Apple OS X 10.14 (Mojave) Security Technical Implementation Guide

Version

AOSX-14-000016

Vuln IDs

V-209535
V-95385

Rule IDs

SV-209535r507076_rule
SV-104711

Distinct user account databases on each separate system cause problems with username and password policy enforcement. Most approved directory services infrastructure solutions allow centralized management of users and passwords.

Checks: C-9786r282087_chk

If the system is using a mandatory Smart Card Policy, this is Not Applicable. To determine if the system is integrated to a directory service, ask the System Administrator (SA) or Information System Security Officer (ISSO) or run the following command: /usr/bin/sudo dscl localhost -list . | /usr/bin/grep -vE '(Contact | Search | Local)' If nothing is returned, or if the system is not integrated into a directory service infrastructure, this is a finding.

Fix: F-9786r282088_fix

Integrate the system into an existing directory services infrastructure.

b

The macOS system must enforce the limit of three consecutive invalid logon attempts by a user.

AC-7 - Medium - CCI-000044 - V-209536 - SV-209536r507076_rule

RMF Control

AC-7

Severity

M

CCI

CCI-000044

Version

AOSX-14-000020

Vuln IDs

V-209536
V-95813

Rule IDs

SV-209536r507076_rule
SV-104951

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute forcing, is reduced. Limits are imposed by locking the account.

Checks: C-9787r282090_chk

The password policy is set with a configuration profile. Run the following command to check if the system has the correct setting for the number of permitted failed logon attempts: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep maxFailedAttempts If the return is null, or not, “maxFailedAttempts = 3”, this is a finding.

Fix: F-9787r282091_fix

This setting is enforced using the “Passcode Policy" configuration profile.

b

The macOS system must enforce an account lockout time period of 15 minutes in which a user makes three consecutive invalid logon attempts.

AC-7 - Medium - CCI-002238 - V-209537 - SV-209537r507076_rule

RMF Control

AC-7

Severity

M

CCI

CCI-002238

Version

AOSX-14-000021

Vuln IDs

V-209537
V-95815

Rule IDs

SV-209537r507076_rule
SV-104953

Setting a lockout time period of 15 minutes is an effective deterrent against brute forcing that also makes allowances for legitimate mistakes by users. When three invalid logon attempts are made, the account will be locked.

Checks: C-9788r466297_chk

Password policy can be set with a configuration profile or the "pwpolicy" utility. If password policy is set with a configuration profile, run the following command to check if the system has the correct setting for the logon reset timer: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep minutesUntilFailedLoginReset If the return is null or not "minutesUntilFailedLoginReset = 15", this is a finding. If password policy is set with the "pwpolicy" utility, the variable names may vary depending on how the policy was set. To check if the password policy is configured to disable an account for 15 minutes after 3 unsuccessful logon attempts, run the following command to output the password policy to the screen: /usr/bin/sudo /usr/bin/pwpolicy getaccountpolicies Look for the line "<key>policyCategoryAuthentication</key>". If this does not exist, and password policy is not controlled by a directory service, this is a finding. In the array that follows, there should be one or more <dict> sections that describe policy checks. One should contain a <string> that allows users to log on if "policyAttributeFailedAuthentications" is less than "policyAttributeMaximumFailedAuthentications". Under policyParameters, "policyAttributeMaximumFailedAuthentications" should be set to "3". If "policyAttributeMaximumFailedAuthentications" is not set to "3", this is a finding. In the same check or in another <dict> section, there should be a <string> that allows users to log on if the "policyAttributeCurrentTime" is greater than the result of adding "15" minutes (900 seconds) to "policyAttributeLastFailedAuthenticationTime". The check might use a variable defined in its "policyParameters" section. If the check does not exist or if the check adds too great an amount of time, this is a finding.

Fix: F-9788r466298_fix

This setting may be enforced using the "Passcode Policy" configuration profile or by a directory service. The following two lines within the configuration enforce lockout expiration to "15" minutes: <key>autoEnableInSeconds</key> <integer>900</integer> To set the passcode policy without a configuration profile, run the following command to save a copy of the current "pwpolicy" account policy file: /usr/bin/sudo /usr/bin/pwpolicy getaccountpolicies | tail -n +2 > pwpolicy.plist Open the generated file in a text editor and ensure it contains the following text after the opening <dict> tag and before the closing </dict> tag. Replace <dict/> first with <dict></dict> if necessary. <key>policyCategoryAuthentication</key> <array> <dict> <key>policyContent</key> <string>(policyAttributeFailedAuthentications < policyAttributeMaximumFailedAuthentications) OR (policyAttributeCurrentTime > (policyAttributeLastFailedAuthenticationTime + autoEnableInSeconds))</string> <key>policyIdentifier</key> <string>Authentication Lockout</string> <key>policyParameters</key> <dict> <key>autoEnableInSeconds</key> <integer>900</integer> <key>policyAttributeMaximumFailedAuthentications</key> <integer>3</integer> </dict> </dict> </array> If the line "<key>policyCategoryAuthentication</key>" already exists, the following text should be used instead and inserted after the first <array> tag that follows it: <dict> <key>policyContent</key> <string>(policyAttributeFailedAuthentications < policyAttributeMaximumFailedAuthentications) OR (policyAttributeCurrentTime > (policyAttributeLastFailedAuthenticationTime + autoEnableInSeconds))</string> <key>policyIdentifier</key> <string>Authentication Lockout</string> <key>policyParameters</key> <dict> <key>autoEnableInSeconds</key> <integer>900</integer> <key>policyAttributeMaximumFailedAuthentications</key> <integer>3</integer> </dict> </dict> After saving the file and exiting to the command prompt, run the following command to load the new policy file: /usr/bin/sudo /usr/bin/pwpolicy setaccountpolicies pwpolicy.plist Note: Updates to passcode restrictions must be thoroughly evaluated in a test environment. Mistakes in configuration may block password change and local user creation operations, as well as lock out all local users, including administrators.

b

The macOS system must enforce the limit of three consecutive invalid logon attempts by a user before the user account is locked.

AC-7 - Medium - CCI-002238 - V-209538 - SV-209538r507076_rule

RMF Control

AC-7

Severity

M

CCI

CCI-002238

Version

AOSX-14-000022

Vuln IDs

V-209538
V-95393

Rule IDs

SV-209538r507076_rule
SV-104713

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute forcing, is reduced. Limits are imposed by locking the account.

