Red Hat Enterprise Linux 7 Security Technical Implementation Guide
- Version/Release: V3R15
- Published: 2024-05-30
- Released: 2024-07-24
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- RMF Control
- AU-9
- Severity
- High
- CCI
- CCI-001494
- Version
- RHEL-07-010010
- Vuln IDs
-
- V-204392
- V-71849
- Rule IDs
-
- SV-204392r991558_rule
- SV-86473
Checks: C-36339r880750_chk
Verify the file permissions, ownership, and group membership of system files and commands match the vendor values. Check the default file permissions, ownership, and group membership of system files and commands with the following command: # for i in `rpm -Va | grep -E '^.{1}M|^.{5}U|^.{6}G' | cut -d " " -f 4,5`;do for j in `rpm -qf $i`;do rpm -ql $j --dump | cut -d " " -f 1,5,6,7 | grep $i;done;done /var/log/gdm 040755 root root /etc/audisp/audisp-remote.conf 0100640 root root /usr/bin/passwd 0104755 root root For each file returned, verify the current permissions, ownership, and group membership: # ls -la <filename> -rw-------. 1 root root 2017 Nov 1 10:03 /etc/audisp/audisp-remote.conf If the file is more permissive than the default permissions, this is a finding. If the file is not owned by the default owner and is not documented with the Information System Security Officer (ISSO), this is a finding. If the file is not a member of the default group and is not documented with the Information System Security Officer (ISSO), this is a finding.
Fix: F-36302r880751_fix
Run the following command to determine which package owns the file: # rpm -qf <filename> Reset the user and group ownership of files within a package with the following command: # rpm --setugids <packagename> Reset the permissions of files within a package with the following command: # rpm --setperms <packagename>
- RMF Control
- AC-8
- Severity
- Medium
- CCI
- CCI-000048
- Version
- RHEL-07-010030
- Vuln IDs
-
- V-204393
- V-71859
- Rule IDs
-
- SV-204393r958390_rule
- SV-86483
Checks: C-4517r88371_chk
Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a graphical user logon. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if the operating system displays a banner at the logon screen with the following command: # grep banner-message-enable /etc/dconf/db/local.d/* banner-message-enable=true If "banner-message-enable" is set to "false" or is missing, this is a finding.
Fix: F-4517r88372_fix
Configure the operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Create a database to contain the system-wide graphical user logon settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/01-banner-message Add the following line to the [org/gnome/login-screen] section of the "/etc/dconf/db/local.d/01-banner-message": [org/gnome/login-screen] banner-message-enable=true Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.
- RMF Control
- AC-8
- Severity
- Medium
- CCI
- CCI-000048
- Version
- RHEL-07-010040
- Vuln IDs
-
- V-204394
- V-71861
- Rule IDs
-
- SV-204394r958390_rule
- SV-86485
Checks: C-4518r297478_chk
Verify the operating system displays the approved Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a graphical user logon. Note: If the system does not have a Graphical User Interface installed, this requirement is Not Applicable. Check that the operating system displays the exact approved Standard Mandatory DoD Notice and Consent Banner text with the command: # grep banner-message-text /etc/dconf/db/local.d/* banner-message-text= 'You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n-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.\n-At any time, the USG may inspect and seize data stored on this IS.\n-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.\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n-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. ' Note: The "\n " characters are for formatting only. They will not be displayed on the Graphical User Interface. If the banner does not match the approved Standard Mandatory DoD Notice and Consent Banner, this is a finding.
Fix: F-4518r297479_fix
Configure the operating system to display the approved Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Note: If the system does not have a Graphical User Interface installed, this requirement is Not Applicable. Create a database to contain the system-wide graphical user logon settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/01-banner-message Add the following line to the [org/gnome/login-screen] section of the "/etc/dconf/db/local.d/01-banner-message": [org/gnome/login-screen] banner-message-enable=true banner-message-text='You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n-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.\n-At any time, the USG may inspect and seize data stored on this IS.\n-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.\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n-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. ' Note: The "\n " characters are for formatting only. They will not be displayed on the Graphical User Interface. Run the following command to update the database: # dconf update
- RMF Control
- AC-8
- Severity
- Medium
- CCI
- CCI-000048
- Version
- RHEL-07-010050
- Vuln IDs
-
- V-204395
- V-71863
- Rule IDs
-
- SV-204395r958390_rule
- SV-86487
Checks: C-4519r88377_chk
Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system via a command line user logon. Check to see if the operating system displays a banner at the command line logon screen with the following command: # more /etc/issue The command should return the following 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 operating system does not display a graphical logon banner or the banner does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding. If the text in the "/etc/issue" file does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding.
Fix: F-4519r88378_fix
Configure the operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system via the command line by editing the "/etc/issue" file. Replace the default text with the Standard Mandatory DoD Notice and Consent Banner. The DoD required text is: "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."
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000056
- Version
- RHEL-07-010060
- Vuln IDs
-
- V-204396
- V-71891
- Rule IDs
-
- SV-204396r958400_rule
- SV-86515
Checks: C-4520r880744_chk
Verify the operating system enables a user's session lock until that user re-establishes access using established identification and authentication procedures. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if the screen lock is enabled with the following command: # grep -ir lock-enabled /etc/dconf/db/local.d/ | grep -v locks lock-enabled=true If the "lock-enabled" setting is missing or is not set to "true", this is a finding.
Fix: F-4520r880745_fix
Configure the operating system to enable a user's session lock until that user re-establishes access using established identification and authentication procedures. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following example: # touch /etc/dconf/db/local.d/00-screensaver Edit the "[org/gnome/desktop/screensaver]" section of the database file and add or update the following lines: # Set this to true to lock the screen when the screensaver activates lock-enabled=true Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.
- RMF Control
- IA-2
- Severity
- Medium
- CCI
- CCI-001948
- Version
- RHEL-07-010061
- Vuln IDs
-
- V-204397
- V-77819
- Rule IDs
-
- SV-204397r982216_rule
- SV-92515
Checks: C-4521r88383_chk
Verify the operating system uniquely identifies and authenticates users using multifactor authentication via a graphical user logon. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Note: The example is using the database local for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than local is being used. # grep enable-smartcard-authentication /etc/dconf/db/local.d/* enable-smartcard-authentication=true If "enable-smartcard-authentication" is set to "false" or the keyword is missing, this is a finding.
Fix: F-4521r88384_fix
Configure the operating system to uniquely identify and authenticate users using multifactor authentication via a graphical user logon. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example is using the database local for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. # touch /etc/dconf/db/local.d/00-defaults Edit "[org/gnome/login-screen]" and add or update the following line: enable-smartcard-authentication=true Update the system databases: # dconf update
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010070
- Vuln IDs
-
- V-204398
- V-71893
- Rule IDs
-
- SV-204398r958402_rule
- SV-86517
Checks: C-4522r880768_chk
Verify the operating system initiates a screensaver after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check to see if GNOME is configured to display a screensaver after a 15 minute delay with the following command: # grep -i idle-delay /etc/dconf/db/local.d/* idle-delay=uint32 900 If the "idle-delay" setting is missing or is not set to "900" or less, this is a finding.
Fix: F-4522r880769_fix
Configure the operating system to initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/00-screensaver Edit /etc/dconf/db/local.d/00-screensaver and add or update the following lines: [org/gnome/desktop/session] # Set the lock time out to 900 seconds before the session is considered idle idle-delay=uint32 900 You must include the "uint32" along with the integer key values as shown. Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010081
- Vuln IDs
-
- V-204399
- V-73155
- Rule IDs
-
- SV-204399r958402_rule
- SV-87807
Checks: C-4523r880771_chk
Verify the operating system prevents a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the lock delay setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i lock-delay /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/lock-delay If the command does not return a result, this is a finding.
Fix: F-4523r880772_fix
Configure the operating system to prevent a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. # touch /etc/dconf/db/local.d/locks/session Add the setting to lock the screensaver lock delay: /org/gnome/desktop/screensaver/lock-delay
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010082
- Vuln IDs
-
- V-204400
- V-73157
- Rule IDs
-
- SV-204400r958402_rule
- SV-87809
Checks: C-4524r880774_chk
Verify the operating system prevents a user from overriding session idle delay after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the session idle delay setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i idle-delay /etc/dconf/db/local.d/locks/* /org/gnome/desktop/session/idle-delay If the command does not return a result, this is a finding.
Fix: F-4524r880775_fix
Configure the operating system to prevent a user from overriding a session lock after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example below is using the database "local" for the system, so if the system is using another database in /etc/dconf/profile/user, the file should be created under the appropriate subdirectory. # touch /etc/dconf/db/local.d/locks/session Add the setting to lock the session idle delay: /org/gnome/desktop/session/idle-delay
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010100
- Vuln IDs
-
- V-204402
- V-71899
- Rule IDs
-
- SV-204402r958402_rule
- SV-86523
Checks: C-4526r880780_chk
Verify the operating system initiates a session lock after a 15-minute period of inactivity for graphical user interfaces. Note: If the system does not have a GNOME installed, this requirement is Not Applicable. Check for the session lock settings with the following commands: # grep -i idle-activation-enabled /etc/dconf/db/local.d/* idle-activation-enabled=true If "idle-activation-enabled" is not set to "true", this is a finding.
Fix: F-4526r880781_fix
Configure the operating system to initiate a session lock after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/00-screensaver Add the setting to enable screensaver locking after 15 minutes of inactivity: [org/gnome/desktop/screensaver] idle-activation-enabled=true Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010101
- Vuln IDs
-
- V-204403
- V-78997
- Rule IDs
-
- SV-204403r958402_rule
- SV-93703
Checks: C-4527r880783_chk
Verify the operating system prevents a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the idle-activation-enabled setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i idle-activation-enabled /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/idle-activation-enabled If the command does not return a result, this is a finding.
Fix: F-4527r880784_fix
Configure the operating system to prevent a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. # touch /etc/dconf/db/local.d/locks/session Add the setting to lock the screensaver idle-activation-enabled setting: /org/gnome/desktop/screensaver/idle-activation-enabled
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010110
- Vuln IDs
-
- V-204404
- V-71901
- Rule IDs
-
- SV-204404r958402_rule
- SV-86525
Checks: C-4528r880786_chk
Verify the operating system initiates a session lock a for graphical user interfaces when the screensaver is activated. Note: If the system does not have GNOME installed, this requirement is Not Applicable. If GNOME is installed, check to see a session lock occurs when the screensaver is activated with the following command: # grep -i lock-delay /etc/dconf/db/local.d/* lock-delay=uint32 5 If the "lock-delay" setting is missing, or is not set to "5" or less, this is a finding.
Fix: F-4528r880787_fix
Configure the operating system to initiate a session lock for graphical user interfaces when a screensaver is activated. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: # touch /etc/dconf/db/local.d/00-screensaver Add the setting to enable session locking when a screensaver is activated: [org/gnome/desktop/screensaver] lock-delay=uint32 5 The "uint32" must be included along with the integer key values as shown. Update the system databases: # dconf update Users must log out and back in again before the system-wide settings take effect.
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000192
- Version
- RHEL-07-010118
- Vuln IDs
-
- V-204405
- V-81003
- Rule IDs
-
- SV-204405r982195_rule
- SV-95715
Checks: C-4529r88407_chk
Verify that /etc/pam.d/passwd is configured to use /etc/pam.d/system-auth when changing passwords: # cat /etc/pam.d/passwd | grep -i substack | grep -i system-auth password substack system-auth If no results are returned, the line is commented out, this is a finding.
Fix: F-4529r88408_fix
Configure PAM to utilize /etc/pam.d/system-auth when changing passwords. Add the following line to "/etc/pam.d/passwd" (or modify the line to have the required value): password substack system-auth
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000192
- Version
- RHEL-07-010119
- Vuln IDs
-
- V-204406
- V-73159
- Rule IDs
-
- SV-204406r982195_rule
- SV-87811
Checks: C-4530r902702_chk
Verify the operating system uses "pwquality" to enforce the password complexity rules. Check for the use of "pwquality" with the following command: # cat /etc/pam.d/system-auth | grep pam_pwquality password requisite pam_pwquality.so retry=3 If the command does not return an uncommented line containing the value "pam_pwquality.so" as shown, this is a finding. If the value of "retry" is set to "0" or greater than "3", this is a finding.
Fix: F-4530r902703_fix
Configure the operating system to use "pwquality" to enforce password complexity rules. Add the following line to "/etc/pam.d/system-auth" (or modify the line to have the required value): password requisite pam_pwquality.so retry=3 Note: The value of "retry" should be between "1" and "3".
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000192
- Version
- RHEL-07-010120
- Vuln IDs
-
- V-204407
- V-71903
- Rule IDs
-
- SV-204407r982195_rule
- SV-86527
Checks: C-4531r88413_chk
Note: The value to require a number of upper-case characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "ucredit" in "/etc/security/pwquality.conf" with the following command: # grep ucredit /etc/security/pwquality.conf ucredit = -1 If the value of "ucredit" is not set to a negative value, this is a finding.
Fix: F-4531r88414_fix
Configure the operating system to enforce password complexity by requiring that at least one upper-case character be used by setting the "ucredit" option. Add the following line to "/etc/security/pwquality.conf" (or modify the line to have the required value): ucredit = -1
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000193
- Version
- RHEL-07-010130
- Vuln IDs
-
- V-204408
- V-71905
- Rule IDs
-
- SV-204408r982196_rule
- SV-86529
Checks: C-4532r88416_chk
Note: The value to require a number of lower-case characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "lcredit" in "/etc/security/pwquality.conf" with the following command: # grep lcredit /etc/security/pwquality.conf lcredit = -1 If the value of "lcredit" is not set to a negative value, this is a finding.
Fix: F-4532r88417_fix
Configure the system to require at least one lower-case character when creating or changing a password. Add or modify the following line in "/etc/security/pwquality.conf": lcredit = -1
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000194
- Version
- RHEL-07-010140
- Vuln IDs
-
- V-204409
- V-71907
- Rule IDs
-
- SV-204409r982197_rule
- SV-86531
Checks: C-4533r88419_chk
Note: The value to require a number of numeric characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "dcredit" in "/etc/security/pwquality.conf" with the following command: # grep dcredit /etc/security/pwquality.conf dcredit = -1 If the value of "dcredit" is not set to a negative value, this is a finding.
Fix: F-4533r88420_fix
Configure the operating system to enforce password complexity by requiring that at least one numeric character be used by setting the "dcredit" option. Add the following line to /etc/security/pwquality.conf (or modify the line to have the required value): dcredit = -1
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-001619
- Version
- RHEL-07-010150
- Vuln IDs
-
- V-204410
- V-71909
- Rule IDs
-
- SV-204410r991561_rule
- SV-86533
Checks: C-4534r88422_chk
Verify the operating system enforces password complexity by requiring that at least one special character be used. Note: The value to require a number of special characters to be set is expressed as a negative number in "/etc/security/pwquality.conf". Check the value for "ocredit" in "/etc/security/pwquality.conf" with the following command: # grep ocredit /etc/security/pwquality.conf ocredit=-1 If the value of "ocredit" is not set to a negative value, this is a finding.
Fix: F-4534r88423_fix
Configure the operating system to enforce password complexity by requiring that at least one special character be used by setting the "ocredit" option. Add the following line to "/etc/security/pwquality.conf" (or modify the line to have the required value): ocredit = -1
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000195
- Version
- RHEL-07-010160
- Vuln IDs
-
- V-204411
- V-71911
- Rule IDs
-
- SV-204411r982198_rule
- SV-86535
Checks: C-4535r88425_chk
The "difok" option sets the number of characters in a password that must not be present in the old password. Check for the value of the "difok" option in "/etc/security/pwquality.conf" with the following command: # grep difok /etc/security/pwquality.conf difok = 8 If the value of "difok" is set to less than "8", this is a finding.
Fix: F-4535r88426_fix
Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed by setting the "difok" option. Add the following line to "/etc/security/pwquality.conf" (or modify the line to have the required value): difok = 8
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000195
- Version
- RHEL-07-010170
- Vuln IDs
-
- V-204412
- V-71913
- Rule IDs
-
- SV-204412r982198_rule
- SV-86537
Checks: C-4536r88428_chk
The "minclass" option sets the minimum number of required classes of characters for the new password (digits, upper-case, lower-case, others). Check for the value of the "minclass" option in "/etc/security/pwquality.conf" with the following command: # grep minclass /etc/security/pwquality.conf minclass = 4 If the value of "minclass" is set to less than "4", this is a finding.
Fix: F-4536r88429_fix
Configure the operating system to require the change of at least four character classes when passwords are changed by setting the "minclass" option. Add the following line to "/etc/security/pwquality.conf conf" (or modify the line to have the required value): minclass = 4
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000195
- Version
- RHEL-07-010180
- Vuln IDs
-
- V-204413
- V-71915
- Rule IDs
-
- SV-204413r982198_rule
- SV-86539
Checks: C-4537r88431_chk
The "maxrepeat" option sets the maximum number of allowed same consecutive characters in a new password. Check for the value of the "maxrepeat" option in "/etc/security/pwquality.conf" with the following command: # grep maxrepeat /etc/security/pwquality.conf maxrepeat = 3 If the value of "maxrepeat" is set to more than "3", this is a finding.
Fix: F-4537r88432_fix
Configure the operating system to require the change of the number of repeating consecutive characters when passwords are changed by setting the "maxrepeat" option. Add the following line to "/etc/security/pwquality.conf conf" (or modify the line to have the required value): maxrepeat = 3
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000195
- Version
- RHEL-07-010190
- Vuln IDs
-
- V-204414
- V-71917
- Rule IDs
-
- SV-204414r982198_rule
- SV-86541
Checks: C-4538r809185_chk
The "maxclassrepeat" option sets the maximum number of allowed same consecutive characters in the same class in the new password. Check for the value of the "maxclassrepeat" option in "/etc/security/pwquality.conf" with the following command: $ sudo grep maxclassrepeat /etc/security/pwquality.conf maxclassrepeat = 4 If the value of "maxclassrepeat" is set to "0", more than "4" or is commented out, this is a finding.
Fix: F-4538r88435_fix
Configure the operating system to require the change of the number of repeating characters of the same character class when passwords are changed by setting the "maxclassrepeat" option. Add the following line to "/etc/security/pwquality.conf" conf (or modify the line to have the required value): maxclassrepeat = 4
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000196
- Version
- RHEL-07-010200
- Vuln IDs
-
- V-204415
- V-71919
- Rule IDs
-
- SV-204415r982199_rule
- SV-86543
Checks: C-4539r880831_chk
Verify the PAM system service is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512. Check that the system is configured to create SHA512 hashed passwords with the following command: # grep password /etc/pam.d/system-auth /etc/pam.d/password-auth Outcome should look like following: /etc/pam.d/system-auth-ac:password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok /etc/pam.d/password-auth:password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok If the "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" configuration files allow for password hashes other than SHA512 to be used, this is a finding.
Fix: F-4539r917815_fix
Configure the operating system to store only SHA512 encrypted representations of passwords. Add the following line in "/etc/pam.d/system-auth": password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok Add the following line in "/etc/pam.d/password-auth": password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok Note: Per requirement RHEL-07-010199, RHEL 7 must be configured to not overwrite custom authentication configuration settings while using the authconfig utility; otherwise, manual changes to the listed files will be overwritten whenever the authconfig utility is used.
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000196
- Version
- RHEL-07-010210
- Vuln IDs
-
- V-204416
- V-71921
- Rule IDs
-
- SV-204416r982199_rule
- SV-86545
Checks: C-4540r88440_chk
Verify the system's shadow file is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512. Check that the system is configured to create SHA512 hashed passwords with the following command: # grep -i encrypt /etc/login.defs ENCRYPT_METHOD SHA512 If the "/etc/login.defs" configuration file does not exist or allows for password hashes other than SHA512 to be used, this is a finding.
Fix: F-4540r88441_fix
Configure the operating system to store only SHA512 encrypted representations of passwords. Add or update the following line in "/etc/login.defs": ENCRYPT_METHOD SHA512
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000196
- Version
- RHEL-07-010220
- Vuln IDs
-
- V-204417
- V-71923
- Rule IDs
-
- SV-204417r982199_rule
- SV-86547
Checks: C-4541r88443_chk
Verify the user and group account administration utilities are configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is "SHA512". Check that the system is configured to create "SHA512" hashed passwords with the following command: # grep -i sha512 /etc/libuser.conf crypt_style = sha512 If the "crypt_style" variable is not set to "sha512", is not in the defaults section, is commented out, or does not exist, this is a finding.
Fix: F-4541r88444_fix
Configure the operating system to store only SHA512 encrypted representations of passwords. Add or update the following line in "/etc/libuser.conf" in the [defaults] section: crypt_style = sha512
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000198
- Version
- RHEL-07-010230
- Vuln IDs
-
- V-204418
- V-71925
- Rule IDs
-
- SV-204418r982188_rule
- SV-86549
Checks: C-4542r88446_chk
Verify the operating system enforces 24 hours/1 day as the minimum password lifetime for new user accounts. Check for the value of "PASS_MIN_DAYS" in "/etc/login.defs" with the following command: # grep -i pass_min_days /etc/login.defs PASS_MIN_DAYS 1 If the "PASS_MIN_DAYS" parameter value is not "1" or greater, or is commented out, this is a finding.
Fix: F-4542r88447_fix
Configure the operating system to enforce 24 hours/1 day as the minimum password lifetime. Add the following line in "/etc/login.defs" (or modify the line to have the required value): PASS_MIN_DAYS 1
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000198
- Version
- RHEL-07-010240
- Vuln IDs
-
- V-204419
- V-71927
- Rule IDs
-
- SV-204419r982188_rule
- SV-86551
Checks: C-4543r88449_chk
Check whether the minimum time period between password changes for each user account is one day or greater. # awk -F: '$4 < 1 {print $1 " " $4}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding.
Fix: F-4543r88450_fix
Configure non-compliant accounts to enforce a 24 hours/1 day minimum password lifetime: # chage -m 1 [user]
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000199
- Version
- RHEL-07-010250
- Vuln IDs
-
- V-204420
- V-71929
- Rule IDs
-
- SV-204420r982200_rule
- SV-86553
Checks: C-4544r88452_chk
If passwords are not being used for authentication, this is Not Applicable. Verify the operating system enforces a 60-day maximum password lifetime restriction for new user accounts. Check for the value of "PASS_MAX_DAYS" in "/etc/login.defs" with the following command: # grep -i pass_max_days /etc/login.defs PASS_MAX_DAYS 60 If the "PASS_MAX_DAYS" parameter value is not 60 or less, or is commented out, this is a finding.
Fix: F-4544r88453_fix
Configure the operating system to enforce a 60-day maximum password lifetime restriction. Add the following line in "/etc/login.defs" (or modify the line to have the required value): PASS_MAX_DAYS 60
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000199
- Version
- RHEL-07-010260
- Vuln IDs
-
- V-204421
- V-71931
- Rule IDs
-
- SV-204421r982200_rule
- SV-86555
Checks: C-4545r88455_chk
Check whether the maximum time period for existing passwords is restricted to 60 days. # awk -F: '$5 > 60 {print $1 " " $5}' /etc/shadow If any results are returned that are not associated with a system account, this is a finding.
