to require users to supply a password for privilege escalation. Check the configuration of the "/etc/ pam.d/sudo" file with the following command: $ sudo vi /etc/pam.d/sudo Remove any occurrences of "pam_succeed_if" in the file.

c

The SUSE operating system must not have accounts configured with blank or null passwords.

CM-6 - High - CCI-000366 - V-251721 - SV-251721r809453_rule

RMF Control

CM-6

Severity

H

CCI

Version

SLES-12-010221

Vuln IDs

V-251721

Rule IDs

SV-251721r809453_rule

If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.

Checks: C-55158r809451_chk

Check the "/etc/shadow" file for blank passwords with the following command: $ sudo awk -F: '!$2 {print $1}' /etc/shadow If the command returns any results, this is a finding.

Fix: F-55112r809452_fix

Configure all accounts on the system to have a password or lock the account with the following commands: Perform a password reset: $ sudo passwd [username] Lock an account: $ sudo passwd -l [username]

b

The SUSE operating system must generate audit records for all uses of the unlink, unlinkat, rename, renameat and rmdir syscalls.

AU-3 - Medium - CCI-000130 - V-251722 - SV-251722r854178_rule

RMF Control

AU-3

Severity

M

CCI