Checks: C-9789r282096_chk

Password policy can be set with a configuration profile or the "pwpolicy" utility. If password policy is set with a configuration profile, run the following command to check if the system has the correct setting for the number of permitted failed logon attempts and the logon reset timer: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep 'maxFailedAttempts\|minutesUntilFailedLoginReset' If "maxFailedAttempts" is not set to "3" and "minutesUntilFailedLoginReset" is not set to "15", this is a finding. If password policy is set with the "pwpolicy" utility, the variable names may vary depending on how the policy was set. To check if the password policy is configured to disable an account for 15 minutes after 3 unsuccessful logon attempts, run the following command to output the password policy to the screen: /usr/bin/sudo /usr/bin/pwpolicy getaccountpolicies Look for the line "<key>policyCategoryAuthentication</key>". If this does not exist, and password policy is not controlled by a directory service, this is a finding. In the array that follows, there should be one or more <dict> sections that describe policy checks. One should contain a <string> that allows users to log on if "policyAttributeFailedAuthentications" is less than "policyAttributeMaximumFailedAuthentications". Under policyParameters, "policyAttributeMaximumFailedAuthentications" should be set to "3". If "policyAttributeMaximumFailedAuthentications" is not set to "3", this is a finding. In the same check or in another <dict> section, there should be a <string> that allows users to log on if the "policyAttributeCurrentTime" is greater than the result of adding "15" minutes (900 seconds) to "policyAttributeLastFailedAuthenticationTime". The check might use a variable defined in its "policyParameters" section. If the check does not exist or if the check adds too great an amount of time, this is a finding.

Fix: F-9789r466345_fix

This setting may be enforced using the "Passcode Policy" configuration profile or by a directory service. To set the passcode policy without a configuration profile, run the following command to save a copy of the current "pwpolicy" account policy file: /usr/bin/sudo /usr/bin/pwpolicy getaccountpolicies | tail -n +2 > pwpolicy.plist Open the generated file in a text editor and ensure it contains the following text after the opening <dict> tag and before the closing </dict> tag. Replace <dict/> first with <dict></dict> if necessary. <key>policyCategoryAuthentication</key> <array> <dict> <key>policyContent</key> <string>(policyAttributeFailedAuthentications < policyAttributeMaximumFailedAuthentications) OR (policyAttributeCurrentTime > (policyAttributeLastFailedAuthenticationTime + autoEnableInSeconds))</string> <key>policyIdentifier</key> <string>Authentication Lockout</string> <key>policyParameters</key> <dict> <key>autoEnableInSeconds</key> <integer>900</integer> <key>policyAttributeMaximumFailedAuthentications</key> <integer>3</integer> </dict> </dict> </array> If the line "<key>policyCategoryAuthentication</key>" already exists, the following text should be used instead and inserted after the first <array> tag that follows it: <dict> <key>policyContent</key> <string>(policyAttributeFailedAuthentications < policyAttributeMaximumFailedAuthentications) OR (policyAttributeCurrentTime > (policyAttributeLastFailedAuthenticationTime + autoEnableInSeconds))</string> <key>policyIdentifier</key> <string>Authentication Lockout</string> <key>policyParameters</key> <dict> <key>autoEnableInSeconds</key> <integer>900</integer> <key>policyAttributeMaximumFailedAuthentications</key> <integer>3</integer> </dict> </dict> After saving the file and exiting to the command prompt, run the following command to load the new policy file: /usr/bin/sudo /usr/bin/pwpolicy setaccountpolicies pwpolicy.plist Note: Updates to passcode restrictions must be thoroughly evaluated in a test environment. Mistakes in configuration or bugs in OS X may block password change and local user creation operations, as well as lock out all local users, including administrators.

b

The macOS system must display the Standard Mandatory DoD Notice and Consent Banner before granting remote access to the operating system.

AC-8 - Medium - CCI-000048 - V-209539 - SV-209539r507076_rule

RMF Control

AC-8

Severity

M

CCI

CCI-000048

Version

AOSX-14-000023

Vuln IDs

V-209539
V-95817

Rule IDs

SV-209539r507076_rule
SV-104955

Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with DTM-08-060.

Checks: C-9790r282099_chk

Verify the operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the operating system. Check to see if the operating system has the correct text listed in the "/etc/banner" file with the following command: # more /etc/banner 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/banner" file does not match the Standard Mandatory DoD Notice and Consent Banner, this is a finding.

Fix: F-9790r282100_fix

Create a text file containing the required DoD text. Name the file "banner" and place it in "/etc/".

b

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

AC-8 - Medium - CCI-000048 - V-209540 - SV-209540r507076_rule

RMF Control

AC-8

Severity

M

CCI

CCI-000048

Version

AOSX-14-000024

Vuln IDs

V-209540
V-95819

Rule IDs

SV-209540r507076_rule
SV-104957

Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with DTM-08-060. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007

Checks: C-9791r282102_chk

For systems that allow remote access through SSH, run the following command to verify that "/etc/banner" is displayed before granting access: # /usr/bin/grep Banner /etc/ssh/sshd_config If the sshd Banner configuration option does not point to "/etc/banner", this is a finding.

Fix: F-9791r282103_fix

For systems that allow remote access through SSH, modify the "/etc/ssh/sshd_config" file to add or update the following line: Banner /etc/banner

b

The macOS system must be configured so that any connection to the system must display the Standard Mandatory DoD Notice and Consent Banner before granting GUI access to the system.

AC-8 - Medium - CCI-000048 - V-209541 - SV-209541r507076_rule

RMF Control

AC-8

Severity

M

CCI

CCI-000048

Version

AOSX-14-000025

Vuln IDs

V-209541
V-95821

Rule IDs

SV-209541r507076_rule
SV-104959

Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with DTM-08-060. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088

Checks: C-9792r282105_chk

The policy banner will show if a "PolicyBanner.rtf" or "PolicyBanner.rtfd" exists in the "/Library/Security" folder. Run this command to show the contents of that folder: /bin/ls -l /Library/Security/PolicyBanner.rtf* If neither "PolicyBanner.rtf" nor "PolicyBanner.rtfd" exists, this is a finding. The banner text of the document MUST read: "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 text is not worded exactly this way, this is a finding.

Fix: F-9792r282106_fix

Create an RTF file containing the required text. Name the file "PolicyBanner.rtf" or "PolicyBanner.rtfd" and place it in "/Library/Security/".

b

The macOS system must be configured so that log files must not contain access control lists (ACLs).

SI-11 - Medium - CCI-001314 - V-209542 - SV-209542r507076_rule

RMF Control

SI-11

Severity

M

CCI

CCI-001314

Version

AOSX-14-000030

Vuln IDs

V-209542
V-95823

Rule IDs

SV-209542r507076_rule
SV-104961

The audit service must be configured to create log files with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000206-GPOS-00084

Checks: C-9793r282108_chk

To check if a log file contains ACLs, run the following commands: /usr/bin/sudo ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') | /usr/bin/grep -v current In the output from the above commands, ACLs will be listed under any file that may contain them (e.g., "0: group:admin allow list,readattr,reaadextattr,readsecurity"). If any such line exists, this is a finding.