Fix: F-4545r88456_fix
Configure non-compliant accounts to enforce a 60-day maximum password lifetime restriction. # chage -M 60 [user]
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000200
- Version
- RHEL-07-010270
- Vuln IDs
-
- V-204422
- V-71933
- Rule IDs
-
- SV-204422r982201_rule
- SV-86557
Checks: C-4546r880834_chk
Verify the operating system prohibits password reuse for a minimum of five generations. Check for the value of the "remember" argument in "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" with the following command: # grep -i remember /etc/pam.d/system-auth /etc/pam.d/password-auth password requisite pam_pwhistory.so use_authtok remember=5 retry=3 If the line containing the "pam_pwhistory.so" line does not have the "remember" module argument set, is commented out, or the value of the "remember" module argument is set to less than "5", this is a finding.
Fix: F-4546r917817_fix
Configure the operating system to prohibit password reuse for a minimum of five generations. Add the following line in "/etc/pam.d/system-auth" (or modify the line to have the required value): password requisite pam_pwhistory.so remember=5 retry=3 Add the following line in "/etc/pam.d/password-auth" (or modify the line to have the required value): password requisite pam_pwhistory.so use_authtok remember=5 retry=3 Note: Per requirement RHEL-07-010199, RHEL 7 must be configured to not overwrite custom authentication configuration settings while using the authconfig utility; otherwise, manual changes to the listed files will be overwritten whenever the authconfig utility is used.
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000205
- Version
- RHEL-07-010280
- Vuln IDs
-
- V-204423
- V-71935
- Rule IDs
-
- SV-204423r982202_rule
- SV-86559
Checks: C-4547r88461_chk
Verify the operating system enforces a minimum 15-character password length. The "minlen" option sets the minimum number of characters in a new password. Check for the value of the "minlen" option in "/etc/security/pwquality.conf" with the following command: # grep minlen /etc/security/pwquality.conf minlen = 15 If the command does not return a "minlen" value of 15 or greater, this is a finding.
Fix: F-4547r88462_fix
Configure operating system to enforce a minimum 15-character password length. Add the following line to "/etc/security/pwquality.conf" (or modify the line to have the required value): minlen = 15
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-010290
- Vuln IDs
-
- V-204424
- V-71937
- Rule IDs
-
- SV-204424r991589_rule
- SV-86561
Checks: C-4548r880837_chk
To verify that null passwords cannot be used, run the following command: # grep nullok /etc/pam.d/system-auth /etc/pam.d/password-auth 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-4548r880838_fix
If an account is configured for password authentication but does not have an assigned password, it may be possible to log on to the account without authenticating. Remove any instances of the "nullok" option in "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" to prevent logons with empty passwords. Note: Per requirement RHEL-07-010199, RHEL 7 must be configured to not overwrite custom authentication configuration settings while using the authconfig utility, otherwise manual changes to the listed files will be overwritten whenever the authconfig utility is used.
- RMF Control
- IA-2
- Severity
- High
- CCI
- CCI-000766
- Version
- RHEL-07-010300
- Vuln IDs
-
- V-204425
- V-71939
- Rule IDs
-
- SV-204425r958486_rule
- SV-86563
Checks: C-4549r88467_chk
To determine how the SSH daemon's "PermitEmptyPasswords" option is set, run the following command: # grep -i PermitEmptyPasswords /etc/ssh/sshd_config PermitEmptyPasswords no If no line, a commented line, or a line indicating the value "no" is returned, the required value is set. If the required value is not set, this is a finding.
Fix: F-4549r88468_fix
To explicitly disallow remote logon from accounts with empty passwords, add or correct the following line in "/etc/ssh/sshd_config": PermitEmptyPasswords no The SSH service must be restarted for changes to take effect. Any accounts with empty passwords should be disabled immediately, and PAM configuration should prevent users from being able to assign themselves empty passwords.
- RMF Control
- IA-4
- Severity
- Medium
- CCI
- CCI-000795
- Version
- RHEL-07-010310
- Vuln IDs
-
- V-204426
- V-71941
- Rule IDs
-
- SV-204426r982189_rule
- SV-86565
Checks: C-4550r928566_chk
If passwords are not being used for authentication, this is Not Applicable. Verify the operating system disables account identifiers (individuals, groups, roles, and devices) after the password has expired with the following command: # grep -i inactive /etc/default/useradd INACTIVE=35 If "INACTIVE" is set to "-1", a value greater than "35", is commented out, or is not defined, this is a finding.
Fix: F-4550r928567_fix
Configure the operating system to disable account identifiers (individuals, groups, roles, and devices) 35 days after the password has expired. Add the following line to "/etc/default/useradd" (or modify the line to have the required value): INACTIVE=35 DOD recommendation is 35 days, but a lower value is acceptable. The value "-1" will disable this feature, and "0" will disable the account immediately after the password expires.
- RMF Control
- AC-7
- Severity
- Medium
- CCI
- CCI-000044
- Version
- RHEL-07-010320
- Vuln IDs
-
- V-204427
- V-71943
- Rule IDs
-
- SV-204427r958736_rule
- SV-86567
Checks: C-4551r880840_chk
Check that the system locks an account for a minimum of 15 minutes after three unsuccessful logon attempts within a period of 15 minutes with the following command: # grep pam_faillock.so /etc/pam.d/password-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "deny" parameter is set to "0" or a value greater than "3" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "even_deny_root" parameter is not set on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "fail_interval" parameter is set to "0" or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. Note: The maximum configurable value for "unlock_time" is "604800". If any line referencing the "pam_faillock.so" module is commented out, this is a finding. # grep pam_faillock.so /etc/pam.d/system-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "deny" parameter is set to "0" or a value greater than "3" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "even_deny_root" parameter is not set on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "fail_interval" parameter is set to "0" or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module, or is missing from these lines, this is a finding. If the "unlock_time" parameter is not set to "0", "never", or is set to a value less than "900" on both "auth" lines with the "pam_faillock.so" module or is missing from these lines, this is a finding. Note: The maximum configurable value for "unlock_time" is "604800". If any line referencing the "pam_faillock.so" module is commented out, this is a finding.
Fix: F-4551r880841_fix
Configure the operating system to lock an account for the maximum period when three unsuccessful logon attempts in 15 minutes are made. Add/Modify the appropriate sections of the "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" files to match the following lines: auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth sufficient pam_unix.so try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so Note: Per requirement RHEL-07-010199, RHEL 7 must be configured to not overwrite custom authentication configuration settings while using the authconfig utility, otherwise manual changes to the listed files will be overwritten whenever the authconfig utility is used.
- RMF Control
- AC-7
- Severity
- Medium
- CCI
- CCI-002238
- Version
- RHEL-07-010330
- Vuln IDs
-
- V-204428
- V-71945
- Rule IDs
-
- SV-204428r958736_rule
- SV-86569
Checks: C-4552r880843_chk
Verify the operating system automatically locks the root account, for a minimum of 15 minutes, when three unsuccessful logon attempts in 15 minutes are made. # grep pam_faillock.so /etc/pam.d/password-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "even_deny_root" setting is not defined on both lines with the "pam_faillock.so" module, is commented out, or is missing from a line, this is a finding. # grep pam_faillock.so /etc/pam.d/system-auth auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so If the "even_deny_root" setting is not defined on both lines with the "pam_faillock.so" module, is commented out, or is missing from a line, this is a finding.
Fix: F-4552r880844_fix
Configure the operating system to automatically lock the root account, for a minimum of 15 minutes, when three unsuccessful logon attempts in 15 minutes are made. Modify the first three lines of the auth section and the first line of the account section of the "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" files to match the following lines: auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth sufficient pam_unix.so try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so Note: Per requirement RHEL-07-010199, RHEL 7 must be configured to not overwrite custom authentication configuration settings while using the authconfig utility, otherwise manual changes to the listed files will be overwritten whenever the authconfig utility is used.
- RMF Control
- IA-11
- Severity
- Medium
- CCI
- CCI-002038
- Version
- RHEL-07-010340
- Vuln IDs
-
- V-204429
- V-71947
- Rule IDs
-
- SV-204429r987879_rule
- SV-86571
Checks: C-36340r861001_chk
Verify the operating system requires users to supply a password for privilege escalation. Check the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command: $ sudo grep -ir nopasswd /etc/sudoers /etc/sudoers.d If any occurrences of "NOPASSWD" are returned from the command and have not been documented with the Information System Security Officer (ISSO) as an organizationally defined administrative group utilizing MFA, this is a finding.
Fix: F-36303r861002_fix
Configure the operating system to require users to supply a password for privilege escalation. Check the configuration of the "/etc/sudoers" file with the following command: $ sudo visudo Remove any occurrences of "NOPASSWD" tags in the file. Check the configuration of the /etc/sudoers.d/* files with the following command: $ sudo grep -ir nopasswd /etc/sudoers.d Remove any occurrences of "NOPASSWD" tags in the file.
- RMF Control
- IA-11
- Severity
- Medium
- CCI
- CCI-002038
- Version
- RHEL-07-010350
- Vuln IDs
-
- V-204430
- V-71949
- Rule IDs
-
- SV-204430r987879_rule
- SV-86573
Checks: C-4554r88482_chk
Verify the operating system requires users to reauthenticate for privilege escalation. Check the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command: # grep -i authenticate /etc/sudoers /etc/sudoers.d/* If any uncommented line is found with a "!authenticate" tag, this is a finding.
Fix: F-4554r88483_fix
Configure the operating system to require users to reauthenticate for privilege escalation. Check the configuration of the "/etc/sudoers" file with the following command: # visudo Remove any occurrences of "!authenticate" tags in the file. Check the configuration of the "/etc/sudoers.d/*" files with the following command: # grep -i authenticate /etc/sudoers /etc/sudoers.d/* Remove any occurrences of "!authenticate" tags in the file(s).
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010430
- Vuln IDs
-
- V-204431
- V-71951
- Rule IDs
-
- SV-204431r991588_rule
- SV-86575
Checks: C-4555r88485_chk
Verify the operating system enforces a delay of at least four seconds between console logon prompts following a failed logon attempt. Check the value of the "fail_delay" parameter in the "/etc/login.defs" file with the following command: # grep -i fail_delay /etc/login.defs FAIL_DELAY 4 If the value of "FAIL_DELAY" is not set to "4" or greater, or the line is commented out, this is a finding.
Fix: F-4555r88486_fix
Configure the operating system to enforce a delay of at least four seconds between logon prompts following a failed console logon attempt. Modify the "/etc/login.defs" file to set the "FAIL_DELAY" parameter to "4" or greater: FAIL_DELAY 4
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-010440
- Vuln IDs
-
- V-204432
- V-71953
- Rule IDs
-
- SV-204432r991591_rule
- SV-86577
Checks: C-4556r88488_chk
Verify the operating system does not allow an unattended or automatic logon to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check for the value of the "AutomaticLoginEnable" in the "/etc/gdm/custom.conf" file with the following command: # grep -i automaticloginenable /etc/gdm/custom.conf AutomaticLoginEnable=false If the value of "AutomaticLoginEnable" is not set to "false", this is a finding.
Fix: F-4556r88489_fix
Configure the operating system to not allow an unattended or automatic logon to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Add or edit the line for the "AutomaticLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false": [daemon] AutomaticLoginEnable=false
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-010450
- Vuln IDs
-
- V-204433
- V-71955
- Rule IDs
-
- SV-204433r991591_rule
- SV-86579
Checks: C-4557r88491_chk
Verify the operating system does not allow an unrestricted logon to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Check for the value of the "TimedLoginEnable" parameter in "/etc/gdm/custom.conf" file with the following command: # grep -i timedloginenable /etc/gdm/custom.conf TimedLoginEnable=false If the value of "TimedLoginEnable" is not set to "false", this is a finding.
Fix: F-4557r88492_fix
Configure the operating system to not allow an unrestricted account to log on to the system via a graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Add or edit the line for the "TimedLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false": [daemon] TimedLoginEnable=false
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010460
- Vuln IDs
-
- V-204434
- V-71957
- Rule IDs
-
- SV-204434r991591_rule
- SV-86581
Checks: C-4558r88494_chk
Verify the operating system does not allow users to override environment variables to the SSH daemon. Check for the value of the "PermitUserEnvironment" keyword with the following command: # grep -i permituserenvironment /etc/ssh/sshd_config PermitUserEnvironment no If the "PermitUserEnvironment" keyword is not set to "no", is missing, or is commented out, this is a finding.
Fix: F-4558r88495_fix
Configure the operating system to not allow users to override environment variables to the SSH daemon. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for "PermitUserEnvironment" keyword and set the value to "no": PermitUserEnvironment no The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010470
- Vuln IDs
-
- V-204435
- V-71959
- Rule IDs
-
- SV-204435r991591_rule
- SV-86583
Checks: C-4559r88497_chk
Verify the operating system does not allow a non-certificate trusted host SSH logon to the system. Check for the value of the "HostbasedAuthentication" keyword with the following command: # grep -i hostbasedauthentication /etc/ssh/sshd_config HostbasedAuthentication no If the "HostbasedAuthentication" keyword is not set to "no", is missing, or is commented out, this is a finding.
Fix: F-4559r88498_fix
Configure the operating system to not allow a non-certificate trusted host SSH logon to the system. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for "HostbasedAuthentication" keyword and set the value to "no": HostbasedAuthentication no The SSH service must be restarted for changes to take effect.
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-000213
- Version
- RHEL-07-010481
- Vuln IDs
-
- V-204437
- V-77823
- Rule IDs
-
- SV-204437r958472_rule
- SV-92519
Checks: C-4561r88503_chk
Verify the operating system must require authentication upon booting into single-user and maintenance modes. Check that the operating system requires authentication upon booting into single-user mode with the following command: # grep -i execstart /usr/lib/systemd/system/rescue.service | grep -i sulogin ExecStart=-/bin/sh -c "/usr/sbin/sulogin; /usr/bin/systemctl --fail --no-block default" If "ExecStart" does not have "/usr/sbin/sulogin" as an option, this is a finding.
Fix: F-4561r88504_fix
Configure the operating system to require authentication upon booting into single-user and maintenance modes. Add or modify the "ExecStart" line in "/usr/lib/systemd/system/rescue.service" to include "/usr/sbin/sulogin": ExecStart=-/bin/sh -c "/usr/sbin/sulogin; /usr/bin/systemctl --fail --no-block default"
- RMF Control
- AC-3
- Severity
- High
- CCI
- CCI-000213
- Version
- RHEL-07-010482
- Vuln IDs
-
- V-204438
- V-81005
- Rule IDs
-
- SV-204438r958472_rule
- SV-95717
Checks: C-4562r744093_chk
For systems that use UEFI, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Check to see if an encrypted grub superusers password is set. On systems that use a BIOS, use the following command: $ sudo grep -iw grub2_password /boot/grub2/user.cfg GRUB2_PASSWORD=grub.pbkdf2.sha512.[password_hash] If the grub superusers password does not begin with "grub.pbkdf2.sha512", this is a finding.
Fix: F-4562r744094_fix
Configure the system to encrypt the boot password for the grub superusers account with the grub2-setpassword command, which creates/overwrites the /boot/grub2/user.cfg file. Generate an encrypted grub2 password for the grub superusers account with the following command: $ sudo grub2-setpassword Enter password: Confirm password:
- RMF Control
- AC-3
- Severity
- High
- CCI
- CCI-000213
- Version
- RHEL-07-010491
- Vuln IDs
-
- V-204440
- V-81007
- Rule IDs
-
- SV-204440r958472_rule
- SV-95719
Checks: C-4564r744096_chk
For systems that use BIOS, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Check to see if an encrypted grub superusers password is set. On systems that use UEFI, use the following command: $ sudo grep -iw grub2_password /boot/efi/EFI/redhat/user.cfg GRUB2_PASSWORD=grub.pbkdf2.sha512.[password_hash] If the grub superusers password does not begin with "grub.pbkdf2.sha512", this is a finding.
Fix: F-4564r744097_fix
Configure the system to encrypt the boot password for the grub superusers account with the grub2-setpassword command, which creates/overwrites the /boot/efi/EFI/redhat/user.cfg file. Generate an encrypted grub2 password for the grub superusers account with the following command: $ sudo grub2-setpassword Enter password: Confirm password:
- RMF Control
- IA-2
- Severity
- Medium
- CCI
- CCI-000766
- Version
- RHEL-07-010500
- Vuln IDs
-
- V-204441
- V-71965
- Rule IDs
-
- SV-204441r958482_rule
- SV-86589
Checks: C-4565r818812_chk
Verify the operating system requires multifactor authentication to uniquely identify organizational users using multifactor authentication. Check to see if smartcard authentication is enforced on the system: # authconfig --test | grep "pam_pkcs11 is enabled" If no results are returned, this is a finding. # authconfig --test | grep "smartcard removal action" If "smartcard removal action" is blank, this is a finding. # authconfig --test | grep "smartcard module" If any of the above checks are not configured, ask the administrator to indicate the AO-approved multifactor authentication in use and the configuration to support it. If there is no evidence of multifactor authentication, this is a finding.
Fix: F-4565r88516_fix
Configure the operating system to require individuals to be authenticated with a multifactor authenticator. Enable smartcard logons with the following commands: # authconfig --enablesmartcard --smartcardaction=0 --update # authconfig --enablerequiresmartcard -update Modify the "/etc/pam_pkcs11/pkcs11_eventmgr.conf" file to uncomment the following line: #/usr/X11R6/bin/xscreensaver-command -lock Modify the "/etc/pam_pkcs11/pam_pkcs11.conf" file to use the cackey module if required.
- RMF Control
- CM-7
- Severity
- High
- CCI
- CCI-000381
- Version
- RHEL-07-020000
- Vuln IDs
-
- V-204442
- V-71967
- Rule IDs
-
- SV-204442r958478_rule
- SV-86591
Checks: C-4566r88518_chk
Check to see if the rsh-server package is installed with the following command: # yum list installed rsh-server If the rsh-server package is installed, this is a finding.
Fix: F-4566r88519_fix
Configure the operating system to disable non-essential capabilities by removing the rsh-server package from the system with the following command: # yum remove rsh-server
- RMF Control
- CM-7
- Severity
- High
- CCI
- CCI-000381
- Version
- RHEL-07-020010
- Vuln IDs
-
- V-204443
- V-71969
- Rule IDs
-
- SV-204443r958478_rule
- SV-86593
Checks: C-4567r88521_chk
The NIS service provides an unencrypted authentication service that does not provide for the confidentiality and integrity of user passwords or the remote session. Check to see if the "ypserve" package is installed with the following command: # yum list installed ypserv If the "ypserv" package is installed, this is a finding.
Fix: F-4567r88522_fix
Configure the operating system to disable non-essential capabilities by removing the "ypserv" package from the system with the following command: # yum remove ypserv
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020020
- Vuln IDs
-
- V-204444
- V-71971
- Rule IDs
-
- SV-204444r958726_rule
- SV-86595
Checks: C-4568r928569_chk
Verify the operating system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. Get a list of authorized users for the system. Check the list against the system by using the following command: $ sudo semanage login -l | more Login Name SELinux User MLS/MCS Range Service __default__ user_u s0-s0:c0.c1023 * root unconfined_u s0-s0:c0.c1023 * system_u system_u s0-s0:c0.c1023 * joe staff_u s0-s0:c0.c1023 * All administrators must be mapped to the , "staff_u", or an appropriately tailored confined SELinux user as defined by the organization. All authorized non-administrative users must be mapped to the "user_u" SELinux user. If they are not mapped in this way, this is a finding. If administrator accounts are mapped to the "sysadm_u" SELinux user and are not documented as an operational requirement with the ISSO, this is a finding. If administrator accounts are mapped to the "sysadm_u" SELinux user and are documented as an operational requirement with the ISSO, this can be downgraded to a CAT III.
Fix: F-4568r928570_fix
Configure the operating system to prevent non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. Use the following command to map a new user to the "staff_u" SELinux user: $ sudo semanage login -a -s staff_u <username> Use the following command to map an existing user to the "staff_u" SELinux user: $ sudo semanage login -m -s staff_u <username> Use the following command to map a new user to the "user_u" SELinux user: $ sudo semanage login -a -s user_u <username> Use the following command to map an existing user to the "user_u" SELinux user: $ sudo semanage login -m -s user_u <username>
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-001744
- Version
- RHEL-07-020030
- Vuln IDs
-
- V-204445
- V-71973
- Rule IDs
-
- SV-204445r958794_rule
- SV-86597
Checks: C-36341r880846_chk
Verify the operating system routinely checks the baseline configuration for unauthorized changes. 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 the presence of a cron job running daily or weekly on the system that executes AIDE daily to scan for changes to the system baseline. The command used in the example will use a daily occurrence. Check the cron directories for a script file controlling the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command: # ls -al /etc/cron.* | grep aide -rwxr-xr-x 1 root root 602 Mar 6 20:02 aide # grep aide /etc/crontab /var/spool/cron/root /etc/crontab: 30 04 * * * root /usr/sbin/aide --check /var/spool/cron/root: 30 04 * * * /usr/sbin/aide --check If the file integrity application does not exist, or a script file controlling the execution of the file integrity application does not exist, this is a finding.
Fix: F-36304r902697_fix
Configure the file integrity tool to run automatically on the system at least weekly. The following example output is generic. It will set cron to run AIDE daily, but other file integrity tools may be used: # more /etc/cron.daily/aide #!/bin/bash /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil Note: Per requirement RHEL-07-020028, the "mailx" package must be installed on the system to enable email functionality.
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-001744
- Version
- RHEL-07-020040
- Vuln IDs
-
- V-204446
- V-71975
- Rule IDs
-
- SV-204446r958794_rule
- SV-86599
Checks: C-36342r902699_chk
Verify the operating system notifies designated personnel if baseline configurations are changed in an unauthorized manner. Note: A file integrity tool other than Advanced Intrusion Detection Environment (AIDE) may be used, but the tool must be executed and notify specified individuals via email or an alert. Check for the presence of a cron job running routinely on the system that executes AIDE to scan for changes to the system baseline. The commands used in the example will use a daily occurrence. Check the cron directories for a "crontab" script file controlling the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command: # ls -al /etc/cron.* | grep aide -rwxr-xr-x 1 root root 602 Mar 6 20:02 aide # grep aide /etc/crontab /var/spool/cron/root /etc/crontab: 30 04 * * * root /usr/sbin/aide --check /var/spool/cron/root: 30 04 * * * /usr/sbin/aide --check AIDE does not have a configuration that will send a notification, so the cron job uses the mail application on the system to email the results of the file integrity run as in the following example: # more /etc/cron.daily/aide #!/bin/bash /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil If the file integrity application does not notify designated personnel of changes, this is a finding.
Fix: F-36305r902700_fix
Configure the operating system to notify designated personnel if baseline configurations are changed in an unauthorized manner. The AIDE tool can be configured to email designated personnel with the use of the cron system. The following example output is generic. It will set cron to run AIDE daily and to send email at the completion of the analysis. # more /etc/cron.daily/aide /usr/sbin/aide --check | /bin/mail -s "$HOSTNAME - Daily AIDE integrity check run" root@example_server_name.mil Note: Per requirement RHEL-07-020028, the "mailx" package must be installed on the system to enable email functionality.