Fix: F-9793r282109_fix

For any log file that contains ACLs, run the following command: /usr/bin/sudo chmod -N [audit log file]

b

The macOS system must be configured so that log folders must not contain access control lists (ACLs).

AU-9 - Medium - CCI-000162 - V-209543 - SV-209543r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-000031

Vuln IDs

V-209543
V-95825

Rule IDs

SV-209543r507076_rule
SV-104963

The audit service must be configured to create log folders with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and users. If log folders are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

Checks: C-9794r282111_chk

To check if a log folder contains ACLs, run the following commands: /usr/bin/sudo ls -lde $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') In the output from the above commands, ACLs will be listed under any folder that may contain them (e.g., "0: group:admin allow list,readattr,reaadextattr,readsecurity"). If any such line exists, this is a finding.

Fix: F-9794r282112_fix

For any log folder that contains ACLs, run the following command: /usr/bin/sudo chmod -N [audit log folder]

b

The macOS system must use replay-resistant authentication mechanisms and implement cryptographic mechanisms to protect the integrity of and verify remote disconnection at the termination of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.

IA-2 - Medium - CCI-001941 - V-209544 - SV-209544r507076_rule

RMF Control

IA-2

Severity

M

CCI

CCI-001941

Version

AOSX-14-000040

Vuln IDs

V-209544
V-95405

Rule IDs

SV-209544r507076_rule
SV-104715

Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms, such as a hash function or digital signature, to protect integrity. Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. The operating system can meet this requirement through leveraging a cryptographic module. This requirement does not cover hardware/software components that may support information system maintenance, yet are a part of the system (e.g., the software implementing "ping," "ls," "ipconfig," or the hardware and software implementing the monitoring port of an Ethernet switch). Satisfies: SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Checks: C-9795r466312_chk

To verify that the installed version of SSH is correct, run the following command: ssh -V If the string that is returned does not include "OpenSSH_7.9p1" or greater, this is a finding. To check if the "SSHD" service is enabled, use the following commands: /usr/bin/sudo launchctl print-disabled system | grep sshd If the results do not show "com.openssh.sshd => false", this is a finding. To check that "SSHD" is currently running, use the following command: /usr/bin/sudo launchctl print system/com.openssh.sshd If the result is the following, "Could not find service "com.openssh.sshd" in domain for system", this is a finding.

Fix: F-9795r466313_fix

To update SSHD to the minimum required version, run Software Update to update to the latest version of macOS. To enable the SSHD service, run the following command: /usr/bin/sudo /bin/launchctl enable system/com.openssh.sshd The system may need to be restarted for the update to take effect.

b

The macOS system must limit the number of concurrent SSH sessions to 10 for all accounts and/or account types.

AC-10 - Medium - CCI-000054 - V-209545 - SV-209545r507076_rule

RMF Control

AC-10

Severity

M

CCI

CCI-000054

Version

AOSX-14-000050

Vuln IDs

V-209545
V-95407

Rule IDs

SV-209545r507076_rule
SV-104717

Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system.

Checks: C-9796r282117_chk

To verify that SSHD is limited to 10 sessions, use the following command: /bin/cat /etc/ssh/sshd_config | grep MaxSessions The command must return "MaxSessions 10". If it returns null, or a commented value, or the value is greater than "10", this is a finding.

Fix: F-9796r282118_fix

To configure SSHD to limit the number of sessions, use the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*MaxSessions.*/MaxSessions 10/' /etc/ssh/sshd_config

b

The macOS system must be configured with the SSH daemon ClientAliveInterval option set to 900 or less.

SC-10 - Medium - CCI-001133 - V-209546 - SV-209546r507076_rule

RMF Control

SC-10

Severity

M

CCI

CCI-001133

Version

AOSX-14-000051

Vuln IDs

V-209546
V-95827

Rule IDs

SV-209546r507076_rule
SV-104965

SSH should be configured to log users out after a 15-minute interval of inactivity and to wait only 30 seconds before timing out logon attempts. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session or an incomplete logon attempt will also free up resources committed by the managed network element.

Checks: C-9797r282120_chk

The SSH daemon "ClientAliveInterval" option must be set correctly. To check the idle timeout setting for SSH sessions, run the following: /usr/bin/sudo /usr/bin/grep ^ClientAliveInterval /etc/ssh/sshd_config If the setting is not "900" or less, this is a finding.

Fix: F-9797r282121_fix

To ensure that "ClientAliveInterval" is set correctly, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/.*ClientAliveInterval.*/ClientAliveInterval 900/' /etc/ssh/sshd_config

b

The macOS system must be configured with the SSH daemon ClientAliveCountMax option set to 0.

SC-10 - Medium - CCI-001133 - V-209547 - SV-209547r507076_rule

RMF Control

SC-10

Severity

M

CCI

CCI-001133

Version

AOSX-14-000052

Vuln IDs

V-209547
V-95829

Rule IDs

SV-209547r507076_rule
SV-104967

SSH should be configured with an Active Client Alive Maximum Count of 0. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session or an incomplete logon attempt will also free up resources committed by the managed network element.

Checks: C-9798r282123_chk

The SSH daemon "ClientAliveCountMax" option must be set correctly. To verify the SSH idle timeout will occur when the "ClientAliveCountMax" is set, run the following command: /usr/bin/sudo /usr/bin/grep ^ClientAliveCountMax /etc/ssh/sshd_config If the setting is not "ClientAliveCountMax 0", this is a finding.

Fix: F-9798r282124_fix

To ensure that the SSH idle timeout occurs precisely when the "ClientAliveCountMax" is set, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/.*ClientAliveCountMax.*/ClientAliveCountMax 0/' /etc/ssh/sshd_config

b

The macOS system must be configured with the SSH daemon LoginGraceTime set to 30 or less.

SC-10 - Medium - CCI-001133 - V-209548 - SV-209548r507076_rule

RMF Control

SC-10

Severity

M

CCI

CCI-001133

Version

AOSX-14-000053

Vuln IDs

V-209548
V-95831

Rule IDs

SV-209548r507076_rule
SV-104969

SSH should be configured to log users out after a 15-minute interval of inactivity and to wait only 30 seconds before timing out logon attempts. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session or an incomplete logon attempt will also free up resources committed by the managed network element.

Checks: C-9799r282126_chk

The SSH daemon "LoginGraceTime" must be set correctly. To check the amount of time that a user can log on through SSH, run the following command: /usr/bin/sudo /usr/bin/grep ^LoginGraceTime /etc/ssh/sshd_config If the value is not set to "30" or less, this is a finding.

Fix: F-9799r282127_fix

To ensure that "LoginGraceTime" is configured correctly, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/.*LoginGraceTime.*/LoginGraceTime 30/' /etc/ssh/sshd_config

b

The macOS system must generate audit records for all account creations, modifications, disabling, and termination events; privileged activities or other system-level access; all kernel module load, unload, and restart actions; all program initiations; and organizationally defined events for all non-local maintenance and diagnostic sessions.