- RMF Control
- CM-5
- Severity
- High
- CCI
- CCI-001749
- Version
- RHEL-07-020050
- Vuln IDs
-
- V-204447
- V-71977
- Rule IDs
-
- SV-204447r982212_rule
- SV-86601
Checks: C-4571r88533_chk
Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components from a repository without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that yum verifies the signature of packages from a repository prior to install with the following command: # grep gpgcheck /etc/yum.conf gpgcheck=1 If "gpgcheck" is not set to "1", or if options are missing or commented out, ask the System Administrator how the certificates for patches and other operating system components are verified. If there is no process to validate certificates that is approved by the organization, this is a finding.
Fix: F-4571r88534_fix
Configure the operating system to verify the signature of packages from a repository prior to install by setting the following option in the "/etc/yum.conf" file: gpgcheck=1
- RMF Control
- CM-5
- Severity
- High
- CCI
- CCI-001749
- Version
- RHEL-07-020060
- Vuln IDs
-
- V-204448
- V-71979
- Rule IDs
-
- SV-204448r982212_rule
- SV-86603
Checks: C-4572r88536_chk
Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components of local packages without verification that they have been digitally signed using a certificate that is recognized and approved by the organization. Check that yum verifies the signature of local packages prior to install with the following command: # grep localpkg_gpgcheck /etc/yum.conf localpkg_gpgcheck=1 If "localpkg_gpgcheck" is not set to "1", or if options are missing or commented out, ask the System Administrator how the signatures of local packages and other operating system components are verified. If there is no process to validate the signatures of local packages that is approved by the organization, this is a finding.
Fix: F-4572r88537_fix
Configure the operating system to verify the signature of local packages prior to install by setting the following option in the "/etc/yum.conf" file: localpkg_gpgcheck=1
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020100
- Vuln IDs
-
- V-204449
- V-71983
- Rule IDs
-
- SV-204449r958498_rule
- SV-86607
Checks: C-4573r942892_chk
Verify the operating system disables the ability to load the USB Storage kernel module. # grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/false" | grep -v "^#" install usb-storage /bin/false If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Check to see if USB mass storage is disabled with the following command: # grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the ISSO as an operational requirement, this is a finding.
Fix: F-4573r942893_fix
Configure the operating system to disable the ability to use the USB Storage kernel module. Create a file under "/etc/modprobe.d" with the following command: # touch /etc/modprobe.d/usb-storage.conf Add the following line to the created file: install usb-storage /bin/false Configure the operating system to disable the ability to use USB mass storage devices. # vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist usb-storage
- RMF Control
- IA-3
- Severity
- Medium
- CCI
- CCI-001958
- Version
- RHEL-07-020101
- Vuln IDs
-
- V-204450
- V-77821
- Rule IDs
-
- SV-204450r958820_rule
- SV-92517
Checks: C-4574r942895_chk
Verify the operating system disables the ability to load the DCCP kernel module. # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/false" | grep -v "^#" install dccp /bin/false If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use the DCCP kernel module. Check to see if the DCCP kernel module is disabled with the following command: # grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#" blacklist dccp If the command does not return any output or the output is not "blacklist dccp", and use of the dccp kernel module is not documented with the ISSO as an operational requirement, this is a finding.
Fix: F-4574r942896_fix
Configure the operating system to disable the ability to use the DCCP kernel module. Create a file under "/etc/modprobe.d" with the following command: # touch /etc/modprobe.d/dccp.conf Add the following line to the created file: install dccp /bin/false Ensure that the DCCP module is blacklisted: # vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist dccp
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020110
- Vuln IDs
-
- V-204451
- V-71985
- Rule IDs
-
- SV-204451r958498_rule
- SV-86609
Checks: C-4575r88545_chk
Verify the 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-4575r88546_fix
Configure the operating system to disable the ability to automount devices. Turn off the automount service with the following commands: # systemctl stop autofs # systemctl disable autofs If "autofs" is required for Network File System (NFS), it must be documented with the ISSO.
- RMF Control
- SI-2
- Severity
- Low
- CCI
- CCI-002617
- Version
- RHEL-07-020200
- Vuln IDs
-
- V-204452
- V-71987
- Rule IDs
-
- SV-204452r958936_rule
- SV-86611
Checks: C-4576r88548_chk
Verify the operating system removes all software components after updated versions have been installed. Check if yum is configured to remove unneeded packages with the following command: # grep -i clean_requirements_on_remove /etc/yum.conf clean_requirements_on_remove=1 If "clean_requirements_on_remove" is not set to "1", "True", or "yes", or is not set in "/etc/yum.conf", this is a finding.
Fix: F-4576r88549_fix
Configure the operating system to remove all software components after updated versions have been installed. Set the "clean_requirements_on_remove" option to "1" in the "/etc/yum.conf" file: clean_requirements_on_remove=1
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020210
- Vuln IDs
-
- V-204453
- V-71989
- Rule IDs
-
- SV-204453r958944_rule
- SV-86613
Checks: C-36343r942898_chk
Verify the operating system verifies correct operation of all security functions. Check if "SELinux" is active and in "Enforcing" mode with the following command: # getenforce Enforcing If "SELinux" is not active and not in "Enforcing" mode, this is a finding.
Fix: F-36306r942899_fix
Configure the operating system to verify correct operation of all security functions. Set the "SELinux" status and the "Enforcing" mode by modifying the "/etc/selinux/config" file to have the following line: SELINUX=enforcing A reboot is required for the changes to take effect.
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020220
- Vuln IDs
-
- V-204454
- V-71991
- Rule IDs
-
- SV-204454r958944_rule
- SV-86615
Checks: C-36344r942901_chk
Verify the operating system verifies correct operation of all security functions. Check if "SELinux" is active and is enforcing the targeted policy with the following command: # sestatus SELinux status: enabled SELinuxfs mount: /selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: allowed Max kernel policy version: 28 If the "Loaded policy name" is not set to "targeted", this is a finding. Verify that the /etc/selinux/config file is configured to the "SELINUXTYPE" to "targeted": # grep -i "selinuxtype" /etc/selinux/config | grep -v '^#' SELINUXTYPE = targeted If no results are returned or "SELINUXTYPE" is not set to "targeted", this is a finding.
Fix: F-36307r942902_fix
Configure the operating system to verify correct operation of all security functions. Set the "SELinuxtype" to the "targeted" policy by modifying the "/etc/selinux/config" file to have the following line: SELINUXTYPE=targeted A reboot is required for the changes to take effect.
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-020230
- Vuln IDs
-
- V-204455
- V-71993
- Rule IDs
-
- SV-204455r991589_rule
- SV-86617
Checks: C-4579r928572_chk
Verify the operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed. Check that the ctrl-alt-del.target is masked and not active with the following command: # systemctl status ctrl-alt-del.target ctrl-alt-del.target Loaded: masked (/dev/null; bad) Active: inactive (dead) If the ctrl-alt-del.target is not masked, this is a finding. If the ctrl-alt-del.target is active, this is a finding.
Fix: F-4579r928573_fix
Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following commands: # systemctl disable ctrl-alt-del.target # systemctl mask ctrl-alt-del.target
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-020231
- Vuln IDs
-
- V-204456
- V-94843
- Rule IDs
-
- SV-204456r991589_rule
- SV-104673
Checks: C-4580r590040_chk
Note: If the operating system does not have a graphical user interface installed, this requirement is Not Applicable. Verify the operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed. Check that the ctrl-alt-del.target is masked and not active in the graphical user interface with the following command: # grep logout /etc/dconf/db/local.d/* logout='' If "logout" is not set to use two single quotations, or is missing, this is a finding.
Fix: F-4580r590041_fix
Configure the system to disable the Ctrl-Alt-Delete sequence for the graphical user interface with the following command: # touch /etc/dconf/db/local.d/00-disable-CAD Add the setting to disable the Ctrl-Alt-Delete sequence for the graphical user interface: [org/gnome/settings-daemon/plugins/media-keys] logout=''
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020240
- Vuln IDs
-
- V-204457
- V-71995
- Rule IDs
-
- SV-204457r991590_rule
- SV-86619
Checks: C-4581r88563_chk
Verify the operating system defines default permissions for all authenticated users in such a way that the user can only read and modify their own files. Check for the value of the "UMASK" parameter in "/etc/login.defs" file with the following command: Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the Severity is raised to a CAT I. # grep -i umask /etc/login.defs UMASK 077 If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.
Fix: F-4581r88564_fix
Configure the operating system to define default permissions for all authenticated users in such a way that the user can only read and modify their own files. Add or edit the line for the "UMASK" parameter in "/etc/login.defs" file to "077": UMASK 077
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-020250
- Vuln IDs
-
- V-204458
- V-71997
- Rule IDs
-
- SV-204458r991589_rule
- SV-86621
Checks: C-4582r986306_chk
Verify the version of the operating system is vendor supported. Check the version of the operating system with the following command: # cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.9 (Maipo) Current End of Maintenance Support for RHEL 7.9 is 30 June 2024. If the release is not supported by the vendor, this is a finding.
Fix: F-4582r462547_fix
Upgrade to a supported version of the operating system.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020260
- Vuln IDs
-
- V-204459
- V-71999
- Rule IDs
-
- SV-204459r991589_rule
- SV-86623
Checks: C-4583r88569_chk
Verify the operating system security patches and updates are installed and up to date. Updates are required to be applied with a frequency determined by the site or Program Management Office (PMO). Obtain the list of available package security updates from Red Hat. The URL for updates is https://rhn.redhat.com/errata/. It is important to note that updates provided by Red Hat may not be present on the system if the underlying packages are not installed. Check that the available package security updates have been installed on the system with the following command: # yum history list | more Loaded plugins: langpacks, product-id, subscription-manager ID | Command line | Date and time | Action(s) | Altered ------------------------------------------------------------------------------- 70 | install aide | 2016-05-05 10:58 | Install | 1 69 | update -y | 2016-05-04 14:34 | Update | 18 EE 68 | install vlc | 2016-04-21 17:12 | Install | 21 67 | update -y | 2016-04-21 17:04 | Update | 7 EE 66 | update -y | 2016-04-15 16:47 | E, I, U | 84 EE If package updates have not been performed on the system within the timeframe that the site/program documentation requires, this is a finding. Typical update frequency may be overridden by Information Assurance Vulnerability Alert (IAVA) notifications from CYBERCOM. If the operating system is in non-compliance with the Information Assurance Vulnerability Management (IAVM) process, this is a finding.
Fix: F-4583r88570_fix
Install the operating system patches or updated packages available from Red Hat within 30 days or sooner as local policy dictates.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020270
- Vuln IDs
-
- V-204460
- V-72001
- Rule IDs
-
- SV-204460r991589_rule
- SV-86625
Checks: C-4584r88572_chk
Verify all accounts on the system 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 bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt games:x:12:100:games:/usr/games:/sbin/nologin gopher:x:13:30:gopher:/var/gopher:/sbin/nologin 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, or accounts that do not support an authorized system function are present, this is a finding.
Fix: F-4584r88573_fix
Configure the 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.
- RMF Control
- IA-2
- Severity
- Low
- CCI
- CCI-000764
- Version
- RHEL-07-020300
- Vuln IDs
-
- V-204461
- V-72003
- Rule IDs
-
- SV-204461r958482_rule
- SV-86627
Checks: C-4585r88575_chk
Verify all GIDs referenced in the "/etc/passwd" file are defined in the "/etc/group" file. Check that all referenced GIDs exist with the following command: # pwck -r If GIDs referenced in "/etc/passwd" file are returned as not defined in "/etc/group" file, this is a finding.
Fix: F-4585r88576_fix
Configure the system to define all GIDs found in the "/etc/passwd" file by modifying the "/etc/group" file to add any non-existent group referenced in the "/etc/passwd" file, or change the GIDs referenced in the "/etc/passwd" file to a group that exists in "/etc/group".
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-020310
- Vuln IDs
-
- V-204462
- V-72005
- Rule IDs
-
- SV-204462r991589_rule
- SV-86629
Checks: C-4586r88578_chk
Check the system for duplicate UID "0" assignments with the following command: # awk -F: '$3 == 0 {print $1}' /etc/passwd If any accounts other than root have a UID of "0", this is a finding.
Fix: F-4586r88579_fix
Change the UID of any account on the system, other than root, 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.
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020320
- Vuln IDs
-
- V-204463
- V-72007
- Rule IDs
-
- SV-204463r991589_rule
- SV-86631
Checks: C-4587r88581_chk
Verify all 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-4587r88582_fix
Either remove all files and directories from the 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: # chown <user> <file>
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020330
- Vuln IDs
-
- V-204464
- V-72009
- Rule IDs
-
- SV-204464r991589_rule
- SV-86633
Checks: C-4588r88584_chk
Verify all 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-4588r88585_fix
Either remove all files and directories from the 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: # chgrp <group> <file>
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020610
- Vuln IDs
-
- V-204466
- V-72013
- Rule IDs
-
- SV-204466r991589_rule
- SV-86637
Checks: C-4590r88590_chk
Verify all 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-4590r88591_fix
Configure the 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
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020620
- Vuln IDs
-
- V-204467
- V-72015
- Rule IDs
-
- SV-204467r991589_rule
- SV-86639
Checks: C-4591r622289_chk
Verify local interactive users on the system have a home directory assigned and the directory 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, $3, $6}' /etc/passwd smithj 1001 /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, or if any interactive users do not have a home directory assigned, this is a finding.
Fix: F-4591r462550_fix
Create home directories to all 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
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020630
- Vuln IDs
-
- V-204468
- V-72017
- Rule IDs
-
- SV-204468r991589_rule
- SV-86641
Checks: C-4592r622291_chk
Verify the assigned home directory of all 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-4592r88597_fix
Change the mode of 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
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020640
- Vuln IDs
-
- V-204469
- V-72019
- Rule IDs
-
- SV-204469r991589_rule
- SV-86643
Checks: C-4593r622293_chk
Verify the assigned home directory of all local interactive users on the system exists. Check the home directory assignment for all local interactive users on the system with the following command: # 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 any home directories referenced in "/etc/passwd" are not owned by the interactive user, this is a finding.
Fix: F-4593r88600_fix
Change the owner of a local interactive user's home directories to that owner. To change the 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". # chown smithj /home/smithj
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020650
- Vuln IDs
-
- V-204470
- V-72021
- Rule IDs
-
- SV-204470r991589_rule
- SV-86645
Checks: C-4594r880762_chk
Verify the assigned home directory of all local interactive users is group-owned by that user's primary GID. Check the home directory assignment for all local interactive users on the system with the following command: # ls -ld $(awk -F: '($3>=1000)&&($7 !~ /nologin/){print $6}' /etc/passwd) -rwxr-x--- 1 smithj users 13 Apr 1 04:20 /home/smithj Check the user's primary group with the following command: # grep $(grep smithj /etc/passwd | awk -F: '{print $4}') /etc/group users:x:250:smithj,marinc,chongt 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-4594r880763_fix
Change the group owner of a 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
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020660
- Vuln IDs
-
- V-204471
- V-72023
- Rule IDs
-
- SV-204471r991589_rule
- SV-86647
Checks: C-4595r744103_chk
Verify all files and directories in a local interactive user's home directory have a valid owner. Check the owner of all files and directories in a local interactive user's home directory with the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". $ sudo ls -lLR /home/smithj -rw-r--r-- 1 smithj smithj 18 Mar 5 17:06 file1 -rw-r--r-- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r--r-- 1 smithj smithj 231 Mar 5 17:06 file3 If any files or directories are found without an owner, this is a finding.
Fix: F-4595r744104_fix
Either remove all files and directories from the system that do not have a valid user, or assign a valid user to all unowned files and directories on RHEL 7 with the "chown" command: Note: The example will be for the user smithj, who has a home directory of "/home/smithj". $ sudo chown smithj /home/smithj/<file or directory>
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020670
- Vuln IDs
-
- V-204472
- V-72025
- Rule IDs
-
- SV-204472r991589_rule
- SV-86649
Checks: C-4596r88608_chk
Verify all files and directories in a local interactive user home directory are group-owned by a group the user is a member of. Check the group owner of all files and directories in a local interactive user's home directory with the following command: Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # ls -lLR /<home directory>/<users home directory>/ -rw-r--r-- 1 smithj smithj 18 Mar 5 17:06 file1 -rw-r--r-- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r--r-- 1 smithj sa 231 Mar 5 17:06 file3 If any files are found with an owner different than the group home directory user, check to see if the user is a member of that group with the following command: # grep smithj /etc/group sa:x:100:juan,shelley,bob,smithj smithj:x:521:smithj If the user is not a member of a group that group owns file(s) in a local interactive user's home directory, this is a finding.
Fix: F-4596r88609_fix
Change the group of a local interactive user's files and directories to a group that the interactive user is a member of. To change the group owner of a local interactive user's files and directories, use the following command: Note: The example will be for the user smithj, who has a home directory of "/home/smithj" and is a member of the users group. # chgrp users /home/smithj/<file>
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020680
- Vuln IDs
-
- V-204473
- V-72027
- Rule IDs
-
- SV-204473r991589_rule
- SV-86651
Checks: C-4597r88611_chk
Verify all files and directories contained in a local interactive user home directory, excluding local initialization files, have a mode of "0750". Check the mode of all non-initialization files in a local interactive user home directory with the following command: Files that begin with a "." are excluded from this requirement. Note: The example will be for the user "smithj", who has a home directory of "/home/smithj". # ls -lLR /home/smithj -rwxr-x--- 1 smithj smithj 18 Mar 5 17:06 file1 -rwxr----- 1 smithj smithj 193 Mar 5 17:06 file2 -rw-r-x--- 1 smithj smithj 231 Mar 5 17:06 file3 If any files are found with a mode more permissive than "0750", this is a finding.
Fix: F-4597r88612_fix
Set the mode on files and directories in the local interactive user home directory with the following command: Note: The example will be for the user smithj, who has a home directory of "/home/smithj" and is a member of the users group. # chmod 0750 /home/smithj/<file>
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020690
- Vuln IDs
-
- V-204474
- V-72029
- Rule IDs
-
- SV-204474r991589_rule
- SV-86653
Checks: C-4598r917819_chk
Verify the local initialization files of all local interactive users are owned by that user. Check the home directory assignment for all nonprivileged users on the system with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj". # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd smithj 1000 /home/smithj 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. Check the owner of all local interactive users' initialization files with the following command: # ls -al /home/smithj/.[^.]* | more -rw-------. 1 smithj users 2984 Apr 27 19:02 .bash_history -rw-r--r--. 1 smithj users 18 Aug 21 2019 .bash_logout -rw-r--r--. 1 smithj users 193 Aug 21 2019 .bash_profile If all local interactive users' initialization files are not owned by that user or root, this is a finding.
Fix: F-4598r917820_fix
Set the owner of the local initialization files for interactive users to either the directory owner or root with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj". # chown smithj /home/smithj/.[^.]*
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020700
- Vuln IDs
-
- V-204475
- V-72031
- Rule IDs
-
- SV-204475r991589_rule
- SV-86655
Checks: C-4599r917822_chk
Verify the local initialization files of all local interactive users are group-owned by that user's primary Group Identifier (GID). Check the home directory assignment for all nonprivileged users on the system with the following command: Note: The example will be for the smithj user, who has a home directory of "/home/smithj" and a primary group of "users". # awk -F: '($4>=1000)&&($7 !~ /nologin/){print $1, $4, $6}' /etc/passwd smithj 1000 /home/smithj # grep 1000 /etc/group users:x:1000:smithj,jonesj,jacksons 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. Check the group owner of all local interactive users' initialization files with the following command: # ls -al /home/smithj/.[^.]* | more -rw-------. 1 smithj users 2984 Apr 27 19:02 .bash_history -rw-r--r--. 1 smithj users 18 Aug 21 2019 .bash_logout -rw-r--r--. 1 smithj users 193 Aug 21 2019 .bash_profile If all local interactive users' initialization files are not group-owned by that user's primary GID, this is a finding.
Fix: F-4599r917823_fix
Change the group owner of a local interactive user's files to the group found in "/etc/passwd" for the user. 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/.[^.]*
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020710
- Vuln IDs
-
- V-204476
- V-72033
- Rule IDs
-
- SV-204476r991589_rule
- SV-86657
Checks: C-4600r917825_chk
Verify that all local initialization files have a mode of "0740" or less permissive. Check the mode on all local initialization files with the following command: Note: The example will be for the "smithj" user, who has a home directory of "/home/smithj". # ls -al /home/smithj/.[^.]* | more -rw-------. 1 smithj users 2984 Apr 27 19:02 .bash_history -rw-r--r--. 1 smithj users 18 Aug 21 2019 .bash_logout -rw-r--r--. 1 smithj users 193 Aug 21 2019 .bash_profile If any local initialization files have a mode more permissive than "0740", this is a finding.
Fix: F-4600r917826_fix
Set the mode of the 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/.[^.]*
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020720
- Vuln IDs
-
- V-204477
- V-72035
- Rule IDs
-
- SV-204477r991589_rule
- SV-86659
Checks: C-4601r792827_chk
Verify that all 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 local interactive user initialization files in the user's home directory with the following commands: Note: The example will be for the smithj user, which has a home directory of "/home/smithj". # 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, this is a finding.
Fix: F-4601r88624_fix
Edit the local interactive user initialization files to change any PATH variable statements 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.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020730
- Vuln IDs
-
- V-204478
- V-72037
- Rule IDs
-
- SV-204478r991589_rule
- SV-86661
Checks: C-4602r88626_chk
Verify that local initialization files do not execute world-writable programs. Check the system for world-writable files with the following command: # find / -xdev -perm -002 -type f -exec ls -ld {} \; | more For all files listed, check for their presence in the local initialization files with the following commands: Note: The example will be for a system that is configured to create users' home directories in the "/home" directory. # grep <file> /home/*/.* If any local initialization files are found to reference world-writable files, this is a finding.
Fix: F-4602r88627_fix
Set the mode on files being executed by the local initialization files with the following command: # chmod 0755 <file>
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-020900
- Vuln IDs
-
- V-204479
- V-72039
- Rule IDs
-
- SV-204479r991589_rule
- SV-86663
Checks: C-4603r88629_chk
Verify that all system device files are correctly labeled to prevent unauthorized modification. List all device files on the system that are incorrectly labeled with the following commands: Note: Device files are normally found under "/dev", but applications may place device files in other directories and may necessitate a search of the entire system. #find /dev -context *:device_t:* \( -type c -o -type b \) -printf "%p %Z\n" #find /dev -context *:unlabeled_t:* \( -type c -o -type b \) -printf "%p %Z\n" Note: There are device files, such as "/dev/vmci", that are used when the operating system is a host virtual machine. They will not be owned by a user on the system and require the "device_t" label to operate. These device files are not a finding. If there is output from either of these commands, other than already noted, this is a finding.
Fix: F-4603r88630_fix
Run the following command to determine which package owns the device file: # rpm -qf <filename> The package can be reinstalled from a yum repository using the command: # sudo yum reinstall <packagename> Alternatively, the package can be reinstalled from trusted media using the command: # sudo rpm -Uvh <packagename>
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021000
- Vuln IDs
-
- V-204480
- V-72041
- Rule IDs
-
- SV-204480r991589_rule
- SV-86665
Checks: C-4604r622301_chk
Verify file systems that contain user home directories are mounted with the "nosuid" option. Find the file system(s) that contain the user home directories with the following command: 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. # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6}' /etc/passwd smithj 1001 /home/smithj thomasr 1002 /home/thomasr Check the file systems that are mounted at boot time with the following command: # more /etc/fstab UUID=a411dc99-f2a1-4c87-9e05-184977be8539 /home ext4 rw,relatime,discard,data=ordered,nosuid 0 2 If a file system found in "/etc/fstab" refers to the user home directory file system and it does not have the "nosuid" option set, this is a finding.