AC-2 - Medium - CCI-001403 - V-209549 - SV-209549r507076_rule

RMF Control

AC-2

Severity

M

CCI

CCI-001403

Version

AOSX-14-001001

Vuln IDs

V-209549
V-95833

Rule IDs

SV-209549r507076_rule
SV-104971

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). If events associated with nonlocal administrative access or diagnostic sessions are not logged, a major tool for assessing and investigating attacks would not be available. This requirement addresses auditing-related issues associated with maintenance tools used specifically for diagnostic and repair actions on organizational information systems. Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection. This requirement applies to hardware/software diagnostic test equipment or tools. This requirement does not cover hardware/software components that may support information system maintenance, yet are a part of the system, for example, the software implementing "ping," "ls," "ipconfig," or the hardware and software implementing the monitoring port of an Ethernet switch. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000327-GPOS-00127, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215, SRG-OS-000471-GPOS-00216, SRG-OS-000476-GPOS-00221, SRG-OS-000477-GPOS-00222

Checks: C-9800r466255_chk

To view the currently configured flags for the audit daemon, run the following command: /usr/bin/sudo /usr/bin/grep ^flags /etc/security/audit_control Administrative and Privileged access, including administrative use of the command line tools "kextload" and "kextunload" and changes to configuration settings are logged by way of the "ad" flag. If "ad" is not listed in the result of the check, this is a finding.

Fix: F-9800r466256_fix

To ensure the appropriate flags are enabled for auditing, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak '/^flags/ s/$/,ad/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control" file.

b

The macOS system must monitor remote access methods and generate audit records when successful/unsuccessful attempts to access/modify privileges occur.

AU-12 - Medium - CCI-000172 - V-209550 - SV-209550r507076_rule

RMF Control

AU-12

Severity

M

CCI

CCI-000172

Version

AOSX-14-001002

Vuln IDs

V-209550
V-95835

Rule IDs

SV-209550r507076_rule
SV-104973

Frequently, an attacker that successfully gains access to a system has only gained access to an account with limited privileges, such as a guest account or a service account. The attacker must attempt to change to another user account with normal or elevated privileges in order to proceed. Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000032-GPOS-00013, SRG-OS-000462-GPOS-00206

Checks: C-9801r466258_chk

To view the currently configured flags for the audit daemon, run the following command: /usr/bin/sudo /usr/bin/grep ^flags /etc/security/audit_control Attempts to log in as another user are logged by way of the "lo" flag. If "lo" is not listed in the result of the check, this is a finding.

Fix: F-9801r466259_fix

To ensure the appropriate flags are enabled for auditing, run the following command: /usr/bin/sudo sed -i.bak '/^flags/ s/$/,lo/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control" file.

b

The macOS system must initiate session audits at system startup, using internal clocks with time stamps for audit records that meet a minimum granularity of one second and can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT), in order to generate audit records containing information to establish what type of events occurred, the identity of any individual or process associated with the event, including individual identities of group account users, establish where the events occurred, source of the event, and outcome of the events including all account enabling actions, full-text recording of privileged commands, and information about the use of encryption for access wireless access to and from the system.

AU-3 - Medium - CCI-000130 - V-209551 - SV-209551r507076_rule

RMF Control

AU-3

Severity

M

CCI

CCI-000130

Version

AOSX-14-001003

Vuln IDs

V-209551
V-95837

Rule IDs

SV-209551r507076_rule
SV-104975

Without establishing what type of events occurred, when they occurred, and by whom it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked. Associating event types with detected events in the operating system audit logs provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured operating system. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000038-GPOS-00016, SRG-OS-000039-GPOS-00017, SRG-OS-000040-GPOS-00018, SRG-OS-000041-GPOS-00019, SRG-OS-000042-GPOS-00020, SRG-OS-000042-GPOS-00021, SRG-OS-000055-GPOS-00026, SRG-OS-000254-GPOS-00095, SRG-OS-000255-GPOS-00096, SRG-OS-000303-GPOS-00120, SRG-OS-000337-GPOS-00129, SRG-OS-000358-GPOS-00145, SRG-OS-000359-GPOS-00146

Checks: C-9802r466261_chk

To check if the audit service is running, use the following command: launchctl print-disabled system| grep auditd If the return is not: "com.apple.auditd" => false" the audit service is disabled, and this is a finding.

Fix: F-9802r466262_fix

To enable the audit service, run the following command: /usr/bin/sudo /bin/launchctl enable system/com.apple.auditd The system may need to be restarted for the update to take effect.

b

The macOS system must shut down by default upon audit failure (unless availability is an overriding concern).

AU-5 - Medium - CCI-000140 - V-209552 - SV-209552r507076_rule

RMF Control

AU-5

Severity

M

CCI

CCI-000140

Version

AOSX-14-001010

Vuln IDs

V-209552
V-95839

Rule IDs

SV-209552r507076_rule
SV-104977

The audit service should shut down the computer if it is unable to audit system events. Once audit failure occurs, user and system activity is no longer recorded and malicious activity could go undetected. Audit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. Responses to audit failure depend on the nature of the failure mode. When availability is an overriding concern, other approved actions in response to an audit failure are as follows: (i) If the failure was caused by the lack of audit record storage capacity, the operating system must continue generating audit records if possible (automatically restarting the audit service if necessary), overwriting the oldest audit records in a first-in-first-out manner. (ii) If audit records are sent to a centralized collection server and communication with this server is lost or the server fails, the operating system must queue audit records locally until communication is restored or until the audit records are retrieved manually. Upon restoration of the connection to the centralized collection server, action should be taken to synchronize the local audit data with the collection server.

Checks: C-9803r466264_chk

To view the setting for the audit control system, run the following command: sudo /usr/bin/grep ^policy /etc/security/audit_control | /usr/bin/grep ahlt If there is no result, this is a finding.

Fix: F-9803r466265_fix

Edit the "/etc/security/audit_control file" and change the value for policy to include the setting "ahlt". To do this programmatically, run the following command: sudo /usr/bin/sed -i.bak '/^policy/ s/$/,ahlt/' /etc/security/audit_control; sudo /usr/sbin/audit -s

b

The macOS system must be configured with audit log files owned by root.

AU-9 - Medium - CCI-000162 - V-209553 - SV-209553r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001012

Vuln IDs

V-209553
V-95841

Rule IDs

SV-209553r507076_rule
SV-104979

The audit service must be configured to create log files with the correct ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.

Checks: C-9804r282141_chk

To check the ownership of the audit log files, run the following command: /usr/bin/sudo ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') | grep -v current The results should show the owner (third column) to be "root". If they do not, this is a finding.

Fix: F-9804r282142_fix

For any log file that returns an incorrect owner, run the following command: /usr/bin/sudo chown root [audit log file] [audit log file] is the full path to the log file in question.

b

The macOS system must be configured with audit log folders owned by root.

AU-9 - Medium - CCI-000162 - V-209554 - SV-209554r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001013

Vuln IDs

V-209554
V-95843

Rule IDs

SV-209554r507076_rule
SV-104981

The audit service must be configured to create log files with the correct ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

Checks: C-9805r282144_chk

To check the ownership of the audit log folder, run the following command: /usr/bin/sudo ls -lde $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') The results should show the owner (third column) to be "root". If it does not, this is a finding.

Fix: F-9805r282145_fix

For any log folder that has an incorrect owner, run the following command: /usr/bin/sudo chown root [audit log folder]

b

The macOS system must be configured with audit log files group-owned by wheel.

AU-9 - Medium - CCI-000162 - V-209555 - SV-209555r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001014

Vuln IDs

V-209555
V-95845

Rule IDs

SV-209555r507076_rule
SV-104983

The audit service must be configured to create log files with the correct group ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

Checks: C-9806r282147_chk

To check the group ownership of the audit log files, run the following command: /usr/bin/sudo ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') | /usr/bin/grep -v current The results should show the group owner (fourth column) to be "wheel". If they do not, this is a finding.

Fix: F-9806r282148_fix

For any log file that returns an incorrect group owner, run the following command: /usr/bin/sudo chgrp wheel [audit log file] [audit log file] is the full path to the log file in question.

b

The macOS system must be configured with audit log folders group-owned by wheel.

AU-9 - Medium - CCI-000162 - V-209556 - SV-209556r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001015

Vuln IDs

V-209556
V-95847

Rule IDs

SV-209556r507076_rule
SV-104985

The audit service must be configured to create log files with the correct group ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

Checks: C-9807r282150_chk

To check the group ownership of the audit log folder, run the following command: /usr/bin/sudo ls -lde $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') The results should show the group (fourth column) to be "wheel". If they do not, this is a finding.

Fix: F-9807r282151_fix

For any log folder that has an incorrect group, run the following command: /usr/bin/sudo chgrp wheel [audit log folder]

b

The macOS system must be configured with audit log files set to mode 440 or less permissive.

AU-9 - Medium - CCI-000162 - V-209557 - SV-209557r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001016

Vuln IDs

V-209557
V-95849

Rule IDs

SV-209557r507076_rule
SV-104987

The audit service must be configured to create log files with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

Checks: C-9808r282153_chk

To check the permissions of the audit log files, run the following command: /usr/bin/sudo ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') | /usr/bin/grep -v current The results should show the permissions (first column) to be "440" or less permissive. If they do not, this is a finding.

Fix: F-9808r282154_fix

For any log file that returns an incorrect permission value, run the following command: /usr/bin/sudo chmod 440 [audit log file] [audit log file] is the full path to the log file in question.

b

The macOS system must be configured with audit log folders set to mode 700 or less permissive.

AU-9 - Medium - CCI-000162 - V-209558 - SV-209558r507076_rule

RMF Control

AU-9

Severity

M

CCI

Version

AOSX-14-001017

Vuln IDs

V-209558
V-95851

Rule IDs

SV-209558r507076_rule
SV-104989

The audit service must be configured to create log folders with the correct permissions to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and users. If log folders are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Checks: C-9809r282156_chk

To check the permissions of the audit log folder, run the following command: /usr/bin/sudo ls -lde $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') The results should show the permissions (first column) to be "700" or less permissive. if they do not, this is a finding.

Fix: F-9809r282157_fix

For any log folder that returns an incorrect permission value, run the following command: /usr/bin/sudo chmod 700 [audit log folder]

b

The macOS system must audit the enforcement actions used to restrict access associated with changes to the system.

AU-12 - Medium - CCI-000172 - V-209559 - SV-209559r507076_rule

RMF Control

AU-12

Severity

M

CCI

CCI-000172

Version

AOSX-14-001020

Vuln IDs

V-209559
V-95853

Rule IDs

SV-209559r507076_rule
SV-104991

By auditing access restriction enforcement, changes to application and OS configuration files can be audited. Without auditing the enforcement of access restrictions, it will be difficult to identify attempted attacks and an audit trail will not be available for forensic investigation. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact. Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000365-GPOS-00152, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209, SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00211, SRG-OS-000468-GPOS-00212, SRG-OS-000474-GPOS-00219

Checks: C-9810r466267_chk

To view the currently configured flags for the audit daemon, run the following command: /usr/bin/sudo /usr/bin/grep ^flags /etc/security/audit_control Enforcement actions are logged by way of the "fm" flag, which audits permission changes, and "-fr" and "-fw", which denote failed attempts to read or write to a file. If "fm", "-fr", and "-fw" are not listed in the result of the check, this is a finding.

Fix: F-9810r466268_fix

To set the audit flags to the recommended setting, run the following command to add the flags "fm", "-fr", and "-fw" all at once: /usr/bin/sudo /usr/bin/sed -i.bak '/^flags/ s/$/,fm,-fr,-fw/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control" file.

b

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

AU-4 - Medium - CCI-001849 - V-209560 - SV-209560r507076_rule

RMF Control

AU-4

Severity

M

CCI

CCI-001849

Version

AOSX-14-001029

Vuln IDs

V-209560
V-95437

Rule IDs

SV-209560r507076_rule
SV-104719

The audit service must be configured to require that records are kept for seven days or longer before deletion when there is no central audit record storage facility. When "expire-after" is set to "7d", the audit service will not delete audit logs until the log data is at least seven days old.

Checks: C-9811r466300_chk

The check displays the amount of time the audit system is configured to retain audit log files. The audit system will not delete logs until the specified condition has been met. To view the current setting, run the following command: /usr/bin/sudo /usr/bin/grep ^expire-after /etc/security/audit_control If this returns no results, or does not contain "7d" or a larger value, this is a finding.

Fix: F-9811r466301_fix

Edit the "/etc/security/audit_control" file and change the value for "expire-after" to the amount of time audit logs should be kept for the system. Use the following command to set the "expire-after" value to "7d": /usr/bin/sudo /usr/bin/sed -i.bak 's/.*expire-after.*/expire-after:7d/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control" file.

b

The macOS system must provide an immediate warning to the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 75 percent of repository maximum audit record storage capacity.

AU-5 - Medium - CCI-001855 - V-209561 - SV-209561r507076_rule

RMF Control

AU-5

Severity

M

CCI

CCI-001855

Version

AOSX-14-001030

Vuln IDs

V-209561
V-95855

Rule IDs

SV-209561r507076_rule
SV-104993

The audit service must be configured to require a minimum percentage of free disk space in order to run. This ensures that audit will notify the administrator that action is required to free up more disk space for audit logs. When "minfree" is set to 25 percent, security personnel are notified immediately when the storage volume is 75 percent full and are able to plan for audit record storage capacity expansion.