Fix: F-4604r88633_fix
Configure the "/etc/fstab" to use the "nosuid" option on file systems that contain user home directories.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021010
- Vuln IDs
-
- V-204481
- V-72043
- Rule IDs
-
- SV-204481r991589_rule
- SV-86667
Checks: C-4605r88635_chk
Verify file systems that are 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-4605r88636_fix
Configure the "/etc/fstab" to use the "nosuid" option on file systems that are associated with removable media.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021020
- Vuln IDs
-
- V-204482
- V-72045
- Rule IDs
-
- SV-204482r991589_rule
- SV-86669
Checks: C-4606r88638_chk
Verify file systems that are being NFS imported are configured 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. Verify the NFS is mounted with the "nosuid" option: # mount | grep nfs | grep nosuid If no results are returned, this is a finding.
Fix: F-4606r88639_fix
Configure the "/etc/fstab" to use the "nosuid" option on file systems that are being imported via NFS.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021021
- Vuln IDs
-
- V-204483
- V-73161
- Rule IDs
-
- SV-204483r991589_rule
- SV-87813
Checks: C-4607r88641_chk
Verify file systems that are being NFS imported are configured with the "noexec" option. Find the file system(s) that contain the directories being imported 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 imported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the NFS is mounted with the "noexec"option: # mount | grep nfs | grep noexec If no results are returned and use of NFS imported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Fix: F-4607r88642_fix
Configure the "/etc/fstab" to use the "noexec" option on file systems that are being imported via NFS.
- RMF Control
- CM-7
- Severity
- Low
- CCI
- CCI-001764
- Version
- RHEL-07-021024
- Vuln IDs
-
- V-204486
- V-81013
- Rule IDs
-
- SV-204486r958804_rule
- SV-95725
Checks: C-4610r462552_chk
Verify that the "nodev","nosuid", and "noexec" options are configured for /dev/shm: # cat /etc/fstab | grep /dev/shm tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0 If results are returned and the "nodev", "nosuid", or "noexec" options are missing, this is a finding. Verify "/dev/shm" is mounted with the "nodev", "nosuid", and "noexec" options: # mount | grep /dev/shm tmpfs on /dev/shm type tmpfs (rw,nodev,nosuid,noexec,seclabel) If /dev/shm is mounted without secure options "nodev", "nosuid", and "noexec", this is a finding.
Fix: F-4610r462553_fix
Configure the system so that /dev/shm is mounted with the "nodev", "nosuid", and "noexec" options by adding /modifying the /etc/fstab with the following line: tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021030
- Vuln IDs
-
- V-204487
- V-72047
- Rule IDs
-
- SV-204487r991589_rule
- SV-86671
Checks: C-36345r602633_chk
The following command will discover and print world-writable directories that are not group-owned by a system account, assuming only system accounts have a GID lower than 1000. Run it once for each local partition [PART]: # find [PART] -xdev -type d -perm -0002 -gid +999 -print If there is output, this is a finding.
Fix: F-36308r602634_fix
All directories in local partitions which are world-writable should be group-owned by root or another system account. If any world-writable directories are not group-owned by a system account, this should be investigated. Following this, the directories should be deleted or assigned to an appropriate group.
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-021040
- Vuln IDs
-
- V-204488
- V-72049
- Rule IDs
-
- SV-204488r991589_rule
- SV-86673
Checks: C-4612r858483_chk
Verify that the default umask for all local interactive users is "077". Identify the locations of all local interactive user home directories by looking at the "/etc/passwd" file. Check all local interactive user initialization files for interactive users with the following command: Note: The example is for a system that is configured to create users home directories in the "/home" directory. $ sudo grep -ir ^umask /home | grep -v '.bash_history' If any local interactive user initialization files are found to have a umask statement that has a value less restrictive than "077", this is a finding.
Fix: F-4612r88657_fix
Remove the umask statement from all local interactive user's initialization files. If the account is for an application, the requirement for a umask less restrictive than "077" can be documented with the Information System Security Officer, but the user agreement for access to the account must specify that the local interactive user must log on to their account first and then switch the user to the application account with the correct option to gain the account's environment variables.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021100
- Vuln IDs
-
- V-204489
- V-72051
- Rule IDs
-
- SV-204489r991589_rule
- SV-86675
Checks: C-4613r744107_chk
Verify that "rsyslog" is configured to log cron events. Check the configuration of "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files for the cron facility with the following command: Note: If another logging package is used, substitute the utility configuration file for "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files. # grep cron /etc/rsyslog.conf /etc/rsyslog.d/*.conf cron.* /var/log/cron If the command does not return a response, check for cron logging all facilities by inspecting the "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files. Look for the following entry: *.* /var/log/messages If "rsyslog" is not logging messages for the cron facility or all facilities, this is a finding.
Fix: F-4613r744108_fix
Configure "rsyslog" to log all cron messages by adding or updating the following line to "/etc/rsyslog.conf" or a configuration file in the /etc/rsyslog.d/ directory: cron.* /var/log/cron The rsyslog daemon must be restarted for the changes to take effect: $ sudo systemctl restart rsyslog.service
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021110
- Vuln IDs
-
- V-204490
- V-72053
- Rule IDs
-
- SV-204490r991589_rule
- SV-86677
Checks: C-4614r88662_chk
Verify that the "cron.allow" file is owned by root. Check the owner of the "cron.allow" file with the following command: # ls -al /etc/cron.allow -rw------- 1 root root 6 Mar 5 2011 /etc/cron.allow If the "cron.allow" file exists and has an owner other than root, this is a finding.
Fix: F-4614r88663_fix
Set the owner on the "/etc/cron.allow" file to root with the following command: # chown root /etc/cron.allow
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021120
- Vuln IDs
-
- V-204491
- V-72055
- Rule IDs
-
- SV-204491r991589_rule
- SV-86679
Checks: C-4615r88665_chk
Verify that the "cron.allow" file is group-owned by root. Check the group owner of the "cron.allow" file with the following command: # ls -al /etc/cron.allow -rw------- 1 root root 6 Mar 5 2011 /etc/cron.allow If the "cron.allow" file exists and has a group owner other than root, this is a finding.
Fix: F-4615r88666_fix
Set the group owner on the "/etc/cron.allow" file to root with the following command: # chgrp root /etc/cron.allow
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021300
- Vuln IDs
-
- V-204492
- V-72057
- Rule IDs
-
- SV-204492r991589_rule
- SV-86681
Checks: C-4616r88668_chk
Verify that kernel core dumps are disabled unless needed. Check the status of the "kdump" service with the following command: # systemctl status kdump.service kdump.service - Crash recovery kernel arming Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled) Active: active (exited) since Wed 2015-08-26 13:08:09 EDT; 43min ago Main PID: 1130 (code=exited, status=0/SUCCESS) kernel arming. 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-4616r88669_fix
If 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.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021310
- Vuln IDs
-
- V-204493
- V-72059
- Rule IDs
-
- SV-204493r991589_rule
- SV-86683
Checks: C-4617r622303_chk
Verify that a separate file system/partition has been created for non-privileged local interactive user home directories. Check the home directory assignment for all non-privileged users (those with a UID of 1000 or greater) on the system with the following command: # awk -F: '($3>=1000)&&($7 !~ /nologin/){print $1, $3, $6, $7}' /etc/passwd adamsj 1000 /home/adamsj /bin/bash jacksonm 1001 /home/jacksonm /bin/bash smithj 1002 /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 users' 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-4617r88672_fix
Migrate the "/home" directory onto a separate file system/partition.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021320
- Vuln IDs
-
- V-204494
- V-72061
- Rule IDs
-
- SV-204494r991589_rule
- SV-86685
Checks: C-4618r88674_chk
Verify that a separate file system/partition has been created 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-4618r88675_fix
Migrate the "/var" path onto a separate file system.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021330
- Vuln IDs
-
- V-204495
- V-72063
- Rule IDs
-
- SV-204495r991589_rule
- SV-86687
Checks: C-4619r88677_chk
Determine if the operating system is configured to have the "/var/log/audit" path is on a separate file system. # grep /var/log/audit /etc/fstab If no result is returned, or the operating system is not configured to have "/var/log/audit" on a separate file system, this is a finding. Verify that "/var/log/audit" is mounted on a separate file system: # mount | grep "/var/log/audit" If no result is returned, or "/var/log/audit" is not on a separate file system, this is a finding.
Fix: F-4619r88678_fix
Migrate the system audit data path onto a separate file system.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021340
- Vuln IDs
-
- V-204496
- V-72065
- Rule IDs
-
- SV-204496r991589_rule
- SV-86689
Checks: C-36346r602636_chk
Verify that a separate file system/partition has been created for "/tmp". Check that a file system/partition has been created for "/tmp" with the following command: # systemctl is-enabled tmp.mount enabled If the "tmp.mount" service is not enabled, check to see if "/tmp" is defined in the fstab with a device and mount point: # grep -i /tmp /etc/fstab UUID=a411dc99-f2a1-4c87-9e05-184977be8539 /tmp ext4 rw,relatime,discard,data=ordered,nosuid,noexec, 0 0 If "tmp.mount" service is not enabled or the "/tmp" directory is not defined in the fstab with a device and mount point, this is a finding.
Fix: F-36309r602637_fix
Start the "tmp.mount" service with the following command: # systemctl enable tmp.mount OR Edit the "/etc/fstab" file and ensure the "/tmp" directory is defined in the fstab with a device and mount point.
- RMF Control
- AC-17
- Severity
- High
- CCI
- CCI-000068
- Version
- RHEL-07-021350
- Vuln IDs
-
- V-204497
- V-72067
- Rule IDs
-
- SV-204497r958408_rule
- SV-86691
Checks: C-36347r602639_chk
Verify the operating system implements DoD-approved encryption to protect the confidentiality of remote access sessions. Check to see if the "dracut-fips" package is installed with the following command: # yum list installed dracut-fips dracut-fips-033-360.el7_2.x86_64.rpm If a "dracut-fips" package is installed, check to see if the kernel command line is configured to use FIPS mode with the following command: Note: GRUB 2 reads its configuration from the "/boot/grub2/grub.cfg" file on traditional BIOS-based machines and from the "/boot/efi/EFI/redhat/grub.cfg" file on UEFI machines. # grep fips /boot/grub2/grub.cfg /vmlinuz-3.8.0-0.40.el7.x86_64 root=/dev/mapper/rhel-root ro rd.md=0 rd.dm=0 rd.lvm.lv=rhel/swap crashkernel=auto rd.luks=0 vconsole.keymap=us rd.lvm.lv=rhel/root rhgb fips=1 quiet If the kernel command line is configured to use FIPS mode, check to see if the system is in FIPS mode with the following command: # cat /proc/sys/crypto/fips_enabled 1 If a "dracut-fips" package is not installed, the kernel command line does not have a fips entry, or the system has a value of "0" for "fips_enabled" in "/proc/sys/crypto", this is a finding. Verify the file /etc/system-fips exists. # ls -l /etc/system-fips If this file does not exist, this is a finding.
Fix: F-36310r602640_fix
Configure the operating system to implement DoD-approved encryption by installing the dracut-fips package. To enable strict FIPS compliance, the fips=1 kernel option needs to be added to the kernel command line during system installation so key generation is done with FIPS-approved algorithms and continuous monitoring tests in place. Configure the operating system to implement DoD-approved encryption by following the steps below: The fips=1 kernel option needs to be added to the kernel command line during system installation so that key generation is done with FIPS-approved algorithms and continuous monitoring tests in place. Users should also ensure that the system has plenty of entropy during the installation process by moving the mouse around, or if no mouse is available, ensuring that many keystrokes are typed. The recommended amount of keystrokes is 256 and more. Less than 256 keystrokes may generate a non-unique key. Install the dracut-fips package with the following command: # yum install dracut-fips Recreate the "initramfs" file with the following command: Note: This command will overwrite the existing "initramfs" file. # dracut -f Modify the kernel command line of the current kernel in the "grub.cfg" file by adding the following option to the GRUB_CMDLINE_LINUX key in the "/etc/default/grub" file and then rebuild the "grub.cfg" file: fips=1 Changes to "/etc/default/grub" require rebuilding the "grub.cfg" file as follows: On BIOS-based machines, use the following command: # grub2-mkconfig -o /boot/grub2/grub.cfg On UEFI-based machines, use the following command: # grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg If /boot or /boot/efi reside on separate partitions, the kernel parameter boot=<partition of /boot or /boot/efi> must be added to the kernel command line. You can identify a partition by running the df /boot or df /boot/efi command: # df /boot Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 495844 53780 416464 12% /boot To ensure the "boot=" configuration option will work even if device naming changes occur between boots, identify the universally unique identifier (UUID) of the partition with the following command: # blkid /dev/sda1 /dev/sda1: UUID="05c000f1-a213-759e-c7a2-f11b7424c797" TYPE="ext4" For the example above, append the following string to the kernel command line: boot=UUID=05c000f1-a213-759e-c7a2-f11b7424c797 If the file /etc/system-fips does not exists, recreate it: # touch /etc/ system-fips Reboot the system for the changes to take effect.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021600
- Vuln IDs
-
- V-204498
- V-72069
- Rule IDs
-
- SV-204498r991589_rule
- SV-86693
Checks: C-4622r880855_chk
Verify the file integrity tool is configured to verify ACLs. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf 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 is below: 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 uncommented 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-4622r88687_fix
Configure the file integrity tool to check file and directory ACLs. If AIDE is installed, ensure the "acl" rule is present on all uncommented file and directory selection lists.
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-021610
- Vuln IDs
-
- V-204499
- V-72071
- Rule IDs
-
- SV-204499r991589_rule
- SV-86695
Checks: C-4623r880857_chk
Verify the file integrity tool is configured to verify extended attributes. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf 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 uncommented 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-4623r88690_fix
Configure the file integrity tool to check file and directory extended attributes. If AIDE is installed, ensure the "xattrs" rule is present on all uncommented file and directory selection lists.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021620
- Vuln IDs
-
- V-204500
- V-72073
- Rule IDs
-
- SV-204500r991589_rule
- SV-86697
Checks: C-4624r880859_chk
Verify the file integrity tool is configured to use FIPS 140-2-approved cryptographic hashes for validating file contents and directories. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "sha512" rule has been added to the rule list being applied to the files and directories selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications. An example rule that includes the "sha512" 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 "sha512" rule is not being used on all uncommented selection lines in the "/etc/aide.conf" file, or another file integrity tool is not using FIPS 140-2-approved cryptographic hashes for validating file contents and directories, this is a finding.
Fix: F-4624r792830_fix
Configure the file integrity tool to use FIPS 140-2 cryptographic hashes for validating file and directory contents. If AIDE is installed, ensure the "sha512" rule is present on all uncommented file and directory selection lists. Exclude any log files, or files expected to change frequently, to reduce unnecessary notifications.
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-021700
- Vuln IDs
-
- V-204501
- V-72075
- Rule IDs
-
- SV-204501r958796_rule
- SV-86699
Checks: C-4625r928575_chk
Verify the system is not configured to use a boot loader on removable media. Note: GRUB 2 reads its configuration from the "/boot/grub2/grub.cfg" file on traditional BIOS-based machines and from the "/boot/efi/EFI/redhat/grub.cfg" file on UEFI machines. Check for the existence of alternate boot loader configuration files with the following command: # find / -name grub.cfg /boot/efi/EFI/redhat/grub.cfg If a "grub.cfg" is found in any subdirectories other than "/boot/grub2/" and "/boot/efi/EFI/redhat/", ask the system administrator (SA) if there is documentation signed by the ISSO to approve the use of removable media as a boot loader. List the number of menu entries defined in the grub configuration file with the following command (the number will vary between systems): # grep -cw menuentry /boot/efi/EFI/redhat/grub.cfg 4 Check that the grub configuration file has the "set root" command for each menu entry with the following command ("set root" defines the disk and partition or directory where the kernel and GRUB 2 modules are stored): # grep 'set root' /boot/efi/EFI/redhat/grub.cfg set root='hd0,gpt2' set root='hd0,gpt2' set root='hd0,gpt2' set root='hd0,gpt2' If the system is using an alternate boot loader on removable media, and documentation does not exist approving the alternate configuration, this is a finding.
Fix: F-4625r88696_fix
Remove alternate methods of booting the system from removable media or document the configuration to boot from removable media with the ISSO.
- RMF Control
- CM-7
- Severity
- High
- CCI
- CCI-000381
- Version
- RHEL-07-021710
- Vuln IDs
-
- V-204502
- V-72077
- Rule IDs
-
- SV-204502r958478_rule
- SV-86701
Checks: C-4626r88698_chk
Verify the operating system is configured to disable non-essential capabilities. The most secure way of ensuring a non-essential capability is disabled is to not have the capability installed. The telnet service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using this service, the privileged user password could be compromised. Check to see if the telnet-server package is installed with the following command: # yum list installed telnet-server If the telnet-server package is installed, this is a finding.
Fix: F-4626r88699_fix
Configure the operating system to disable non-essential capabilities by removing the telnet-server package from the system with the following command: # yum remove telnet-server
- RMF Control
- AU-2
- Severity
- Medium
- CCI
- CCI-000126
- Version
- RHEL-07-030000
- Vuln IDs
-
- V-204503
- V-72079
- Rule IDs
-
- SV-204503r958414_rule
- SV-86703
Checks: C-36348r602642_chk
Verify the operating system produces audit records containing information to establish when (date and time) the events occurred. Check to see if auditing is active by issuing the following command: # systemctl is-active auditd.service active If the "auditd" status is not active, this is a finding.
Fix: F-36311r602643_fix
Configure the operating system to produce audit records containing information to establish when (date and time) the events occurred. Enable the auditd service with the following command: # systemctl start auditd.service
- RMF Control
- AU-5
- Severity
- Medium
- CCI
- CCI-000139
- Version
- RHEL-07-030010
- Vuln IDs
-
- V-204504
- V-72081
- Rule IDs
-
- SV-204504r958424_rule
- SV-86705
Checks: C-4628r880759_chk
Confirm the audit configuration regarding how auditing processing failures are handled. Check to see what level "auditctl" is set to with following command: # auditctl -s | grep -i "fail" failure 2 Note: If the value of "failure" is set to "2", the system is configured to panic (shut down) in the event of an auditing failure. If the value of "failure" is set to "1", the system will not shut down and instead will record the audit failure in the kernel log. If the system is configured as per requirement RHEL-07-031000, the kernel log will be sent to a log aggregation server and generate an alert. If the "failure" setting is set to any value other than "1" or "2", this is a finding. If the "failure" setting is not set, this should be upgraded to a CAT I finding. If the "failure" setting is set to "1" but the availability concern is not documented or there is no monitoring of the kernel log, this should be downgraded to a CAT III finding.
Fix: F-4628r880760_fix
Configure the operating system to shut down in the event of an audit processing failure. Add or correct the option to shut down the operating system with the following command: # auditctl -f 2 Edit the "/etc/audit/rules.d/audit.rules" file and add the following line: -f 2 If availability has been determined to be more important, and this decision is documented with the ISSO, configure the operating system to notify system administration staff and ISSO staff in the event of an audit processing failure with the following command: # auditctl -f 1 Edit the "/etc/audit/rules.d/audit.rules" file and add the following line: -f 1 Kernel log monitoring must also be configured to properly alert designated staff. The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030201
- Vuln IDs
-
- V-204506
- V-81017
- Rule IDs
-
- SV-204506r958754_rule
- SV-95729
Checks: C-4630r462469_chk
Verify the "au-remote" plugin is configured to always off-load audit logs using the audisp-remote daemon: # cat /etc/audisp/plugins.d/au-remote.conf | grep -v "^#" active = yes direction = out path = /sbin/audisp-remote type = always format = string If "active" is not set to "yes", "direction" is not set to "out", "path" is not set to "/sbin/audisp-remote", "type" is not set to "always", or any of the lines are commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, this is a finding.
Fix: F-4630r858479_fix
Edit the /etc/audisp/plugins.d/au-remote.conf file and add or update the following values: active = yes direction = out path = /sbin/audisp-remote type = always The audit daemon must be restarted for changes to take effect: # service auditd restart
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030210
- Vuln IDs
-
- V-204507
- V-81019
- Rule IDs
-
- SV-204507r958754_rule
- SV-95731
Checks: C-36349r602645_chk
Verify the audisp daemon is configured to take an appropriate action when the internal queue is full: # grep "overflow_action" /etc/audisp/audispd.conf overflow_action = syslog If the "overflow_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate what action that system takes when the internal queue is full. If there is no evidence the system is configured to off-load audit logs to a different system or storage media or, if the configuration does not take appropriate action when the internal queue is full, this is a finding.
Fix: F-36312r602646_fix
Edit the /etc/audisp/audispd.conf file and add or update the "overflow_action" option: overflow_action = syslog The audit daemon must be restarted for changes to take effect: # service auditd restart
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030211
- Vuln IDs
-
- V-204508
- V-81021
- Rule IDs
-
- SV-204508r958754_rule
- SV-95733
Checks: C-36350r602648_chk
Verify the audisp daemon is configured to label all off-loaded audit logs: # grep "name_format" /etc/audisp/audispd.conf name_format = hostname If the "name_format" option is not "hostname", "fqd", or "numeric", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate if the logs are labeled appropriately. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not appropriately label logs before they are off-loaded, this is a finding.
Fix: F-36313r602649_fix
Edit the /etc/audisp/audispd.conf file and add or update the "name_format" option: name_format = hostname The audit daemon must be restarted for changes to take effect: # service auditd restart
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030300
- Vuln IDs
-
- V-204509
- V-72083
- Rule IDs
-
- SV-204509r958754_rule
- SV-86707
Checks: C-4633r88719_chk
Verify the operating system off-loads audit records onto a different system or media from the system being audited. To determine the remote server that the records are being sent to, use the following command: # grep -i remote_server /etc/audisp/audisp-remote.conf remote_server = 10.0.21.1 If a remote server is not configured, or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. If there is no evidence that the audit logs are being off-loaded to another system or media, this is a finding.
Fix: F-4633r88720_fix
Configure the operating system to off-load audit records onto a different system or media from the system being audited. Set the remote server option in "/etc/audisp/audisp-remote.conf" with the IP address of the log aggregation server.
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030310
- Vuln IDs
-
- V-204510
- V-72085
- Rule IDs
-
- SV-204510r958754_rule
- SV-86709
Checks: C-4634r88722_chk
Verify the operating system encrypts audit records off-loaded onto a different system or media from the system being audited. To determine if the transfer is encrypted, use the following command: # grep -i enable_krb5 /etc/audisp/audisp-remote.conf enable_krb5 = yes If the value of the "enable_krb5" option is not set to "yes" or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. If there is no evidence that the transfer of the audit logs being off-loaded to another system or media is encrypted, this is a finding.