Checks: C-9812r466303_chk

The check displays the "% free" to leave available for the system. The audit system will not write logs if the volume has less than this percentage of free disk space. To view the current setting, run the following command: /usr/bin/sudo /usr/bin/grep ^minfree /etc/security/audit_control If this returns no results, or does not contain "25", this is a finding.

Fix: F-9812r466304_fix

Edit the "/etc/security/audit_control" file and change the value for "minfree" to "25" using the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/.*minfree.*/minfree:25/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control file".

b

The macOS system must provide an immediate real-time alert to the System Administrator (SA) and Information System Security Officer (ISSO), at a minimum, of all audit failure events requiring real-time alerts.

AU-5 - Medium - CCI-001858 - V-209562 - SV-209562r507076_rule

RMF Control

AU-5

Severity

M

CCI

CCI-001858

Version

AOSX-14-001031

Vuln IDs

V-209562
V-95857

Rule IDs

SV-209562r507076_rule
SV-104995

The audit service should be configured to immediately print messages to the console or email administrator users when an auditing failure occurs. It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impending failure of the audit capability and system operation may be adversely affected.

Checks: C-9813r282168_chk

By default, "auditd" only logs errors to "syslog". To see if audit has been configured to print error messages to the console, run the following command: /usr/bin/sudo /usr/bin/grep logger /etc/security/audit_warn If the argument "-s" is missing, or if "audit_warn" has not been otherwise modified to print errors to the console or send email alerts to the SA and ISSO, this is a finding.

Fix: F-9813r282169_fix

To make "auditd" log errors to standard error as well as "syslogd", run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/logger -p/logger -s -p/' /etc/security/audit_warn; /usr/bin/sudo /usr/sbin/audit -s

b

The macOS system must generate audit records for DoD-defined events such as successful/unsuccessful logon attempts, successful/unsuccessful direct access attempts, starting and ending time for user access, and concurrent logons to the same account from different sources.

AU-12 - Medium - CCI-000172 - V-209563 - SV-209563r507076_rule

RMF Control

AU-12

Severity

M

CCI

CCI-000172

Version

AOSX-14-001044

Vuln IDs

V-209563
V-95859

Rule IDs

SV-209563r507076_rule
SV-104997

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220

Checks: C-9814r466315_chk

To view the currently configured flags for the audit daemon, run the following command: /usr/bin/sudo /usr/bin/grep ^flags /etc/security/audit_control Logon events are logged by way of the "aa" flag. If "aa" is not listed in the result of the check, this is a finding.

Fix: F-9814r466316_fix

To ensure the appropriate flags are enabled for auditing, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak '/^flags/ s/$/,aa/' /etc/security/audit_control; /usr/bin/sudo /usr/sbin/audit -s A text editor may also be used to implement the required updates to the "/etc/security/audit_control" file.

b

The macOS system must accept and verify Personal Identity Verification (PIV) credentials, implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network, and only allow the use of DoD PKI-established certificate authorities for verification of the establishment of protected sessions.

SC-23 - Medium - CCI-002470 - V-209564 - SV-209564r507076_rule

RMF Control

SC-23

Severity

M

CCI

CCI-002470

Version

AOSX-14-001060

Vuln IDs

V-209564
V-95861

Rule IDs

SV-209564r507076_rule
SV-104999

The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer authorized (users with revoked certificates). Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that seek to compromise DoD systems or by organizations with insufficient security controls. If the CA used for verifying the certificate is not a DoD-approved CA, trust of this CA has not been established. DoD has mandated the use of the CAC to support identity management and personal authentication for systems covered under Homeland Security Presidential Directive (HSPD) 12, as well as making the CAC a primary component of layered protection for national security systems. The DoD will only accept PKI-certificates obtained from a DoD-approved internal or external certificate authority. Reliance on CAs for the establishment of secure sessions includes, for example, the use of SSL/TLS certificates. Satisfies: SRG-OS-000376-GPOS-00161, SRG-OS-000377-GPOS-00162, SRG-OS-000384-GPOS-00167, SRG-OS-000403-GPOS-00182

Checks: C-9815r466309_chk

To verify that certificate checks are occurring, run the following command. /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep checkCertificateTrust If the output is null or the value returned, "checkCertificateTrust = 0", is not equal to (0) or greater, this is a finding.

Fix: F-9815r466310_fix

This setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system.

b

The macOS system must require individuals to be authenticated with an individual authenticator prior to using a group authenticator.

IA-2 - Medium - CCI-000770 - V-209565 - SV-209565r507076_rule

RMF Control

IA-2

Severity

M

CCI

CCI-000770

Version

AOSX-14-001100

Vuln IDs

V-209565
V-95863

Rule IDs

SV-209565r507076_rule
SV-105001

Administrator users must never log in directly as root. To assure individual accountability and prevent unauthorized access, logging in as root over a remote connection must be disabled. Administrators should only run commands as root after first authenticating with their individual user names and passwords.

Checks: C-9816r282177_chk

To check if SSH has root logins enabled, run the following command: /usr/bin/sudo /usr/bin/grep ^PermitRootLogin /etc/ssh/sshd_config If there is no result, or the result is set to "yes", this is a finding.

Fix: F-9816r282178_fix

To ensure that "PermitRootLogin" is disabled by sshd, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config

b

The macOS system must be configured to disable SMB File Sharing unless it is required.

CM-7 - Medium - CCI-000381 - V-209566 - SV-209566r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002001

Vuln IDs

V-209566
V-95865

Rule IDs

SV-209566r507076_rule
SV-105003

File Sharing is usually non-essential and must be disabled if not required. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.

Checks: C-9817r282180_chk

If SMB File Sharing is required, this is Not Applicable. To check if the SMB File Sharing service is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.smbd If the results do not show the following, this is a finding: "com.apple.smbd" => true

Fix: F-9817r282181_fix

To disable the SMB File Sharing service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.smbd The system may need to be restarted for the update to take effect.

b

The macOS system must be configured to disable Apple File (AFP) Sharing.

CM-7 - Medium - CCI-000381 - V-209567 - SV-209567r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002002

Vuln IDs

V-209567
V-95867

Rule IDs

SV-209567r507076_rule
SV-105005

File Sharing is non-essential and must be disabled. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.

Checks: C-9818r282183_chk

To check if the Apple File (AFP) Sharing service is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.AppleFileServer If the results do not show the following, this is a finding: "com.apple.AppleFileServer" => true

Fix: F-9818r282184_fix

To disable the Apple File (AFP) Sharing service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.AppleFileServer The system may need to be restarted for the update to take effect.

b

The macOS system must be configured to disable the Network File System (NFS) daemon unless it is required.