Fix: F-4634r88723_fix
Configure the operating system to encrypt the transfer of off-loaded audit records onto a different system or media from the system being audited. Uncomment the "enable_krb5" option in "/etc/audisp/audisp-remote.conf" and set it with the following line: enable_krb5 = yes
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030320
- Vuln IDs
-
- V-204511
- V-72087
- Rule IDs
-
- SV-204511r958754_rule
- SV-86711
Checks: C-36351r602651_chk
Verify the action the operating system takes if the disk the audit records are written to becomes full. To determine the action that takes place if the disk is full on the remote server, use the following command: # grep -i disk_full_action /etc/audisp/audisp-remote.conf disk_full_action = single If the value of the "disk_full_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate the action taken when the disk is full on the remote server. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not take appropriate action when the disk is full on the remote server, this is a finding.
Fix: F-36314r602652_fix
Configure the action the operating system takes if the disk the audit records are written to becomes full. Uncomment or edit the "disk_full_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt", such as the following line: disk_full_action = single
- RMF Control
- AU-4
- Severity
- Medium
- CCI
- CCI-001851
- Version
- RHEL-07-030321
- Vuln IDs
-
- V-204512
- V-73163
- Rule IDs
-
- SV-204512r958754_rule
- SV-87815
Checks: C-36352r602654_chk
Verify the action the operating system takes if there is an error sending audit records to a remote system. Check the action that takes place if there is an error sending audit records to a remote system with the following command: # grep -i network_failure_action /etc/audisp/audisp-remote.conf network_failure_action = syslog If the value of the "network_failure_action" option is not "syslog", "single", or "halt", or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or storage media, and to indicate the action taken if there is an error sending audit records to the remote system. If there is no evidence that the system is configured to off-load audit logs to a different system or storage media, or if the configuration does not take appropriate action if there is an error sending audit records to the remote system, this is a finding.
Fix: F-36315r602655_fix
Configure the action the operating system takes if there is an error sending audit records to a remote system. Uncomment the "network_failure_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt". network_failure_action = syslog
- RMF Control
- AU-5
- Severity
- Medium
- CCI
- CCI-001855
- Version
- RHEL-07-030330
- Vuln IDs
-
- V-204513
- V-72089
- Rule IDs
-
- SV-204513r971542_rule
- SV-86713
Checks: C-4637r744110_chk
Verify the operating system initiates an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. Check the system configuration to determine the partition the audit records are being written to with the following command: $ sudo grep -iw log_file /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Determine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached: $ sudo grep -iw space_left /etc/audit/auditd.conf space_left = 25% 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-4637r744111_fix
Configure the operating system to initiate an action to notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. Set the value of the "space_left" keyword in "/etc/audit/auditd.conf" to 25 percent of the partition size. space_left = 25% Reload the auditd daemon to apply changes made to the "/etc/audit/auditd.conf" file.
- RMF Control
- AU-5
- Severity
- Medium
- CCI
- CCI-001855
- Version
- RHEL-07-030340
- Vuln IDs
-
- V-204514
- V-72091
- Rule IDs
-
- SV-204514r971542_rule
- SV-86715
Checks: C-4638r88734_chk
Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity. Check what action the operating system takes when the threshold for the repository maximum audit record storage capacity is reached with the following command: # grep -i space_left_action /etc/audit/auditd.conf space_left_action = email If the value of the "space_left_action" keyword is not set to "email", this is a finding.
Fix: F-4638r88735_fix
Configure the operating system to immediately notify the SA and ISSO (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached. Uncomment or edit the "space_left_action" keyword in "/etc/audit/auditd.conf" and set it to "email". space_left_action = email
- RMF Control
- AU-5
- Severity
- Medium
- CCI
- CCI-001855
- Version
- RHEL-07-030350
- Vuln IDs
-
- V-204515
- V-72093
- Rule IDs
-
- SV-204515r971542_rule
- SV-86717
Checks: C-4639r88737_chk
Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the threshold for the repository maximum audit record storage capacity is reached. Check what account the operating system emails when the threshold for the repository maximum audit record storage capacity is reached with the following command: # grep -i action_mail_acct /etc/audit/auditd.conf action_mail_acct = root If the value of the "action_mail_acct" keyword is not set to "root" and other accounts for security personnel, this is a finding.
Fix: F-4639r88738_fix
Configure the operating system to immediately notify the SA and ISSO (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached. Uncomment or edit the "action_mail_acct" keyword in "/etc/audit/auditd.conf" and set it to root and any other accounts associated with security personnel. action_mail_acct = root
- RMF Control
- AC-6
- Severity
- Medium
- CCI
- CCI-002234
- Version
- RHEL-07-030360
- Vuln IDs
-
- V-204516
- V-72095
- Rule IDs
-
- SV-204516r958732_rule
- SV-86719
Checks: C-4640r88740_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-4640r88741_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.
- RMF Control
- AU-2
- Severity
- Medium
- CCI
- CCI-000126
- Version
- RHEL-07-030370
- Vuln IDs
-
- V-204517
- V-72097
- Rule IDs
-
- SV-204517r958446_rule
- SV-86721
Checks: C-4641r809569_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chown", "fchown", "fchownat", and "lchown" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep chown /etc/audit/audit.rules -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chown", "fchown", "fchownat", and "lchown" syscalls, this is a finding.
Fix: F-4641r809192_fix
Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030410
- Vuln IDs
-
- V-204521
- V-72105
- Rule IDs
-
- SV-204521r991570_rule
- SV-86729
Checks: C-4645r809571_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following command: # grep chmod /etc/audit/audit.rules -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -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-4645r809771_fix
Configure the operating system to generate audit records upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" syscalls. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030440
- Vuln IDs
-
- V-204524
- V-72111
- Rule IDs
-
- SV-204524r991570_rule
- SV-86735
Checks: C-4648r809773_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep xattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -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-4648r809774_fix
Configure the operating system to generate audit records upon successful/unsuccessful attempts to use the "setxattr", "fsetxattr", "lsetxattr", "removexattr", "fremovexattr", and "lremovexattr" syscalls. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S setxattr,fsetxattr,lsetxattr,removexattr,fremovexattr,lremovexattr -F auid>=1000 -F auid!=unset -k perm_mod The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030510
- Vuln IDs
-
- V-204531
- V-72125
- Rule IDs
-
- SV-204531r958446_rule
- SV-86749
Checks: C-4655r853915_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # 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!=unset -k 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!=unset -k 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!=unset -k 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!=unset -k 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-4655r853916_fix
Configure the operating system to generate audit records upon successful/unsuccessful attempts to use the "creat", "open", "openat", "open_by_handle_at", "truncate", and "ftruncate" syscalls. Add or update the following rules in "/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!=unset -k 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!=unset -k 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!=unset -k 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!=unset -k access The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030560
- Vuln IDs
-
- V-204536
- V-72135
- Rule IDs
-
- SV-204536r958846_rule
- SV-86759
Checks: C-4660r861012_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "semanage" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/semanage" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4660r861013_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "semanage" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030570
- Vuln IDs
-
- V-204537
- V-72137
- Rule IDs
-
- SV-204537r958846_rule
- SV-86761
Checks: C-4661r861015_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "setsebool" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/setsebool" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4661r861016_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "setsebool" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030580
- Vuln IDs
-
- V-204538
- V-72139
- Rule IDs
-
- SV-204538r958846_rule
- SV-86763
Checks: C-4662r861018_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chcon" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/chcon" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4662r861019_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chcon" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030590
- Vuln IDs
-
- V-204539
- V-72141
- Rule IDs
-
- SV-204539r958846_rule
- SV-86765
Checks: C-4663r861021_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "setfiles" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/setfiles" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4663r861022_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "setfiles" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-2
- Severity
- Medium
- CCI
- CCI-000126
- Version
- RHEL-07-030610
- Vuln IDs
-
- V-204540
- V-72145
- Rule IDs
-
- SV-204540r958846_rule
- SV-86769
Checks: C-4664r88812_chk
Verify the operating system generates audit records when unsuccessful account access events occur. Check the file system rule in "/etc/audit/audit.rules" with the following commands: # grep -i /var/run/faillock /etc/audit/audit.rules -w /var/run/faillock -p wa -k logins If the command does not return any output, this is a finding.
Fix: F-4664r88813_fix
Configure the operating system to generate audit records when unsuccessful account access events occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -w /var/run/faillock -p wa -k logins The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-2
- Severity
- Medium
- CCI
- CCI-000126
- Version
- RHEL-07-030620
- Vuln IDs
-
- V-204541
- V-72147
- Rule IDs
-
- SV-204541r958846_rule
- SV-86771
Checks: C-4665r88815_chk
Verify the operating system generates audit records when successful account access events occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep -i /var/log/lastlog /etc/audit/audit.rules -w /var/log/lastlog -p wa -k logins If the command does not return any output, this is a finding.
Fix: F-4665r88816_fix
Configure the operating system to generate audit records when successful account access events occur. Add or update the following rule in "/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.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030630
- Vuln IDs
-
- V-204542
- V-72149
- Rule IDs
-
- SV-204542r958422_rule
- SV-86773
Checks: C-4666r861024_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "passwd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/passwd" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.
Fix: F-4666r861025_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "passwd" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030640
- Vuln IDs
-
- V-204543
- V-72151
- Rule IDs
-
- SV-204543r958422_rule
- SV-86775
Checks: C-4667r861027_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/unix_chkpwd" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.
Fix: F-4667r861028_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030650
- Vuln IDs
-
- V-204544
- V-72153
- Rule IDs
-
- SV-204544r958422_rule
- SV-86777
Checks: C-4668r861030_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "gpasswd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/gpasswd" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.
Fix: F-4668r861031_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "gpasswd" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030660
- Vuln IDs
-
- V-204545
- V-72155
- Rule IDs
-
- SV-204545r958422_rule
- SV-86779
Checks: C-4669r861033_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chage" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/bin/chage" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.
Fix: F-4669r861034_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chage" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030670
- Vuln IDs
-
- V-204546
- V-72157
- Rule IDs
-
- SV-204546r958422_rule
- SV-86781
Checks: C-4670r861036_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "userhelper" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/userhelper" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd If the command does not return any output, this is a finding.
Fix: F-4670r861037_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "userhelper" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid>=1000 -F auid!=unset -k privileged-passwd The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000130
- Version
- RHEL-07-030680
- Vuln IDs
-
- V-204547
- V-72159
- Rule IDs
-
- SV-204547r958412_rule
- SV-86783
Checks: C-4671r861039_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "su" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/su" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4671r861040_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "su" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000130
- Version
- RHEL-07-030690
- Vuln IDs
-
- V-204548
- V-72161
- Rule IDs
-
- SV-204548r958412_rule
- SV-86785
Checks: C-4672r861042_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "sudo" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/sudo" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4672r861043_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "sudo" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000130
- Version
- RHEL-07-030700
- Vuln IDs
-
- V-204549
- V-72163
- Rule IDs
-
- SV-204549r958412_rule
- SV-86787
Checks: C-4673r88839_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory. Check for modification of the following files being audited by performing the following commands to check the file system rules in "/etc/audit/audit.rules": # grep -i "/etc/sudoers" /etc/audit/audit.rules -w /etc/sudoers -p wa -k privileged-actions # grep -i "/etc/sudoers.d/" /etc/audit/audit.rules -w /etc/sudoers.d/ -p wa -k privileged-actions If the commands do not return output that match the examples, this is a finding.
Fix: F-4673r88840_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to access the "/etc/sudoers" file and files in the "/etc/sudoers.d/" directory. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -w /etc/sudoers -p wa -k privileged-actions -w /etc/sudoers.d/ -p wa -k privileged-actions The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000130
- Version
- RHEL-07-030710
- Vuln IDs
-
- V-204550
- V-72165
- Rule IDs
-
- SV-204550r958412_rule
- SV-86789
Checks: C-4674r861045_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "newgrp" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/newgrp" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4674r861046_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "newgrp" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000130
- Version
- RHEL-07-030720
- Vuln IDs
-
- V-204551
- V-72167
- Rule IDs
-
- SV-204551r958412_rule
- SV-86791
Checks: C-4675r861048_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chsh" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/chsh" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change If the command does not return any output, this is a finding.
Fix: F-4675r861049_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chsh" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030740
- Vuln IDs
-
- V-204552
- V-72171
- Rule IDs
-
- SV-204552r958422_rule
- SV-86795
Checks: C-4676r861051_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command and syscall occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "mount" /etc/audit/audit.rules -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount -a always,exit -F path=/usr/bin/mount -F perm=x -F auid>=1000 -F auid!=unset -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-4676r861052_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "mount" command and syscall occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k privileged-mount -a always,exit -F path=/usr/bin/mount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030750
- Vuln IDs
-
- V-204553
- V-72173
- Rule IDs
-
- SV-204553r958422_rule
- SV-86797
Checks: C-4677r861054_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "umount" command occur. Check that the following system call is being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/umount" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount If the command does not return any output, this is a finding.
Fix: F-4677r861055_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "umount" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030760
- Vuln IDs
-
- V-204554
- V-72175
- Rule IDs
-
- SV-204554r958422_rule
- SV-86799
Checks: C-4678r861057_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "postdrop" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/sbin/postdrop" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix If the command does not return any output, this is a finding.
Fix: F-4678r861058_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "postdrop" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030770
- Vuln IDs
-
- V-204555
- V-72177
- Rule IDs
-
- SV-204555r958422_rule
- SV-86801
Checks: C-4679r861060_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "postqueue" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/sbin/postqueue" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix If the command does not return any output, this is a finding.
Fix: F-4679r861061_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "postqueue" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid>=1000 -F auid!=unset -k privileged-postfix The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030780
- Vuln IDs
-
- V-204556
- V-72179
- Rule IDs
-
- SV-204556r958422_rule
- SV-86803
Checks: C-4680r861063_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "ssh-keysign" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/libexec/openssh/ssh-keysign" /etc/audit/audit.rules -a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=unset -k privileged-ssh If the command does not return any output, this is a finding.
Fix: F-4680r861064_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "ssh-keysign" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=unset -k privileged-ssh The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-3
- Severity
- Medium
- CCI
- CCI-000135
- Version
- RHEL-07-030800
- Vuln IDs
-
- V-204557
- V-72183
- Rule IDs
-
- SV-204557r958422_rule
- SV-86807
Checks: C-4681r861066_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "crontab" command occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo grep -w "/usr/bin/crontab" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=unset -k privileged-cron If the command does not return any output, this is a finding.
Fix: F-4681r861067_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "crontab" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=unset -k privileged-cron The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030810
- Vuln IDs
-
- V-204558
- V-72185
- Rule IDs
-
- SV-204558r991579_rule
- SV-86809
Checks: C-4682r833164_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "pam_timestamp_check" command occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "/usr/sbin/pam_timestamp_check" /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=unset -k privileged-pam If the command does not return any output, this is a finding.
Fix: F-4682r833165_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "pam_timestamp_check" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=unset -k privileged-pam The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030819
- Vuln IDs
-
- V-204559
- V-78999
- Rule IDs
-
- SV-204559r991580_rule
- SV-93705
Checks: C-4683r833167_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "create_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "create_module" /etc/audit/audit.rules -a always,exit -F arch=b32 -S create_module -F auid>=1000 -F auid!=unset -k module-change -a always,exit -F arch=b64 -S create_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "create_module" syscall, this is a finding.
Fix: F-4683r833168_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "create_module" syscall occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S create_module -F auid>=1000 -F auid!=unset -k module-change -a always,exit -F arch=b64 -S create_module -F auid>=1000 -F auid!=unset -k module-change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030820
- Vuln IDs
-
- V-204560
- V-72187
- Rule IDs
-
- SV-204560r991580_rule
- SV-86811
Checks: C-4684r833170_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "init_module" and "finit_module" syscalls. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep init_module /etc/audit/audit.rules -a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange -a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange 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-4684r833171_fix
Configure the operating system to generate audit records upon successful/unsuccessful attempts to use the "init_module" and "finit_module" syscalls. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange -a always,exit -F arch=b64 -S init_module,finit_module -F auid>=1000 -F auid!=unset -k modulechange The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030830
- Vuln IDs
-
- V-204562
- V-72189
- Rule IDs
-
- SV-204562r991580_rule
- SV-86813
Checks: C-4686r833173_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep -w "delete_module" /etc/audit/audit.rules -a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change -a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change If both the "b32" and "b64" audit rules are not defined for the "delete_module" syscall, this is a finding.
Fix: F-4686r833174_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change -a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030840
- Vuln IDs
-
- V-204563
- V-72191
- Rule IDs
-
- SV-204563r991580_rule
- SV-86815
Checks: C-4687r858496_chk
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "kmod" command occur. Check the auditing rules in "/etc/audit/audit.rules" with the following command: $ sudo grep "/usr/bin/kmod" /etc/audit/audit.rules -a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=unset -k modules If the command does not return any output, this is a finding.
Fix: F-4687r858497_fix
Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "kmod" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=unset -k modules The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-000018
- Version
- RHEL-07-030870
- Vuln IDs
-
- V-204564
- V-72197
- Rule IDs
-
- SV-204564r958368_rule
- SV-86821
Checks: C-4688r88884_chk
Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/passwd /etc/audit/audit.rules -w /etc/passwd -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.
Fix: F-4688r88885_fix
Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd". Add or update the following rule "/etc/audit/rules.d/audit.rules": -w /etc/passwd -p wa -k identity The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-000018
- Version
- RHEL-07-030871
- Vuln IDs
-
- V-204565
- V-73165
- Rule IDs
-
- SV-204565r958368_rule
- SV-87817
Checks: C-4689r88887_chk
Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/group /etc/audit/audit.rules -w /etc/group -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.
Fix: F-4689r88888_fix
Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group". Add or update the following rule in "/etc/audit/rules.d/audit.rules": -w /etc/group -p wa -k identity The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-000018
- Version
- RHEL-07-030872
- Vuln IDs
-
- V-204566
- V-73167
- Rule IDs
-
- SV-204566r958368_rule
- SV-87819
Checks: C-4690r88890_chk
Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/gshadow". Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/gshadow /etc/audit/audit.rules -w /etc/gshadow -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.
Fix: F-4690r88891_fix
Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/gshadow". Add or update the following rule in "/etc/audit/rules.d/audit.rules": -w /etc/gshadow -p wa -k identity The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-000018
- Version
- RHEL-07-030873
- Vuln IDs
-
- V-204567
- V-73171
- Rule IDs
-
- SV-204567r958368_rule
- SV-87823
Checks: C-4691r88893_chk
Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow. Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/shadow /etc/audit/audit.rules -w /etc/shadow -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.
Fix: F-4691r88894_fix
Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow. Add or update the following file system rule in "/etc/audit/rules.d/audit.rules": -w /etc/shadow -p wa -k identity The audit daemon must be restarted for the changes to take effect.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-000018
- Version
- RHEL-07-030874
- Vuln IDs
-
- V-204568
- V-73173
- Rule IDs
-
- SV-204568r958368_rule
- SV-87825
Checks: C-4692r744113_chk
Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/security/opasswd. Check the auditing rules in "/etc/audit/audit.rules" with the following command: # grep /etc/security/opasswd /etc/audit/audit.rules -w /etc/security/opasswd -p wa -k identity If the command does not return a line, or the line is commented out, this is a finding.
Fix: F-4692r744114_fix
Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/security/opasswd. Add or update the following file system rule in "/etc/audit/rules.d/audit.rules": -w /etc/security/opasswd -p wa -k identity The audit daemon must be restarted for the changes to take effect: # systemctl restart auditd
- RMF Control
- AU-12
- Severity
- Medium
- CCI
- CCI-000172
- Version
- RHEL-07-030910
- Vuln IDs
-
- V-204572
- V-72205
- Rule IDs
-
- SV-204572r991575_rule
- SV-86829
Checks: C-4696r853983_chk
Verify the operating system generates audit records upon successful/unsuccessful attempts to use the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep 'unlink\|rename\|rmdir' /etc/audit/audit.rules -a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete -a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete If both the "b32" and "b64" audit rules are not defined for the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls, this is a finding.
Fix: F-4696r853984_fix
Configure the operating system to generate audit records upon successful/unsuccessful attempts to use the "unlink", "unlinkat", "rename", "renameat", and "rmdir" syscalls. Add the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete -a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat,rmdir -F auid>=1000 -F auid!=unset -k delete The audit daemon must be restarted for the changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-031000
- Vuln IDs
-
- V-204574
- V-72209
- Rule IDs
-
- SV-204574r991589_rule
- SV-86833
Checks: C-4698r917828_chk
Verify "rsyslog" is configured to send all messages to a log aggregation server. Check the configuration of "rsyslog" with the following command: Note: If another logging package is used, substitute the utility configuration file for "/etc/rsyslog.conf". # grep @ /etc/rsyslog.conf /etc/rsyslog.d/*.conf *.* @@[logaggregationserver.example.mil]:[port] If there are no lines in the "/etc/rsyslog.conf" or "/etc/rsyslog.d/*.conf" files that contain the "@" or "@@" symbol(s), and the lines with the correct symbol(s) to send output to another system do not cover all "rsyslog" output, ask the system administrator to indicate how the audit logs are offloaded to a different system or media. If the lines are commented out or there is no evidence that the audit logs are being sent to another log aggregation server, this is a finding.
Fix: F-4698r917829_fix
Modify the "/etc/rsyslog.conf" or an "/etc/rsyslog.d/*.conf" file to contain a configuration line to send all "rsyslog" output to a log aggregation server: For UDP: *.* @[logaggregationserver.example.mil]:[port] For TCP: *.* @@[logaggregationserver.example.mil]:[port]
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-031010
- Vuln IDs
-
- V-204575
- V-72211
- Rule IDs
-
- SV-204575r991589_rule
- SV-86835
Checks: C-4699r88917_chk
Verify that the system is not accepting "rsyslog" messages from other systems unless it is documented as a log aggregation server. Check the configuration of "rsyslog" with the following command: # grep imtcp /etc/rsyslog.conf $ModLoad imtcp # grep imudp /etc/rsyslog.conf $ModLoad imudp # grep imrelp /etc/rsyslog.conf $ModLoad imrelp If any of the above modules are being loaded in the "/etc/rsyslog.conf" file, ask to see the documentation for the system being used for log aggregation. If the documentation does not exist, or does not specify the server as a log aggregation system, this is a finding.
Fix: F-4699r88918_fix
Modify the "/etc/rsyslog.conf" file to remove the "ModLoad imtcp", "ModLoad imudp", and "ModLoad imrelp" configuration lines, or document the system as being used for log aggregation.
- RMF Control
- AC-10
- Severity
- Low
- CCI
- CCI-000054
- Version
- RHEL-07-040000
- Vuln IDs
-
- V-204576
- V-72217
- Rule IDs
-
- SV-204576r958398_rule
- SV-86841
Checks: C-4700r88920_chk
Verify the operating system limits the number of concurrent sessions to "10" for all accounts and/or account types by issuing the following command: # grep "maxlogins" /etc/security/limits.conf /etc/security/limits.d/*.conf * hard maxlogins 10 This can be set as a global domain (with the * wildcard) but may be set differently for multiple domains. If the "maxlogins" item is missing, commented out, or the value is not set to "10" or less for all domains that have the "maxlogins" item assigned, this is a finding.