CM-7 - Medium - CCI-000381 - V-209568 - SV-209568r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002003

Vuln IDs

V-209568
V-95869

Rule IDs

SV-209568r507076_rule
SV-105007

If the system does not require access to NFS file shares or is not acting as an NFS server, support for NFS is non-essential and NFS services must be disabled. NFS is a network file system protocol supported by UNIX-like operating systems. Enabling any service increases the attack surface for an intruder. By disabling unnecessary services, the attack surface is minimized.

Checks: C-9819r282186_chk

If the NFS daemon is required, this is Not Applicable. To check if the NFS daemon is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.nfsd If the results do not show the following, this is a finding: "com.apple.nfsd" => true

Fix: F-9819r282187_fix

To disable the NFS daemon, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.nfsd The system may need to be restarted for the update to take effect.

b

The macOS system must be configured to disable Location Services.

CM-7 - Medium - CCI-000381 - V-209569 - SV-209569r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002004

Vuln IDs

V-209569
V-95871

Rule IDs

SV-209569r507076_rule
SV-105009

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

Checks: C-9820r282189_chk

If Location Services are authorized by the Authorizing Official, this is Not Applicable. Verify that Location Services are disabled: The setting is found in System Preferences >> Security & Privacy >> Privacy >> Location Services. If the box that says "Enable Location Services" is checked, this is a finding.

Fix: F-9820r282190_fix

Disable the Location Services: The setting is found in System Preferences >> Security & Privacy >> Privacy >> Location Services. Uncheck the box labeled "Enable Location Services".

b

The macOS system must be configured to disable Bonjour multicast advertising.

CM-7 - Medium - CCI-000381 - V-209570 - SV-209570r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002005

Vuln IDs

V-209570
V-95873

Rule IDs

SV-209570r507076_rule
SV-105011

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

Checks: C-9821r282192_chk

To check that Bonjour broadcasts have been disabled, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep NoMulticastAdvertisements If the return is not, "NoMulticastAdvertisements = 1", this is a finding.

Fix: F-9821r282193_fix

This setting is enforced using the "Custom Policy" configuration profile.

b

The macOS system must be configured to disable the UUCP service.

CM-7 - Medium - CCI-000381 - V-209571 - SV-209571r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002006

Vuln IDs

V-209571
V-95875

Rule IDs

SV-209571r507076_rule
SV-105013

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The system must not have the UUCP service active.

Checks: C-9822r282195_chk

To check if the UUCP service is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.uucp If the results do not show the following, this is a finding: "com.apple.uucp" => true

Fix: F-9822r282196_fix

To disable the UUCP service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.uucp The system may need to be restarted for the update to take effect.

b

The macOS system must be configured to disable Internet Sharing.

CM-7 - Medium - CCI-000381 - V-209572 - SV-209572r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002007

Vuln IDs

V-209572
V-95877

Rule IDs

SV-209572r507076_rule
SV-105015

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

Checks: C-9823r282198_chk

To check if Internet Sharing is disabled, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep forceInternetSharingOff If the return is not, "forceInternetSharingOff = 1", this is a finding.

Fix: F-9823r282199_fix

This setting is enforced using the "Custom Policy" configuration profile.

b

The macOS system must be configured to disable Web Sharing.

CM-7 - Medium - CCI-000381 - V-209573 - SV-209573r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002008

Vuln IDs

V-209573
V-95883

Rule IDs

SV-209573r507076_rule
SV-105021

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

Checks: C-9824r282201_chk

To check if Web Sharing is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep org.apache.httpd If the results do not show the following, this is a finding: "org.apache.httpd" => true

Fix: F-9824r282202_fix

To disable Web Sharing, run the following command: /usr/bin/sudo /bin/launchctl disable system/org.apache.httpd The system may need to be restarted for the update to take effect.

a

The macOS system must be configured to disable AirDrop.

CM-7 - Low - CCI-000381 - V-209574 - SV-209574r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002009

Vuln IDs

V-209574
V-95885

Rule IDs

SV-209574r507076_rule
SV-105023

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

Checks: C-9825r282204_chk

AirDrop relies on Bluetooth LE for discovery. To check if AirDrop has been disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep DisableBluetooth If the return is not, "DisableBluetooth = 1", this is a finding.

Fix: F-9825r282205_fix

This setting is enforced using the "Custom Policy" configuration profile.

a

The macOS system must be configured to disable the application FaceTime.

CM-7 - Low - CCI-000381 - V-209575 - SV-209575r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002010

Vuln IDs

V-209575
V-95887

Rule IDs

SV-209575r507076_rule
SV-105025

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The application FaceTime establishes connections to Apple's iCloud, despite using security controls to disable iCloud access. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9826r282207_chk

To check if there is a configuration policy defined for "Application Restrictions", run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 5 familyControlsEnabled | grep "FaceTime" If the return does not contain "/Applications/FaceTime.app", this is a finding.

Fix: F-9826r282208_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable the application Messages.

CM-7 - Low - CCI-000381 - V-209576 - SV-209576r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002011

Vuln IDs

V-209576
V-95889

Rule IDs

SV-209576r507076_rule
SV-105027

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The application Messages establishes connections to Apple's iCloud, despite using security controls to disable iCloud access. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9827r282210_chk

To check if there is a configuration policy defined for "Application Restrictions", run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 5 familyControlsEnabled | grep "Messages.app" If the return does not contain "/Applications/Messages.app", this is a finding.

Fix: F-9827r282211_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable the iCloud Calendar services.

CM-7 - Low - CCI-000381 - V-209577 - SV-209577r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002012

Vuln IDs

V-209577
V-95891

Rule IDs

SV-209577r507076_rule
SV-105029

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Calendar application's connections to Apple's iCloud, must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9828r282213_chk

To check if iCloudCalendar is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudCalendar If the return is not “allowCloudCalendar = 0”, this is a finding.

Fix: F-9828r282214_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable the iCloud Reminders services.

CM-7 - Low - CCI-000381 - V-209578 - SV-209578r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002013

Vuln IDs

V-209578
V-95893

Rule IDs

SV-209578r507076_rule
SV-105031

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Reminder application's connections to Apple's iCloud, must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9829r282216_chk

To check if iCloud Reminders is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudReminders If the return is not “allowCloudReminders = 0”, this is a finding.

Fix: F-9829r282217_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable iCloud Address Book services.

CM-7 - Low - CCI-000381 - V-209579 - SV-209579r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002014

Vuln IDs

V-209579
V-95895

Rule IDs

SV-209579r507076_rule
SV-105033

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Address Book(Contacts) application's connections to Apple's iCloud, must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9830r282219_chk

/usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudAddressBook If the result is not “allowCloudAddressBook = 0”, this is a finding.