Fix: F-4700r88921_fix
Configure the operating system to limit the number of concurrent sessions to "10" for all accounts and/or account types. Add the following line to the top of the /etc/security/limits.conf or in a ".conf" file defined in /etc/security/limits.d/ : * hard maxlogins 10
- RMF Control
- CM-7
- Severity
- Medium
- CCI
- CCI-000382
- Version
- RHEL-07-040100
- Vuln IDs
-
- V-204577
- V-72219
- Rule IDs
-
- SV-204577r958480_rule
- SV-86843
Checks: C-4701r88923_chk
Inspect the firewall configuration and running services to verify that it is configured to prohibit or restrict the use of functions, ports, protocols, and/or services that are unnecessary or prohibited. Check which services are currently active with the following command: # firewall-cmd --list-all public (default, active) interfaces: enp0s3 sources: services: dhcpv6-client dns http https ldaps rpc-bind ssh ports: masquerade: no forward-ports: icmp-blocks: rich rules: Ask the System Administrator for the site or program PPSM CLSA. Verify the services allowed by the firewall match the PPSM CLSA. If there are additional ports, protocols, or services that are not in the PPSM CLSA, or there are ports, protocols, or services that are prohibited by the PPSM Category Assurance List (CAL), this is a finding.
Fix: F-4701r88924_fix
Update the host's firewall settings and/or running services to comply with the PPSM CLSA for the site or program and the PPSM CAL.
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-000068
- Version
- RHEL-07-040110
- Vuln IDs
-
- V-204578
- V-72221
- Rule IDs
-
- SV-204578r958408_rule
- SV-86845
Checks: C-4702r622305_chk
Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module. The location of the "sshd_config" file may vary if a different daemon is in use. Inspect the "Ciphers" configuration with the following command: # grep -i ciphers /etc/ssh/sshd_config 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-4702r622306_fix
Configure SSH to use FIPS 140-2 approved cryptographic algorithms. Add the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (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). Ciphers aes256-ctr,aes192-ctr,aes128-ctr The SSH service must be restarted for changes to take effect.
- RMF Control
- SC-10
- Severity
- Medium
- CCI
- CCI-001133
- Version
- RHEL-07-040160
- Vuln IDs
-
- V-204579
- V-72223
- Rule IDs
-
- SV-204579r970703_rule
- SV-86847
Checks: C-4703r858485_chk
Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: $ sudo grep -irw tmout /etc/profile /etc/bashrc /etc/profile.d etc/profile.d/tmout.sh:declare -xr TMOUT=900 If conflicting results are returned, this is a finding. If "TMOUT" is not set to "900" or less to enforce session termination after inactivity, this is a finding.
Fix: F-4703r646843_fix
Configure the operating system to terminate all network connections associated with a communications session at the end of the session or after a period of inactivity. Create a script to enforce the inactivity timeout (for example /etc/profile.d/tmout.sh) such as: #!/bin/bash declare -xr TMOUT=900
- RMF Control
- AC-8
- Severity
- Medium
- CCI
- CCI-000048
- Version
- RHEL-07-040170
- Vuln IDs
-
- V-204580
- V-72225
- Rule IDs
-
- SV-204580r958390_rule
- SV-86849
Checks: C-4704r297485_chk
Verify any publicly accessible connection to the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Check for the location of the banner file being used with the following command: # grep -i banner /etc/ssh/sshd_config banner /etc/issue This command will return the banner keyword and the name of the file that contains the ssh banner (in this case "/etc/issue"). If the line is commented out, this is a finding. View the file specified by the banner keyword to check that it matches the text of the Standard Mandatory DoD Notice and Consent Banner: "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 system does not display a graphical logon banner or the banner does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding. If the text in the file does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding.
Fix: F-4704r297486_fix
Configure the operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system via the ssh. Edit the "/etc/ssh/sshd_config" file to uncomment the banner keyword and configure it to point to a file that will contain the logon banner (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). An example configuration line is: banner /etc/issue Either create the file containing the banner or replace the text in the file with the Standard Mandatory DoD Notice and Consent Banner. The DoD required text is: "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." The SSH service must be restarted for changes to take effect.
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-001453
- Version
- RHEL-07-040180
- Vuln IDs
-
- V-204581
- V-72227
- Rule IDs
-
- SV-204581r991554_rule
- SV-86851
Checks: C-4705r942904_chk
If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP authentication sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" the LDAP is currently using: # grep -ir id_provider /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Ensure that LDAP is configured to use TLS by using the following command: # grep -ir start_tls /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf ldap_id_use_start_tls = true If the "ldap_id_use_start_tls" option is not "true", this is a finding.
Fix: F-4705r942905_fix
Configure the operating system to implement cryptography to protect the integrity of LDAP authentication sessions. Add or modify the following line in "/etc/sssd/sssd.conf": ldap_id_use_start_tls = true
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-001453
- Version
- RHEL-07-040190
- Vuln IDs
-
- V-204582
- V-72229
- Rule IDs
-
- SV-204582r991554_rule
- SV-86853
Checks: C-4706r942907_chk
If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" the LDAP is currently using: # grep -ir id_provider /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Verify the sssd service is configured to require the use of certificates: # grep -ir tls_reqcert /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf ldap_tls_reqcert = demand If the "ldap_tls_reqcert" setting is missing, commented out, or does not exist, this is a finding. If the "ldap_tls_reqcert" setting is not set to "demand" or "hard", this is a finding.
Fix: F-4706r942908_fix
Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions. Add or modify the following line in "/etc/sssd/sssd.conf": ldap_tls_reqcert = demand
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-001453
- Version
- RHEL-07-040200
- Vuln IDs
-
- V-204583
- V-72231
- Rule IDs
-
- SV-204583r991554_rule
- SV-86855
Checks: C-4707r942910_chk
If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Determine the "id_provider" that the LDAP is currently using: # grep -ir id_provider /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf id_provider = ad If "id_provider" is set to "ad", this is Not Applicable. Check the path to the X.509 certificate for peer authentication with the following command: # grep -ir tls_cacert /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf ldap_tls_cacert = /etc/pki/tls/certs/ca-bundle.crt Verify the "ldap_tls_cacert" option points to a file that contains the trusted CA certificate. If this file does not exist, or the option is commented out or missing, this is a finding.
Fix: F-4707r942911_fix
Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions. Add or modify the following line in "/etc/sssd/sssd.conf": ldap_tls_cacert = /etc/pki/tls/certs/ca-bundle.crt
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040201
- Vuln IDs
-
- V-204584
- V-77825
- Rule IDs
-
- SV-204584r991589_rule
- SV-92521
Checks: C-4708r880792_chk
Verify the operating system implements virtual address space randomization. # grep -r kernel.randomize_va_space /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null kernel.randomize_va_space = 2 If "kernel.randomize_va_space" is not configured in the /etc/sysctl.conf file or or in any of the other sysctl.d directories, is commented out or does not have a value of "2", this is a finding. Check that the operating system implements virtual address space randomization with the following command: # /sbin/sysctl -a | grep kernel.randomize_va_space kernel.randomize_va_space = 2 If "kernel.randomize_va_space" does not have a value of "2", this is a finding. If conflicting results are returned, this is a finding.
Fix: F-4708r880793_fix
Configure the operating system implement virtual address space randomization. Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a config file in the /etc/sysctl.d/ directory (or modify the line to have the required value): kernel.randomize_va_space = 2 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- SC-8
- Severity
- Medium
- CCI
- CCI-002418
- Version
- RHEL-07-040300
- Vuln IDs
-
- V-204585
- V-72233
- Rule IDs
-
- SV-204585r958908_rule
- SV-86857
Checks: C-4709r88947_chk
Check to see if sshd is installed with the following command: # yum list installed \*ssh\* libssh2.x86_64 1.4.3-8.el7 @anaconda/7.1 openssh.x86_64 6.6.1p1-11.el7 @anaconda/7.1 openssh-server.x86_64 6.6.1p1-11.el7 @anaconda/7.1 If the "SSH server" package is not installed, this is a finding.
Fix: F-4709r88948_fix
Install SSH packages onto the host with the following commands: # yum install openssh-server.x86_64
- RMF Control
- SC-8
- Severity
- Medium
- CCI
- CCI-002418
- Version
- RHEL-07-040310
- Vuln IDs
-
- V-204586
- V-72235
- Rule IDs
-
- SV-204586r958908_rule
- SV-86859
Checks: C-4710r88950_chk
Verify SSH is loaded and active with the following command: # systemctl status sshd sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled) Active: active (running) since Tue 2015-11-17 15:17:22 EST; 4 weeks 0 days ago Main PID: 1348 (sshd) CGroup: /system.slice/sshd.service 1053 /usr/sbin/sshd -D If "sshd" does not show a status of "active" and "running", this is a finding.
Fix: F-4710r88951_fix
Configure the SSH service to automatically start after reboot with the following command: # systemctl enable sshd.service
- RMF Control
- SC-10
- Severity
- Medium
- CCI
- CCI-001133
- Version
- RHEL-07-040320
- Vuln IDs
-
- V-204587
- V-72237
- Rule IDs
-
- SV-204587r970703_rule
- SV-86861
Checks: C-4711r917831_chk
Verify the SSH server automatically terminates a user session after the SSH client has been unresponsive for 10 minutes. Check for the value of the "ClientAliveInterval" keyword with the following command: # grep -iw clientaliveinterval /etc/ssh/sshd_config ClientAliveInterval 600 If "ClientAliveInterval" is not configured, is commented out, or has a value of "0", this is a finding. If "ClientAliveInterval" has a value that is greater than "600" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Fix: F-4711r917832_fix
Note: This setting must be applied in conjunction with RHEL-07-040340 to function correctly. Configure the SSH server to terminate a user session automatically after the SSH client has been unresponsive for 10 minutes. Add the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (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): ClientAliveInterval 600 The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040330
- Vuln IDs
-
- V-204588
- V-72239
- Rule IDs
-
- SV-204588r991589_rule
- SV-86863
Checks: C-4712r88956_chk
Check the version of the operating system with the following command: # cat /etc/redhat-release If the release is 7.4 or newer this requirement is Not Applicable. Verify the SSH daemon does not allow authentication using RSA rhosts authentication. To determine how the SSH daemon's "RhostsRSAAuthentication" option is set, run the following command: # grep RhostsRSAAuthentication /etc/ssh/sshd_config RhostsRSAAuthentication no If the value is returned as "yes", the returned line is commented out, or no output is returned, this is a finding.
Fix: F-4712r88957_fix
Configure the SSH daemon to not allow authentication using RSA rhosts authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no": RhostsRSAAuthentication no The SSH service must be restarted for changes to take effect.
- RMF Control
- SC-10
- Severity
- Medium
- CCI
- CCI-001133
- Version
- RHEL-07-040340
- Vuln IDs
-
- V-204589
- V-72241
- Rule IDs
-
- SV-204589r970703_rule
- SV-86865
Checks: C-4713r917834_chk
Verify the SSH server automatically terminates a user session after the SSH client has become unresponsive. Check for the value of the "ClientAliveCountMax" keyword with the following command: # grep -i clientalivecount /etc/ssh/sshd_config ClientAliveCountMax 0 If "ClientAliveCountMax" is not set to "0", this is a finding.
Fix: F-4713r917835_fix
Note: This setting must be applied in conjunction with RHEL-07-040320 to function correctly. Configure the SSH server to terminate a user session automatically after the SSH client has become unresponsive. Add the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (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): ClientAliveCountMax 0 The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040350
- Vuln IDs
-
- V-204590
- V-72243
- Rule IDs
-
- SV-204590r991589_rule
- SV-86867
Checks: C-4714r88962_chk
Verify the SSH daemon does not allow authentication using known hosts authentication. To determine how the SSH daemon's "IgnoreRhosts" option is set, run the following command: # grep -i IgnoreRhosts /etc/ssh/sshd_config IgnoreRhosts 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-4714r88963_fix
Configure the 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": IgnoreRhosts yes
- RMF Control
- AC-9
- Severity
- Medium
- CCI
- CCI-000052
- Version
- RHEL-07-040360
- Vuln IDs
-
- V-204591
- V-72245
- Rule IDs
-
- SV-204591r991589_rule
- SV-86869
Checks: C-4715r88965_chk
Verify SSH provides users with 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: # 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-4715r88966_fix
Configure SSH to provide users with feedback on when account accesses last occurred by setting the required configuration options in "/etc/pam.d/sshd" or in the "sshd_config" file used by the system ("/etc/ssh/sshd_config" will be used in the example) (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). Modify the "PrintLastLog" line in "/etc/ssh/sshd_config" to match the following: PrintLastLog yes The SSH service must be restarted for changes to "sshd_config" to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040370
- Vuln IDs
-
- V-204592
- V-72247
- Rule IDs
-
- SV-204592r991589_rule
- SV-86871
Checks: C-4716r88968_chk
Verify remote access using SSH prevents users from logging on directly as root. Check that SSH prevents users from logging on directly as root with the following command: # 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-4716r88969_fix
Configure SSH to stop users from logging on remotely as the root user. Edit the appropriate "/etc/ssh/sshd_config" file to uncomment or add the line for the "PermitRootLogin" 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): PermitRootLogin no The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040380
- Vuln IDs
-
- V-204593
- V-72249
- Rule IDs
-
- SV-204593r991589_rule
- SV-86873
Checks: C-4717r88971_chk
Verify the SSH daemon does not allow authentication using known hosts authentication. To determine how the SSH daemon's "IgnoreUserKnownHosts" option is set, run the following command: # 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-4717r88972_fix
Configure the 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 The SSH service must be restarted for changes to take effect.
- RMF Control
- IA-5
- Severity
- High
- CCI
- CCI-000197
- Version
- RHEL-07-040390
- Vuln IDs
-
- V-204594
- V-72251
- Rule IDs
-
- SV-204594r987796_rule
- SV-86875
Checks: C-4718r88974_chk
Check the version of the operating system with the following command: # cat /etc/redhat-release If the release is 7.4 or newer this requirement is Not Applicable. Verify the SSH daemon is configured to only use the SSHv2 protocol. Check that the SSH daemon is configured to only use the SSHv2 protocol with the following command: # grep -i protocol /etc/ssh/sshd_config Protocol 2 #Protocol 1,2 If any protocol line other than "Protocol 2" is uncommented, this is a finding.
Fix: F-4718r88975_fix
Remove all Protocol lines that reference version "1" in "/etc/ssh/sshd_config" (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). The "Protocol" line must be as follows: Protocol 2 The SSH service must be restarted for changes to take effect.
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-001453
- Version
- RHEL-07-040400
- Vuln IDs
-
- V-204595
- V-72253
- Rule IDs
-
- SV-204595r991554_rule
- SV-86877
Checks: C-4719r622308_chk
Verify the SSH daemon is configured to only use MACs employing FIPS 140-2-approved hashes. Note: If RHEL-07-021350 is a finding, this is automatically a finding as the system cannot implement FIPS 140-2-approved cryptographic algorithms and hashes. Check that the SSH daemon is configured to only use MACs employing FIPS 140-2-approved hashes with the following command: # 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-4719r622309_fix
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" (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): MACs hmac-sha2-512,hmac-sha2-256 The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040410
- Vuln IDs
-
- V-204596
- V-72255
- Rule IDs
-
- SV-204596r991589_rule
- SV-86879
Checks: C-4720r88980_chk
Verify the SSH 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 '*.pub' -exec ls -lL {} \; -rw-r--r-- 1 root root 618 Nov 28 06:43 ssh_host_dsa_key.pub -rw-r--r-- 1 root root 347 Nov 28 06:43 ssh_host_key.pub -rw-r--r-- 1 root root 238 Nov 28 06:43 ssh_host_rsa_key.pub If any file has a mode more permissive than "0644", this is a finding.
Fix: F-4720r88981_fix
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: # chmod 0644 /etc/ssh/*.key.pub
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040420
- Vuln IDs
-
- V-204597
- V-72257
- Rule IDs
-
- SV-204597r991589_rule
- SV-86881
Checks: C-4721r880741_chk
Verify the SSH private host key files have mode "0640" or less permissive. The following command will find all SSH private key files on the system and list their modes: # find / -name '*ssh_host*key' | xargs ls -lL -rw-r----- 1 root ssh_keys 112 Apr 1 11:59 ssh_host_dsa_key -rw-r----- 1 root ssh_keys 202 Apr 1 11:59 ssh_host_key -rw-r----- 1 root ssh_keys 352 Apr 1 11:59 ssh_host_rsa_key If any file has a mode more permissive than "0640", this is a finding.
Fix: F-4721r880742_fix
Configure the mode of SSH private host key files under "/etc/ssh" to "0640" with the following command: # chmod 0640 /path/to/file/ssh_host*key
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-040430
- Vuln IDs
-
- V-204598
- V-72259
- Rule IDs
-
- SV-204598r958796_rule
- SV-86883
Checks: C-4722r88986_chk
Verify the SSH daemon does not permit GSSAPI authentication unless approved. Check that the SSH daemon does not permit GSSAPI authentication with the following command: # grep -i gssapiauth /etc/ssh/sshd_config GSSAPIAuthentication no If the "GSSAPIAuthentication" keyword is missing, is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.
Fix: F-4722r88987_fix
Uncomment the "GSSAPIAuthentication" keyword in "/etc/ssh/sshd_config" (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) and set the value to "no": GSSAPIAuthentication no The SSH service must be restarted for changes to take effect. If GSSAPI authentication is required, it must be documented, to include the location of the configuration file, with the ISSO.
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-000318
- Version
- RHEL-07-040440
- Vuln IDs
-
- V-204599
- V-72261
- Rule IDs
-
- SV-204599r958796_rule
- SV-86885
Checks: C-4723r88989_chk
Verify the SSH daemon does not permit Kerberos to authenticate passwords unless approved. Check that the SSH daemon does not permit Kerberos to authenticate passwords with the following command: # grep -i kerberosauth /etc/ssh/sshd_config KerberosAuthentication no If the "KerberosAuthentication" keyword is missing, or is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.
Fix: F-4723r88990_fix
Uncomment the "KerberosAuthentication" keyword in "/etc/ssh/sshd_config" (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) and set the value to "no": KerberosAuthentication no The SSH service must be restarted for changes to take effect. If Kerberos authentication is required, it must be documented, to include the location of the configuration file, with the ISSO.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040450
- Vuln IDs
-
- V-204600
- V-72263
- Rule IDs
-
- SV-204600r991589_rule
- SV-86887
Checks: C-4724r88992_chk
Verify the SSH daemon performs strict mode checking of home directory configuration files. The location of the "sshd_config" file may vary if a different daemon is in use. Inspect the "sshd_config" file with the following command: # 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-4724r88993_fix
Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" (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) and set the value to "yes": StrictModes yes The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040460
- Vuln IDs
-
- V-204601
- V-72265
- Rule IDs
-
- SV-204601r991589_rule
- SV-86889
Checks: C-4725r88995_chk
Verify the SSH daemon performs privilege separation. Check that the SSH daemon performs privilege separation with the following command: # grep -i usepriv /etc/ssh/sshd_config UsePrivilegeSeparation sandbox If the "UsePrivilegeSeparation" keyword is set to "no", is missing, or the returned line is commented out, this is a finding.
Fix: F-4725r88996_fix
Uncomment the "UsePrivilegeSeparation" keyword in "/etc/ssh/sshd_config" (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) and set the value to "sandbox" or "yes": UsePrivilegeSeparation sandbox The SSH service must be restarted for changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040470
- Vuln IDs
-
- V-204602
- V-72267
- Rule IDs
-
- SV-204602r991589_rule
- SV-86891
Checks: C-4726r880756_chk
Note: For RHEL 7.4 and above, this requirement is not applicable. Verify the 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: # 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-4726r880757_fix
Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" (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) on the system and set the value to "delayed" or "no": Compression no The SSH service must be restarted for changes to take effect.
- RMF Control
- AU-8
- Severity
- Medium
- CCI
- CCI-001891
- Version
- RHEL-07-040500
- Vuln IDs
-
- V-204603
- V-72269
- Rule IDs
-
- SV-204603r982208_rule
- SV-86893
Checks: C-4727r809209_chk
Check to see if NTP is running in continuous mode: # ps -ef | grep ntp If NTP is not running, check to see if "chronyd" is running in continuous mode: # ps -ef | grep chronyd If NTP or "chronyd" is not running, this is a finding. If the NTP process is found, then check the "ntp.conf" file for the "maxpoll" option setting: # grep maxpoll /etc/ntp.conf server 0.rhel.pool.ntp.org iburst maxpoll 16 If the "maxpoll" option is set to a number greater than 16 or the line is commented out, this is a finding. If the file does not exist, check the "/etc/cron.daily" subdirectory for a crontab file controlling the execution of the "ntpd -q" command. # grep -i "ntpd -q" /etc/cron.daily/* # ls -al /etc/cron.* | grep ntp ntp If a crontab file does not exist in the "/etc/cron.daily" that executes the "ntpd -q" command, this is a finding. If the "chronyd" process is found, then check the "chrony.conf" file for the "maxpoll" option setting: # grep maxpoll /etc/chrony.conf server 0.rhel.pool.ntp.org iburst maxpoll 16 If the option is not set or the line is commented out, this is a finding.
Fix: F-4727r809210_fix
Edit the "/etc/ntp.conf" or "/etc/chrony.conf" file and add or update an entry to define "maxpoll" to "16" as follows: server 0.rhel.pool.ntp.org iburst maxpoll 16 If NTP was running and "maxpoll" was updated, the NTP service must be restarted: # systemctl restart ntpd If NTP was not running, it must be started: # systemctl start ntpd If "chronyd" was running and "maxpoll" was updated, the service must be restarted: # systemctl restart chronyd.service If "chronyd" was not running, it must be started: # systemctl start chronyd.service
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040520
- Vuln IDs
-
- V-204604
- V-72273
- Rule IDs
-
- SV-204604r991589_rule
- SV-86897
Checks: C-4728r89004_chk
Verify the operating system enabled an application firewall. Check to see if "firewalld" is installed with the following command: # yum list installed firewalld firewalld-0.3.9-11.el7.noarch.rpm If the "firewalld" package is not installed, ask the System Administrator if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Check to see if the firewall is loaded and active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Tue 2014-06-17 11:14:49 CEST; 5 days ago If "firewalld" does not show a status of "loaded" and "active", this is a finding. Check the state of the firewall: # firewall-cmd --state running If "firewalld" does not show a state of "running", this is a finding.
Fix: F-4728r89005_fix
Ensure the operating system's application firewall is enabled. Install the "firewalld" package, if it is not on the system, with the following command: # yum install firewalld Start the firewall via "systemctl" with the following command: # systemctl start firewalld
- RMF Control
- AC-9
- Severity
- Low
- CCI
- CCI-000052
- Version
- RHEL-07-040530
- Vuln IDs
-
- V-204605
- V-72275
- Rule IDs
-
- SV-204605r991589_rule
- SV-86899
Checks: C-4729r89007_chk
Verify 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/postlogin session required pam_lastlog.so showfailed If "pam_lastlog" is missing from "/etc/pam.d/postlogin" file, or the silent option is present, this is a finding.
Fix: F-4729r89008_fix
Configure the operating system to provide users with feedback on when account accesses last occurred by setting the required configuration options in "/etc/pam.d/postlogin". Add the following line to the top of "/etc/pam.d/postlogin": session required pam_lastlog.so showfailed
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-040540
- Vuln IDs
-
- V-204606
- V-72277
- Rule IDs
-
- SV-204606r991589_rule
- SV-86901
Checks: C-4730r89010_chk
Verify there are no ".shosts" files on the 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-4730r89011_fix
Remove any found ".shosts" files from the system. # rm /[path]/[to]/[file]/.shosts
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-040550
- Vuln IDs
-
- V-204607
- V-72279
- Rule IDs
-
- SV-204607r991589_rule
- SV-86903
Checks: C-4731r89013_chk
Verify there are no "shosts.equiv" files on the system. Check the system for the existence of these files with the following command: # find / -name shosts.equiv If any "shosts.equiv" files are found on the system, this is a finding.
Fix: F-4731r89014_fix
Remove any found "shosts.equiv" files from the system. # rm /[path]/[to]/[file]/shosts.equiv
- RMF Control
- CM-6
- Severity
- Low
- CCI
- CCI-000366
- Version
- RHEL-07-040600
- Vuln IDs
-
- V-204608
- V-72281
- Rule IDs
-
- SV-204608r991589_rule
- SV-86905
Checks: C-4732r297492_chk
Determine whether the system is using local or DNS name resolution with the following command: # grep hosts /etc/nsswitch.conf hosts: files dns If the DNS entry is missing from the host's line in the "/etc/nsswitch.conf" file, the "/etc/resolv.conf" file must be empty. Verify the "/etc/resolv.conf" file is empty with the following command: # ls -al /etc/resolv.conf -rw-r--r-- 1 root root 0 Aug 19 08:31 resolv.conf If local host authentication is being used and the "/etc/resolv.conf" file is not empty, this is a finding. If the DNS entry is found on the host's line of the "/etc/nsswitch.conf" file, verify the operating system is configured to use two or more name servers for DNS resolution. Determine the name servers used by the system with the following command: # grep nameserver /etc/resolv.conf nameserver 192.168.1.2 nameserver 192.168.1.3 If less than two lines are returned that are not commented out, this is a finding. Verify that the "/etc/resolv.conf" file is immutable with the following command: # sudo lsattr /etc/resolv.conf ----i----------- /etc/resolv.conf If the file is mutable and has not been documented with the Information System Security Officer (ISSO), this is a finding.
Fix: F-4732r89017_fix
Configure the operating system to use two or more name servers for DNS resolution. Edit the "/etc/resolv.conf" file to uncomment or add the two or more "nameserver" option lines with the IP address of local authoritative name servers. If local host resolution is being performed, the "/etc/resolv.conf" file must be empty. An empty "/etc/resolv.conf" file can be created as follows: # echo -n > /etc/resolv.conf And then make the file immutable with the following command: # chattr +i /etc/resolv.conf If the "/etc/resolv.conf" file must be mutable, the required configuration must be documented with the Information System Security Officer (ISSO) and the file must be verified by the system file integrity tool.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040610
- Vuln IDs
-
- V-204609
- V-72283
- Rule IDs
-
- SV-204609r991589_rule
- SV-86907
Checks: C-4733r880795_chk
Verify the system does not accept IPv4 source-routed packets. # grep -r net.ipv4.conf.all.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.all.accept_source_route = 0 If "net.ipv4.conf.all.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4733r880796_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.all.accept_source_route = 0 Issue the following command to make the changes take effect: # sysctl -system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040611
- Vuln IDs
-
- V-204610
- V-92251
- Rule IDs
-
- SV-204610r991589_rule
- SV-102353
Checks: C-4734r880798_chk
Verify the system uses a reverse-path filter for IPv4: # grep -r net.ipv4.conf.all.rp_filter /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.all.rp_filter = 1 If "net.ipv4.conf.all.rp_filter" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.all.rp_filter net.ipv4.conf.all.rp_filter = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding.
Fix: F-4734r880799_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.all.rp_filter = 1 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040612
- Vuln IDs
-
- V-204611
- V-92253
- Rule IDs
-
- SV-204611r991589_rule
- SV-102355
Checks: C-4735r880801_chk
Verify the system uses a reverse-path filter for IPv4: # grep -r net.ipv4.conf.default.rp_filter /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.default.rp_filter = 1 If "net.ipv4.conf.default.rp_filter" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv4.conf.default.rp_filter net.ipv4.conf.default.rp_filter = 1 If the returned line does not have a value of "1", this is a finding. If conflicting results are returned, this is a finding.
Fix: F-4735r880802_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.default.rp_filter = 1 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040620
- Vuln IDs
-
- V-204612
- V-72285
- Rule IDs
-
- SV-204612r991589_rule
- SV-86909
Checks: C-4736r880804_chk
Verify the system does not accept IPv4 source-routed packets by default. # grep -r net.ipv4.conf.default.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.conf.default.accept_source_route = 0 If "net.ipv4.conf.default.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4736r880805_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.default.accept_source_route = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040630
- Vuln IDs
-
- V-204613
- V-72287
- Rule IDs
-
- SV-204613r991589_rule
- SV-86911
Checks: C-4737r880807_chk
Verify the system does not respond to IPv4 ICMP echoes sent to a broadcast address. # grep -r net.ipv4.icmp_echo_ignore_broadcasts /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.icmp_echo_ignore_broadcasts" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "1", this is a finding. Check that the operating system implements the "icmp_echo_ignore_broadcasts" variable with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4737r880808_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.icmp_echo_ignore_broadcasts = 1 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040640
- Vuln IDs
-
- V-204614
- V-72289
- Rule IDs
-
- SV-204614r991589_rule
- SV-86913
Checks: C-4738r880810_chk
Verify the system will not accept IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.default.accept_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.default.accept_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the value of the "accept_redirects" variables with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4738r880811_fix
Set the system to not accept IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.default.accept_redirects = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040641
- Vuln IDs
-
- V-204615
- V-73175
- Rule IDs
-
- SV-204615r991589_rule
- SV-87827
Checks: C-4739r880813_chk
Verify the system ignores IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.all.accept_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.all.accept_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the "accept_redirects" variables with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4739r880814_fix
Set the system to ignore IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.all.accept_redirects = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040650
- Vuln IDs
-
- V-204616
- V-72291
- Rule IDs
-
- SV-204616r991589_rule
- SV-86915
Checks: C-4740r880816_chk
Verify the system does not allow interfaces to perform IPv4 ICMP redirects by default. # grep -r net.ipv4.conf.default.send_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.default.send_redirects" is not configured in the "/etc/sysctl.conf" file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the "default send_redirects" variables with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4740r880817_fix
Configure the 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 a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.default.send_redirects = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040660
- Vuln IDs
-
- V-204617
- V-72293
- Rule IDs
-
- SV-204617r991589_rule
- SV-86917
Checks: C-4741r880819_chk
Verify the system does not send IPv4 ICMP redirect messages. # grep -r net.ipv4.conf.all.send_redirects /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null If "net.ipv4.conf.all.send_redirects" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the "all send_redirects" variables with the following command: # /sbin/sysctl -a | grep 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. If conflicting results are returned, this is a finding.
Fix: F-4741r880820_fix
Configure the 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 a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.all.send_redirects = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040670
- Vuln IDs
-
- V-204618
- V-72295
- Rule IDs
-
- SV-204618r991589_rule
- SV-86919
Checks: C-4742r89046_chk
Verify 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-4742r89047_fix
Configure 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> multicast off promisc off
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040680
- Vuln IDs
-
- V-204619
- V-72297
- Rule IDs
-
- SV-204619r991589_rule
- SV-86921
Checks: C-4743r89049_chk
Verify the system is configured to prevent unrestricted mail relaying. Determine if "postfix" is installed with the following commands: # yum list installed postfix postfix-2.6.6-6.el7.x86_64.rpm If postfix is not installed, this is Not Applicable. If postfix is installed, determine if it is configured to reject connections from unknown or untrusted networks with the following command: # postconf -n smtpd_client_restrictions smtpd_client_restrictions = permit_mynetworks, reject If the "smtpd_client_restrictions" parameter contains any entries other than "permit_mynetworks" and "reject", this is a finding.
Fix: F-4743r89050_fix
If "postfix" is installed, modify the "/etc/postfix/main.cf" file to restrict client connections to the local network with the following command: # postconf -e 'smtpd_client_restrictions = permit_mynetworks,reject'
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-040690
- Vuln IDs
-
- V-204620
- V-72299
- Rule IDs
-
- SV-204620r991589_rule
- SV-86923
Checks: C-4744r89052_chk
Verify an FTP server has not been installed on the system. Check to see if an FTP server has been installed with the following commands: # yum list installed vsftpd vsftpd-3.0.2.el7.x86_64.rpm 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-4744r89053_fix
Document the "vsftpd" package with the ISSO as an operational requirement or remove it from the system with the following command: # yum remove vsftpd
- RMF Control
- CM-3
- Severity
- High
- CCI
- CCI-000318
- Version
- RHEL-07-040700
- Vuln IDs
-
- V-204621
- V-72301
- Rule IDs
-
- SV-204621r991589_rule
- SV-86925
Checks: C-4745r89055_chk
Verify a TFTP server has not been installed on the system. Check to see if a TFTP server has been installed with the following command: # yum list installed tftp-server tftp-server-0.49-9.el7.x86_64.rpm If TFTP is installed and the requirement for TFTP is not documented with the ISSO, this is a finding.
Fix: F-4745r89056_fix
Remove the TFTP package from the system with the following command: # yum remove tftp-server
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040710
- Vuln IDs
-
- V-204622
- V-72303
- Rule IDs
-
- SV-204622r991589_rule
- SV-86927
Checks: C-4746r622311_chk
Determine if X11Forwarding is disabled with the following command: # grep -i x11forwarding /etc/ssh/sshd_config | grep -v "^#" 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 or is missing, this is a finding.
Fix: F-4746r622312_fix
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 The SSH service must be restarted for changes to take effect: # systemctl restart sshd
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040720
- Vuln IDs
-
- V-204623
- V-72305
- Rule IDs
-
- SV-204623r991589_rule
- SV-86929
Checks: C-4747r89061_chk
Verify the TFTP daemon is configured to operate in secure mode. Check to see if a TFTP server has been installed with the following commands: # yum list installed tftp-server tftp-server.x86_64 x.x-x.el7 rhel-7-server-rpms If a TFTP server is not installed, this is Not Applicable. If a TFTP server is installed, check for the server arguments with the following command: # grep server_args /etc/xinetd.d/tftp server_args = -s /var/lib/tftpboot If the "server_args" line does not have a "-s" option and a subdirectory is not assigned, this is a finding.
Fix: F-4747r89062_fix
Configure the TFTP daemon to operate in secure mode by adding the following line to "/etc/xinetd.d/tftp" (or modify the line to have the required value): server_args = -s /var/lib/tftpboot
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040730
- Vuln IDs
-
- V-204624
- V-72307
- Rule IDs
-
- SV-204624r991589_rule
- SV-86931
Checks: C-36353r646845_chk
Verify the system is configured to boot to the command line: $ systemctl get-default multi-user.target If the system default target is not set to "multi-user.target" and the Information System Security Officer (ISSO) lacks a documented requirement for a graphical user interface, this is a finding. Verify a graphical user interface is not installed: $ rpm -qa | grep xorg | grep server Ask the System Administrator if use of a graphical user interface is an operational requirement. If the use of a graphical user interface on the system is not documented with the ISSO, this is a finding.
Fix: F-36316r646846_fix
Document the requirement for a graphical user interface with the ISSO or reinstall the operating system without the graphical user interface. If reinstallation is not feasible, then continue with the following procedure: Open an SSH session and enter the following commands: $ sudo systemctl set-default multi-user.target $ sudo yum remove xorg-x11-server-Xorg xorg-x11-server-common xorg-x11-server-utils A reboot is required for the changes to take effect.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040740
- Vuln IDs
-
- V-204625
- V-72309
- Rule IDs
-
- SV-204625r991589_rule
- SV-86933
Checks: C-4749r880822_chk
Verify the system is not performing packet forwarding, unless the system is a router. # grep -r net.ipv4.ip_forward /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv4.ip_forward = 0 If "net.ipv4.ip_forward" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out, or does not have a value of "0", this is a finding. Check that the operating system does not implement IP forwarding using the following command: # /sbin/sysctl -a | grep net.ipv4.ip_forward net.ipv4.ip_forward = 0 If IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding. If conflicting results are returned, this is a finding.
Fix: F-4749r880823_fix
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.ip_forward = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040750
- Vuln IDs
-
- V-204626
- V-72311
- Rule IDs
-
- SV-204626r991589_rule
- SV-86935
Checks: C-4750r89070_chk
Verify "AUTH_GSS" is being used to authenticate NFS mounts. To check if the system is importing an NFS file system, look for any entries in the "/etc/fstab" file that have a file system type of "nfs" with the following command: # cat /etc/fstab | grep nfs 192.168.21.5:/mnt/export /data1 nfs4 rw,sync ,soft,sec=krb5:krb5i:krb5p If the system is mounting file systems via NFS and has the sec option without the "krb5:krb5i:krb5p" settings, the "sec" option has the "sys" setting, or the "sec" option is missing, this is a finding.
Fix: F-4750r89071_fix
Update the "/etc/fstab" file so the option "sec" is defined for each NFS mounted file system and the "sec" option does not have the "sys" setting. Ensure the "sec" option is defined as "krb5:krb5i:krb5p".
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-040800
- Vuln IDs
-
- V-204627
- V-72313
- Rule IDs
-
- SV-204627r991589_rule
- SV-86937
Checks: C-4751r89073_chk
Verify that a system using SNMP is not using default community strings. Check to see if the "/etc/snmp/snmpd.conf" file exists with the following command: # ls -al /etc/snmp/snmpd.conf -rw------- 1 root root 52640 Mar 12 11:08 snmpd.conf If the file does not exist, this is Not Applicable. If the file does exist, check for the default community strings with the following commands: # grep public /etc/snmp/snmpd.conf # grep private /etc/snmp/snmpd.conf If either of these commands returns any output, this is a finding.
Fix: F-4751r89074_fix
If the "/etc/snmp/snmpd.conf" file exists, modify any lines that contain a community string value of "public" or "private" to another string value.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040810
- Vuln IDs
-
- V-204628
- V-72315
- Rule IDs
-
- SV-204628r991589_rule
- SV-86939
Checks: C-4752r89076_chk
If the "firewalld" package is not installed, ask the System Administrator (SA) if another firewall application (such as iptables) is installed. If an application firewall is not installed, this is a finding. Verify the system's access control program is configured to grant or deny system access to specific hosts. Check to see if "firewalld" is active with the following command: # systemctl status firewalld firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) Active: active (running) since Sun 2014-04-20 14:06:46 BST; 30s ago If "firewalld" is active, check to see if it is configured to grant or deny access to specific hosts or services with the following commands: # firewall-cmd --get-default-zone public # firewall-cmd --list-all --zone=public public (active) target: default icmp-block-inversion: no interfaces: eth0 sources: services: mdns ssh ports: protocols: masquerade: no forward-ports: icmp-blocks: If "firewalld" is not active, determine whether "tcpwrappers" is being used by checking whether the "hosts.allow" and "hosts.deny" files are empty with the following commands: # ls -al /etc/hosts.allow rw-r----- 1 root root 9 Aug 2 23:13 /etc/hosts.allow # ls -al /etc/hosts.deny -rw-r----- 1 root root 9 Apr 9 2007 /etc/hosts.deny If "firewalld" and "tcpwrappers" are not installed, configured, and active, ask the SA if another access control program (such as iptables) is installed and active. Ask the SA to show that the running configuration grants or denies access to specific hosts or services. If "firewalld" is active and is not configured to grant access to specific hosts or "tcpwrappers" is not configured to grant or deny access to specific hosts, this is a finding.
Fix: F-4752r89077_fix
If "firewalld" is installed and active on the system, configure rules for allowing specific services and hosts. If "firewalld" is not "active", enable "tcpwrappers" by configuring "/etc/hosts.allow" and "/etc/hosts.deny" to allow or deny access to specific hosts.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040820
- Vuln IDs
-
- V-204629
- V-72317
- Rule IDs
-
- SV-204629r991589_rule
- SV-86941
Checks: C-4753r89079_chk
Verify the system does not have unauthorized IP tunnels configured. Check to see if "libreswan" is installed with the following command: # yum list installed libreswan libreswan.x86-64 3.20-5.el7_4 If "libreswan" is installed, check to see if the "IPsec" service is active with the following command: # systemctl status ipsec ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled) Active: inactive (dead) If the "IPsec" service is active, check to see if any tunnels are configured in "/etc/ipsec.conf" and "/etc/ipsec.d/" with the following commands: # grep -iw conn /etc/ipsec.conf /etc/ipsec.d/*.conf If there are indications that a "conn" parameter is configured for a tunnel, ask the System Administrator if the tunnel is documented with the ISSO. If "libreswan" is installed, "IPsec" is active, and an undocumented tunnel is active, this is a finding.
Fix: F-4753r89080_fix
Remove all unapproved tunnels from the system, or document them with the ISSO.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040830
- Vuln IDs
-
- V-204630
- V-72319
- Rule IDs
-
- SV-204630r991589_rule
- SV-86943
Checks: C-4754r880825_chk
If IPv6 is not enabled, the key will not exist, and this is Not Applicable. Verify the system does not accept IPv6 source-routed packets. # grep -r net.ipv6.conf.all.accept_source_route /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null net.ipv6.conf.all.accept_source_route = 0 If "net.ipv6.conf.all.accept_source_route" is not configured in the /etc/sysctl.conf file or in any of the other sysctl.d directories, is commented out or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep net.ipv6.conf.all.accept_source_route net.ipv6.conf.all.accept_source_route = 0 If the returned lines do not have a value of "0", this is a finding. If conflicting results are returned, this is a finding.
Fix: F-4754r880826_fix
Set the system to the required kernel parameter, if IPv6 is enabled, by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv6.conf.all.accept_source_route = 0 Issue the following command to make the changes take effect: # sysctl --system
- RMF Control
- IA-2
- Severity
- Medium
- CCI
- CCI-001948
- Version
- RHEL-07-041001
- Vuln IDs
-
- V-204631
- V-72417
- Rule IDs
-
- SV-204631r982216_rule
- SV-87041
Checks: C-4755r462472_chk
Verify the operating system has the packages required for multifactor authentication installed. Check for the presence of the packages required to support multifactor authentication with the following commands: # yum list installed pam_pkcs11 pam_pkcs11-0.6.2-14.el7.noarch.rpm If the "pam_pkcs11" package is not installed, this is a finding.
Fix: F-4755r462473_fix
Configure the operating system to implement multifactor authentication by installing the required packages. Install the pam_pkcs11 package with the following command: # yum install pam_pkcs11
- RMF Control
- IA-2
- Severity
- Medium
- CCI
- CCI-001948
- Version
- RHEL-07-041002
- Vuln IDs
-
- V-204632
- V-72427
- Rule IDs
-
- SV-204632r982216_rule
- SV-87051
Checks: C-4756r89088_chk
Verify the operating system implements multifactor authentication for remote access to privileged accounts via pluggable authentication modules (PAM). Check the "/etc/sssd/sssd.conf" file for the authentication services that are being used with the following command: # grep services /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf services = nss, pam If the "pam" service is not present on all "services" lines, this is a finding.
Fix: F-4756r89089_fix
Configure the operating system to implement multifactor authentication for remote access to privileged accounts via pluggable authentication modules (PAM). Modify all of the services lines in "/etc/sssd/sssd.conf" or in configuration files found under "/etc/sssd/conf.d" to include pam.
- RMF Control
- IA-2
- Severity
- Medium
- CCI
- CCI-001948
- Version
- RHEL-07-041003
- Vuln IDs
-
- V-204633
- V-72433
- Rule IDs
-
- SV-204633r982216_rule
- SV-87057
Checks: C-4757r89091_chk
Verify the operating system implements certificate status checking for PKI authentication. Check to see if Online Certificate Status Protocol (OCSP) is enabled on the system with the following command: # grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf | grep -v "^#" cert_policy = ca, ocsp_on, signature; cert_policy = ca, ocsp_on, signature; cert_policy = ca, ocsp_on, signature; There should be at least three lines returned. If "ocsp_on" is not present in all uncommented "cert_policy" lines in "/etc/pam_pkcs11/pam_pkcs11.conf", this is a finding.
Fix: F-4757r89092_fix
Configure the operating system to do certificate status checking for PKI authentication. Modify all of the "cert_policy" lines in "/etc/pam_pkcs11/pam_pkcs11.conf" to include "ocsp_on".
- RMF Control
- AC-18
- Severity
- Medium
- CCI
- CCI-001443
- Version
- RHEL-07-041010
- Vuln IDs
-
- V-204634
- V-73177
- Rule IDs
-
- SV-204634r971547_rule
- SV-87829
Checks: C-4758r89094_chk
Verify that there are no wireless interfaces configured on the system. This is N/A for systems that do not have wireless network adapters. Check for the presence of active wireless interfaces with the following command: # nmcli device DEVICE TYPE STATE eth0 ethernet connected wlp3s0 wifi disconnected lo loopback unmanaged If a wireless interface is configured and its use on the system is not documented with the Information System Security Officer (ISSO), this is a finding.
Fix: F-4758r89095_fix
Configure the system to disable all wireless network interfaces with the following command: #nmcli radio wifi off
- RMF Control
- CM-5
- Severity
- High
- CCI
- CCI-001749
- Version
- RHEL-07-010020
- Vuln IDs
-
- V-214799
- V-71855
- Rule IDs
-
- SV-214799r991589_rule
- SV-86479
Checks: C-15999r192362_chk
Verify the cryptographic hash of system files and commands match the vendor values. Check the cryptographic hash of system files and commands with the following command: Note: System configuration files (indicated by a "c" in the second column) are expected to change over time. Unusual modifications should be investigated through the system audit log. # rpm -Va --noconfig | grep '^..5' If there is any output from the command for system files or binaries, this is a finding.
Fix: F-15997r192363_fix
Run the following command to determine which package owns the file: # rpm -qf <filename> The package can be reinstalled from a yum repository using the command: # sudo yum reinstall <packagename> Alternatively, the package can be reinstalled from trusted media using the command: # sudo rpm -Uvh <packagename>
- RMF Control
- SI-4
- Severity
- Medium
- CCI
- CCI-001263
- Version
- RHEL-07-020019
- Vuln IDs
-
- V-214800
- V-92255
- Rule IDs
-
- SV-214800r991589_rule
- SV-102357
Checks: C-16000r942886_chk
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-36317r942887_fix
Install and enable the latest Trellix ENSLTP package.
- RMF Control
- SI-3
- Severity
- High
- CCI
- CCI-001668
- Version
- RHEL-07-032000
- Vuln IDs
-
- V-214801
- V-72213
- Rule IDs
-
- SV-214801r991589_rule
- SV-86837
Checks: C-16001r192368_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-15999r192369_fix
Install an antivirus solution on the system.
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010062
- Vuln IDs
-
- V-214937
- V-78995
- Rule IDs
-
- SV-214937r958402_rule
- SV-93701
Checks: C-16137r880765_chk
Verify the operating system prevents a user from overriding the screensaver lock-enabled setting for the graphical user interface. Note: If the system does not have GNOME installed, this requirement is Not Applicable. Determine which profile the system database is using with the following command: # grep system-db /etc/dconf/profile/user system-db:local Check for the lock-enabled setting with the following command: Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. # grep -i lock-enabled /etc/dconf/db/local.d/locks/* /org/gnome/desktop/screensaver/lock-enabled If the command does not return a result, this is a finding.
Fix: F-16135r880766_fix
Configure the operating system to prevent a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. Create a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory. # touch /etc/dconf/db/local.d/locks/session Add the setting to lock the screensaver lock-enabled setting: /org/gnome/desktop/screensaver/lock-enabled
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-020111
- Vuln IDs
-
- V-219059
- V-100023
- Rule IDs
-
- SV-219059r958498_rule
- SV-109127
Checks: C-36354r602662_chk
Note: If the operating system does not have a graphical user interface installed, this requirement is Not Applicable. Verify the operating system disables the ability to automount devices in a graphical user interface. Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. Check to see if automounter service is disabled with the following commands: # cat /etc/dconf/db/local.d/00-No-Automount [org/gnome/desktop/media-handling] automount=false automount-open=false autorun-never=true If the output does not match the example above, this is a finding. # cat /etc/dconf/db/local.d/locks/00-No-Automount /org/gnome/desktop/media-handling/automount /org/gnome/desktop/media-handling/automount-open /org/gnome/desktop/media-handling/autorun-never If the output does not match the example, this is a finding.
Fix: F-36318r602663_fix
Configure the graphical user interface to disable the ability to automount devices. Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used. Create or edit the /etc/dconf/db/local.d/00-No-Automount file and add the following: [org/gnome/desktop/media-handling] automount=false automount-open=false autorun-never=true Create or edit the /etc/dconf/db/local.d/locks/00-No-Automount file and add the following: /org/gnome/desktop/media-handling/automount /org/gnome/desktop/media-handling/automount-open /org/gnome/desktop/media-handling/autorun-never Run the following command to update the database: # dconf update
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-021031
- Vuln IDs
-
- V-228563
- Rule IDs
-
- SV-228563r991589_rule
Checks: C-36355r744118_chk
The following command will discover and print world-writable directories that are not owned by a system account, assuming only system accounts have a UID lower than 1000. Run it once for each local partition [PART]: # find [PART] -xdev -type d -perm -0002 -uid +999 -print If there is output, this is a finding.
Fix: F-19547r377220_fix
All directories in local partitions which are world-writable should be owned by root or another system account. If any world-writable directories are not owned by a system account, this should be investigated. Following this, the files should be deleted or assigned to an appropriate group.
- RMF Control
- AU-9
- Severity
- Medium
- CCI
- CCI-000162
- Version
- RHEL-07-910055
- Vuln IDs
-
- V-228564
- Rule IDs
-
- SV-228564r958434_rule
Checks: C-23614r419769_chk
Verify the operating system audit records have proper permissions and ownership. List the full permissions and ownership of the audit log files with the following command. # ls -la /var/log/audit total 4512 drwx------. 2 root root 23 Apr 25 16:53 . drwxr-xr-x. 17 root root 4096 Aug 9 13:09 .. -rw-------. 1 root root 8675309 Aug 9 12:54 audit.log Audit logs must be mode 0600 or less permissive. If any are more permissive, this is a finding. The owner and group owner of all audit log files must both be "root". If any other owner or group owner is listed, this is a finding.
Fix: F-23603r419770_fix
Change the mode of the audit log files with the following command: # chmod 0600 [audit_file] Change the owner and group owner of the audit log files with the following command: # chown root:root [audit_file]
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-040711
- Vuln IDs
-
- V-233307
- Rule IDs
-
- SV-233307r991589_rule
Checks: C-36502r622233_chk
Verify the 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-36466r622234_fix
Configure the 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
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010341
- Vuln IDs
-
- V-237633
- Rule IDs
-
- SV-237633r991589_rule
Checks: C-40852r646848_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-40815r646849_fix
Remove the following entries from the sudoers file: ALL ALL=(ALL) ALL ALL ALL=(ALL:ALL) ALL
- RMF Control
- AC-6
- Severity
- Medium
- CCI
- CCI-002227
- Version
- RHEL-07-010342
- Vuln IDs
-
- V-237634
- Rule IDs
-
- SV-237634r991589_rule
Checks: C-40853r880753_chk
Verify that the sudoers security policy is configured to use the invoking user's password for privilege escalation. $ sudo grep -Eir '(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-40816r880754_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 Remove any configurations that conflict with the above from the following locations: /etc/sudoers /etc/sudoers.d/
- RMF Control
- IA-11
- Severity
- Medium
- CCI
- CCI-002038
- Version
- RHEL-07-010343
- Vuln IDs
-
- V-237635
- Rule IDs
-
- SV-237635r987879_rule
Checks: C-40854r858490_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-40817r858491_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". Remove any duplicate or conflicting lines from /etc/sudoers and /etc/sudoers.d/ files.
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-000213
- Version
- RHEL-07-010483
- Vuln IDs
-
- V-244557
- Rule IDs
-
- SV-244557r958472_rule
Checks: C-47832r792837_chk
For systems that use UEFI, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Verify that a unique name is set as the "superusers" account: # grep -iw "superusers" /boot/grub2/grub.cfg set superusers="[someuniquestringhere]" export superusers If "superusers" is identical to any OS account name or is missing a name, this is a finding.
Fix: F-47789r833184_fix
Configure the system to have a unique name for the grub superusers account. Edit the /etc/grub.d/01_users file and add or modify the following lines: set superusers="[someuniquestringhere]" export superusers password_pbkdf2 [someuniquestringhere] ${GRUB2_PASSWORD} Generate a new grub.cfg file with the following command: $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-000213
- Version
- RHEL-07-010492
- Vuln IDs
-
- V-244558
- Rule IDs
-
- SV-244558r958472_rule
Checks: C-47833r792839_chk
For systems that use BIOS, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Verify that a unique name is set as the "superusers" account: $ sudo grep -iw "superusers" /boot/efi/EFI/redhat/grub.cfg set superusers="[someuniquestringhere]" export superusers If "superusers" is identical to any OS account name or is missing a name, this is a finding.
Fix: F-47790r833186_fix
Configure the system to have a unique name for the grub superusers account. Edit the /etc/grub.d/01_users file and add or modify the following lines: set superusers="[someuniquestringhere]" export superusers password_pbkdf2 [someuniquestringhere] ${GRUB2_PASSWORD} Generate a new grub.cfg file with the following command: $ sudo grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020021
- Vuln IDs
-
- V-250312
- Rule IDs
-
- SV-250312r958726_rule
Checks: C-53746r928577_chk
Verify the operating system confines SELinux users to roles that conform to least privilege. Check the SELinux User list to SELinux Roles mapping by using the following command: $ sudo semanage user -l Labeling MLS/ MLS/ SELinux User Prefix MCS Level MCS Range SELinux Roles guest_u user s0 s0 guest_r root user s0 s0-s0:c0.c1023 staff_r sysadm_r system_r unconfined_r staff_u user s0 s0-s0:c0.c1023 staff_r sysadm_r system_r unconfined_r sysadm_u user s0 s0-s0:c0.c1023 sysadm_r system_u user s0 s0-s0:c0.c1023 system_r unconfined_r unconfined_u user s0 s0-s0:c0.c1023 system_r unconfined_r user_u user s0 s0 user_r xguest_u user s0 s0 xguest_r If the output differs from the above example, ask the system administrator (SA) to demonstrate how the SELinux User mappings are exercising least privilege. If deviations from the example are not documented with the information system security officer (ISSO) and do not demonstrate least privilege, this is a finding.
Fix: F-53700r928578_fix
Configure the operating system to confine SELinux users to roles that conform to least privilege. Use the following command to map the "staff_u" SELinux user to the "staff_r" and "sysadm_r" roles: $ sudo semanage user -m staff_u -R staff_r -R sysadm_r Use the following command to map the "user_u" SELinux user to the "user_r" role: $ sudo semanage -m user_u -R user_r
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020022
- Vuln IDs
-
- V-250313
- Rule IDs
-
- SV-250313r958726_rule
Checks: C-53747r942889_chk
Verify the operating system prevents privileged accounts from utilizing SSH. Check the SELinux ssh_sysadm_login boolean with the following command: $ sudo getsebool ssh_sysadm_login ssh_sysadm_login --> off If the "ssh_sysadm_login" boolean is not "off" and is not documented with the ISSO as an operational requirement, this is a finding.
Fix: F-53701r942890_fix
Configure the operating system to prevent privileged accounts from utilizing SSH. Use the following command to set the "ssh_sysadm_login" boolean to "off": $ sudo setsebool -P ssh_sysadm_login off Note: SELinux confined users mapped to sysadm_u are not allowed to login to the system over SSH, by default. If this is a required function, it can be configured by setting the ssh_sysadm_login SELinux boolean to "on" with the following command: $ sudo setsebool -P ssh_sysadm_login on This must be documented with the ISSO as an operational requirement.
- RMF Control
- AC-3
- Severity
- Medium
- CCI
- CCI-002165
- Version
- RHEL-07-020023
- Vuln IDs
-
- V-250314
- Rule IDs
-
- SV-250314r958726_rule
Checks: C-53748r928580_chk
Verify the operating system elevates the SELinux context when an administrator calls the sudo command with the following command: This command must be ran as root: # grep -r sysadm_r /etc/sudoers /etc/sudoers.d %{designated_group_or_user_name} ALL=(ALL) TYPE=sysadm_t ROLE=sysadm_r ALL If conflicting results are returned, this is a finding. If a designated sudoers administrator group or account(s) is not configured to elevate the SELinux type and role to "sysadm_t" and "sysadm_r" with the use of the sudo command, this is a finding.
Fix: F-53702r928581_fix
Configure the operating system to elevate the SELinux context when an administrator calls the sudo command. Edit a file in the "/etc/sudoers.d" directory with the following command: $ sudo visudo -f /etc/sudoers.d/<customfile> Use the following example to build the <customfile> in the /etc/sudoers.d directory to allow any administrator belonging to a designated sudoers admin group to elevate their SELinux context with the use of the sudo command: %{designated_group_or_user_name} ALL=(ALL) TYPE=sysadm_t ROLE=sysadm_r ALL Remove any configurations that conflict with the above from the following locations: /etc/sudoers /etc/sudoers.d/
- RMF Control
- CM-6
- Severity
- High
- CCI
- CCI-000366
- Version
- RHEL-07-010291
- Vuln IDs
-
- V-251702
- Rule IDs
-
- SV-251702r991589_rule
Checks: C-55139r809218_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-55093r809219_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]
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010339
- Vuln IDs
-
- V-251703
- Rule IDs
-
- SV-251703r991589_rule
Checks: C-55140r833182_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-55094r809222_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
- RMF Control
- IA-11
- Severity
- Medium
- CCI
- CCI-002038
- Version
- RHEL-07-010344
- Vuln IDs
-
- V-251704
- Rule IDs
-
- SV-251704r987879_rule
Checks: C-55141r809224_chk
Verify the operating system is not be 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" is returned from the command, this is a finding.
Fix: F-55095r854011_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.
- RMF Control
- SI-6
- Severity
- Medium
- CCI
- CCI-002696
- Version
- RHEL-07-020029
- Vuln IDs
-
- V-251705
- Rule IDs
-
- SV-251705r958944_rule
Checks: C-55142r880852_chk
Verify that Advanced Intrusion Detection Environment (AIDE) is installed and verifies the correct operation of all security functions. Check that the AIDE package is installed with the following command: $ sudo rpm -q aide aide-0.15.1-13.el7.x86_64 If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. If there is no application installed to perform integrity checks, this is a finding. If AIDE is installed, check if it has been initialized with the following command: $ sudo /usr/sbin/aide --check If the output is "Couldn't open file /var/lib/aide/aide.db.gz for reading", this is a finding.
Fix: F-55096r880853_fix
Install AIDE, initialize it, and perform a manual check. Install AIDE: $ sudo yum install aide Initialize it: $ sudo /usr/sbin/aide --init AIDE, version 0.15.1 ### AIDE database at /var/lib/aide/aide.db.new.gz initialized. The new database will need to be renamed to be read by AIDE: $ sudo mv /var/lib/aide/aide.db.new.gz /var/lib/aide/aide.db.gz Perform a manual check: $ sudo /usr/sbin/aide --check AIDE, version 0.15.1 ### All files match AIDE database. Looks okay! Done.
- RMF Control
- AC-2
- Severity
- Medium
- CCI
- CCI-001682
- Version
- RHEL-07-010271
- Vuln IDs
-
- V-254523
- Rule IDs
-
- SV-254523r958508_rule
Checks: C-58007r902691_chk
Verify temporary accounts have been provisioned with an expiration date of 72 hours. For every existing temporary account, run the following command to obtain its account expiration information: $ sudo chage -l <temporary_account_name> | grep -i "account expires" Verify each of these accounts has an expiration date set within 72 hours. If any temporary accounts have no expiration date set or do not expire within 72 hours, this is a finding.
Fix: F-57956r902692_fix
Configure the operating system to expire temporary accounts after 72 hours with the following command: $ sudo chage -E $(date -d +3days +%Y-%m-%d) <temporary_account_name>
- RMF Control
- AC-17
- Severity
- Medium
- CCI
- CCI-001453
- Version
- RHEL-07-040712
- Vuln IDs
-
- V-255925
- Rule IDs
-
- SV-255925r958408_rule
Checks: C-59602r880747_chk
Verify that the SSH server is configured to use only FIPS-validated key exchange algorithms: $ sudo grep -i kexalgorithms /etc/ssh/sshd_config KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256 If "KexAlgorithms" is not configured, is commented out, or does not contain only the algorithms "ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256" in exact order, this is a finding.
Fix: F-59545r880748_fix
Configure the SSH server to use only FIPS-validated key exchange algorithms by adding or modifying the following line in "/etc/ssh/sshd_config": KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256 Restart the "sshd" service for changes to take effect: $ sudo systemctl restart sshd
- RMF Control
- AC-11
- Severity
- Medium
- CCI
- CCI-000057
- Version
- RHEL-07-010090
- Vuln IDs
-
- V-255926
- Rule IDs
-
- SV-255926r958402_rule
Checks: C-59603r880777_chk
Verify the operating system has the screen package installed. Check to see if the screen package is installed with the following command: # yum list installed screen screen-4.3.1-3-x86_64.rpm If the screen package is not installed, check to see if the tmux package is installed with the following command: # yum list installed tmux tmux-1.8-4.el7.x86_64.rpm If either the screen package or the tmux package is not installed, this is a finding.
Fix: F-59546r880778_fix
Install the screen package to allow the initiation of a session lock after a 15-minute period of inactivity. Install the screen program (if it is not on the system) with the following command: # yum install screen OR Install the tmux program (if it is not on the system) with the following command: # yum install tmux
- RMF Control
- SC-4
- Severity
- Low
- CCI
- CCI-001090
- Version
- RHEL-07-010375
- Vuln IDs
-
- V-255927
- Rule IDs
-
- SV-255927r958524_rule
Checks: C-59604r880789_chk
Verify the operating system is configured to restrict access to the kernel message buffer with the following commands: $ sudo sysctl kernel.dmesg_restrict kernel.dmesg_restrict = 1 If "kernel.dmesg_restrict" is not set to "1" or is missing, this is a finding. Check that the configuration files are present to enable this kernel parameter: $ sudo grep -r kernel.dmesg_restrict /run/sysctl.d/* /etc/sysctl.d/* /usr/local/lib/sysctl.d/* /usr/lib/sysctl.d/* /lib/sysctl.d/* /etc/sysctl.conf 2> /dev/null /etc/sysctl.conf:kernel.dmesg_restrict = 1 /etc/sysctl.d/99-sysctl.conf:kernel.dmesg_restrict = 1 If "kernel.dmesg_restrict" is not set to "1", is missing or commented out, this is a finding. If conflicting results are returned, this is a finding.
Fix: F-59547r880790_fix
Configure the operating system to restrict access to the kernel message buffer. Set the system to the required kernel parameter by adding or modifying the following line in /etc/sysctl.conf or a config file in the /etc/sysctl.d/ directory: kernel.dmesg_restrict = 1 Remove any configurations that conflict with the above from the following locations: /run/sysctl.d/ /etc/sysctl.d/ /usr/local/lib/sysctl.d/ /usr/lib/sysctl.d/ /lib/sysctl.d/ /etc/sysctl.conf Reload settings from all system configuration files with the following command: $ sudo sysctl --system
- RMF Control
- IA-5
- Severity
- Medium
- CCI
- CCI-000196
- Version
- RHEL-07-010199
- Vuln IDs
-
- V-255928
- Rule IDs
-
- SV-255928r982199_rule
Checks: C-59605r880828_chk
Verify "system-auth" and "password-auth" files are symbolic links pointing to "system-auth-local" and "password-auth-local": $ sudo ls -l /etc/pam.d/{password,system}-auth lrwxrwxrwx. 1 root root 30 Apr 1 11:59 /etc/pam.d/password-auth -> /etc/pam.d/password-auth-local lrwxrwxrwx. 1 root root 28 Apr 1 11:59 /etc/pam.d/system-auth -> /etc/pam.d/system-auth-local If system-auth and password-auth files are not symbolic links, this is a finding. If system-auth and password-auth are symbolic links but do not point to "system-auth-local" and "password-auth-local", this is a finding.
Fix: F-59548r917837_fix
Create custom configuration files and their corresponding symbolic links: Rename the existing configuration files (skip this step if symbolic links are already present): $ sudo mv /etc/pam.d/system-auth /etc/pam.d/system-auth-ac $ sudo mv /etc/pam.d/password-auth /etc/pam.d/password-auth-ac Create custom system-auth configuration file: $ sudo vi /etc/pam.d/system-auth-local The new file, at minimum, must contain the following lines: auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth include system-auth-ac auth sufficient pam_unix.so try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so account include system-auth-ac password requisite pam_pwhistory.so remember=5 retry=3 password requisite pam_pwquality.so retry=3 password include system-auth-ac password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok session include system-auth-ac Create custom password-auth configuration file: $ sudo vi /etc/pam.d/password-auth-local The new file, at minimum, must contain the following lines: auth required pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth include password-auth-ac auth sufficient pam_unix.so try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 account required pam_faillock.so account include password-auth-ac password requisite pam_pwhistory.so use_authtok remember=5 retry=3 password requisite pam_pwquality.so retry=3 password include password-auth-ac password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok session include password-auth-ac Create new or move existing symbolic links to the new custom configuration files: $ sudo ln -sf /etc/pam.d/system-auth-local /etc/pam.d/system-auth $ sudo ln -sf /etc/pam.d/password-auth-local /etc/pam.d/password-auth Once finished, the following file structure should be present: $ sudo ls -1 /etc/pam.d/{password,system}-auth* /etc/pam.d/password-auth /etc/pam.d/password-auth-ac /etc/pam.d/password-auth-local /etc/pam.d/system-auth /etc/pam.d/system-auth-ac /etc/pam.d/system-auth-local Note: With this solution in place, any custom settings to "system-auth" and "password-auth" will be retained and not overwritten by the use of the authconfig utility. The authconfig utility will write its settings to "system-auth-ac" and "password-auth-ac" and continue to function as expected.
- RMF Control
- CM-5
- Severity
- Medium
- CCI
- CCI-001749
- Version
- RHEL-07-010019
- Vuln IDs
-
- V-256968
- Rule IDs
-
- SV-256968r982212_rule
Checks: C-60646r902685_chk
Confirm Red Hat package-signing keys are installed on the system and verify their fingerprints match vendor values. Note: For Red Hat Enterprise Linux 7 software packages, Red Hat uses GPG keys labeled "release key 2" and "auxiliary key". The keys are defined in key file "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release" by default. List Red Hat GPG keys installed on the system: $ sudo rpm -q --queryformat "%{SUMMARY}\n" gpg-pubkey | grep -i "red hat" gpg(Red Hat, Inc. (release key 2) <security@redhat.com>) gpg(Red Hat, Inc. (auxiliary key) <security@redhat.com>) If Red Hat GPG keys "release key 2" and "auxiliary key" are not installed, this is a finding. List key fingerprints of installed Red Hat GPG keys: $ sudo gpg -q --with-fingerprint /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release If key file "/etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release" is missing, this is a finding. Example output: pub 4096R/FD431D51 2009-10-22 Red Hat, Inc. (release key 2) <security@redhat.com> Key fingerprint = 567E 347A D004 4ADE 55BA 8A5F 199E 2F91 FD43 1D51 pub 1024D/2FA658E0 2006-12-01 Red Hat, Inc. (auxiliary key) <security@redhat.com> Key fingerprint = 43A6 E49C 4A38 F4BE 9ABF 2A53 4568 9C88 2FA6 58E0 Compare key fingerprints of installed Red Hat GPG keys with fingerprints listed on Red Hat "Product Signing Keys" webpage at https://access.redhat.com/security/team/key. If key fingerprints do not match, this is a finding.
Fix: F-60588r902686_fix
Install Red Hat package-signing keys on the system and verify their fingerprints match vendor values. Insert RHEL 7 installation disc or attach RHEL 7 installation image to the system. Mount the disc or image to make the contents accessible inside the system. Assuming the mounted location is "/media/cdrom", use the following command to copy Red Hat GPG key file onto the system: $ sudo cp /media/cdrom/RPM-GPG-KEY-redhat-release /etc/pki/rpm-gpg/ Import Red Hat GPG keys from key file into system keyring: $ sudo rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release Using the steps listed in the Check Text, confirm the newly imported keys show as installed on the system and verify their fingerprints match vendor values.
- RMF Control
- CM-6
- Severity
- Medium
- CCI
- CCI-000366
- Version
- RHEL-07-010063
- Vuln IDs
-
- V-256969
- Rule IDs
-
- SV-256969r991589_rule
Checks: C-60647r902688_chk
Verify that the operating system is configured to disable the login screen user list for graphical user interfaces. Note: If the system does not have the GNOME Desktop installed, this requirement is Not Applicable. Verify that the login screen user list for the GNOME Desktop is disabled with the following command: $ sudo grep -is disable-user-list /etc/dconf/db/gdm.d/* /etc/dconf/db/gdm.d/00-login-screen:disable-user-list=true If the variable "disable-user-list" is not defined in a file under "/etc/dconf/db/gdm.d/", is not set to "true", is missing or commented out, this is a finding.
Fix: F-60589r902689_fix
Configure the operating system to disable the login screen user list for graphical user interfaces. Create or edit the gdm profile in "/etc/dconf/profile/" to contain the following lines: $ sudo vi /etc/dconf/profile/gdm user-db:user system-db:gdm file-db:/usr/share/gdm/greeter-dconf-defaults Create or edit the gdm database for machine-wide settings in "/etc/dconf/db/gdm.d/" with the following lines: $ sudo vi /etc/dconf/db/gdm.d/00-login-screen [org/gnome/login-screen] disable-user-list=true Update the system databases by updating the dconf utility: $ sudo dconf update If the login screen user list persists after updating the system databases, you can restart the GNOME Desktop without rebooting the system: $ sudo systemctl restart gdm
- RMF Control
- CM-3
- Severity
- Medium
- CCI
- CCI-001744
- Version
- RHEL-07-020028
- Vuln IDs
-
- V-256970
- Rule IDs
-
- SV-256970r958794_rule
Checks: C-60648r902694_chk
Verify that the operating system is configured to allow sending email notifications. Note: The "mailx" package provides the "mail" command that is used to send email messages. Verify that the "mailx" package is installed on the system: $ sudo yum list installed mailx mailx.x86_64 12.5-19.el7 @rhel-7-server-rpms If "mailx" package is not installed, this is a finding.
Fix: F-60590r902695_fix
Install the "mailx" package on the system: $ sudo yum install mailx