Fix: F-9830r282220_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable the Mail iCloud services.

CM-7 - Low - CCI-000381 - V-209580 - SV-209580r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002015

Vuln IDs

V-209580
V-95897

Rule IDs

SV-209580r507076_rule
SV-105035

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Mail application's connections to Apple's iCloud, must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9831r282222_chk

To check if Mail iCloud is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudMail If the result is not “allowCloudMail = 0”, this is a finding.

Fix: F-9831r282223_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

a

The macOS system must be configured to disable the iCloud Notes services.

CM-7 - Low - CCI-000381 - V-209581 - SV-209581r507076_rule

RMF Control

CM-7

Severity

L

CCI

Version

AOSX-14-002016

Vuln IDs

V-209581
V-95899

Rule IDs

SV-209581r507076_rule
SV-105037

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Notes application's connections to Apple's iCloud, must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9832r282225_chk

To check if iCloud Notes is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudNotes If the return is not “allowCloudNotes = 0”, this is a finding.

Fix: F-9832r282226_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must cover or disable the built-in or attached camera when not in use.

CM-7 - Medium - CCI-000381 - V-209582 - SV-209582r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002017

Vuln IDs

V-209582
V-95901

Rule IDs

SV-209582r507076_rule
SV-105039

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Failing to disconnect from collaborative computing devices (i.e. cameras) can result in subsequent compromises of organizational information. Providing easy methods to physically disconnect from such devices after a collaborative computing session helps to ensure that participants actually carry out the disconnect activity without having to go through complex and tedious procedures. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9833r364819_chk

If the device or operating system does not have a camera installed, this requirement is not applicable. This requirement is not applicable to mobile devices (smartphones and tablets), where the use of the camera is a local AO decision. This requirement is not applicable to dedicated VTC suites located in approved VTC locations that are centrally managed. For an external camera, if there is not a method for the operator to manually disconnect camera at the end of collaborative computing sessions, this is a finding. For a built-in camera, the camera must be protected by a camera cover (e.g. laptop camera cover slide) when not in use. If the built-in camera is not protected with a camera cover, or is not physically disabled, this is a finding. If the camera is not disconnected, covered or physically disabled, the following configuration is required: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCamera If the result is “allowCamera = 1” and the collaborative computing device has not been authorized for use, this is a finding.

Fix: F-9833r282229_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the application Mail.

CM-7 - Medium - CCI-000381 - V-209583 - SV-209583r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002019

Vuln IDs

V-209583
V-95905

Rule IDs

SV-209583r507076_rule
SV-105043

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The application Mail establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.

Checks: C-9834r282231_chk

To check if there is a configuration policy defined for "Application Restrictions", run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 5 familyControlsEnabled | grep "Mail.app" If the return does not contain "/Applications/Mail.app", this is a finding.

Fix: F-9834r282232_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable Siri and dictation.

CM-7 - Medium - CCI-000381 - V-209584 - SV-209584r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002020

Vuln IDs

V-209584
V-95907

Rule IDs

SV-209584r507076_rule
SV-105045

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. Siri and dictation must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9835r282234_chk

To check if Siri and dictation has been disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -e "Assistant Allowed" -e "Ironwood Allowed" If the output is not the following, this is a finding: “Assistant Allowed = 0” “Ironwood Allowed = 0”

Fix: F-9835r282235_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable sending diagnostic and usage data to Apple.

CM-7 - Medium - CCI-000382 - V-209585 - SV-209585r507076_rule

RMF Control

CM-7

Severity

M

CCI

CCI-000382

Version

AOSX-14-002021

Vuln IDs

V-209585
V-95909

Rule IDs

SV-209585r507076_rule
SV-105047

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The ability to submit diagnostic data to Apple must be disabled.

Checks: C-9836r466273_chk

Sending diagnostic and usage data to Apple must be disabled. To check if a configuration profile is configured to enforce this setting, run the following command: /usr/bin/sudo /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowDiagnosticSubmission If "allowDiagnosticSubmission" is not set to "0", this is a finding. Alternately, the setting is found in System Preferences >> Security & Privacy >> Privacy >> Diagnostics & Usage. If the box that says "Send diagnostic & usage data to Apple" is checked, this is a finding.

Fix: F-9836r466274_fix

This setting is enforced using the "Restrictions Policy" configuration profile. The setting "Send diagnostic & usage data to Apple" is found in System Preferences >> Security & Privacy >> Privacy >> Diagnostics & Usage. Uncheck the box that says "Send diagnostic & usage data to Apple." To apply the setting from the command line, run the following commands: /usr/bin/defaults read "/Library/Application Support/CrashReporter/DiagnosticMessagesHistory.plist" AutoSubmit /usr/bin/sudo /usr/bin/defaults write "/Library/Application Support/CrashReporter/DiagnosticMessagesHistory.plist" AutoSubmit -bool false /usr/bin/sudo /bin/chmod 644 /Library/Application\ Support/CrashReporter/DiagnosticMessagesHistory.plist /usr/bin/sudo /usr/bin/chgrp admin /Library/Application\ Support/CrashReporter/DiagnosticMessagesHistory.plist

b

The macOS system must be configured to disable Remote Apple Events.

CM-7 - Medium - CCI-000382 - V-209586 - SV-209586r507076_rule

RMF Control

CM-7

Severity

M

CCI

CCI-000382

Version

AOSX-14-002022

Vuln IDs

V-209586
V-95911

Rule IDs

SV-209586r507076_rule
SV-105049

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

Checks: C-9837r282240_chk

To check if Remote Apple Events is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.AEServer If the results do not show the following, this is a finding. "com.apple.AEServer" => true

Fix: F-9837r282241_fix

To disable Remote Apple Events, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.AEServer The system may need to be restarted for the update to take effect.

b

The macOS system must be configured to disable the application Calendar.

CM-7 - Medium - CCI-000381 - V-209587 - SV-209587r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002023

Vuln IDs

V-209587
V-95913

Rule IDs

SV-209587r507076_rule
SV-105051

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The application Calendar establishes connections to Apple's iCloud, despite using security controls to disable iCloud access.

Checks: C-9838r282243_chk

To check if there is a configuration policy defined for "Application Restrictions", run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 5 familyControlsEnabled | grep "Calendar.app" If the return does not contain "/Applications/Calendar.app", this is a finding.

Fix: F-9838r282244_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

c

The macOS system must be configured to disable the system preference pane for iCloud.

CM-7 - High - CCI-001774 - V-209588 - SV-209588r507076_rule

RMF Control

CM-7

Severity

H

CCI

CCI-001774

Version

AOSX-14-002031

Vuln IDs

V-209588
V-95915

Rule IDs

SV-209588r507076_rule
SV-105053

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The iCloud System Preference Pane must be disabled.

Checks: C-9839r282246_chk

To check if the system has the correct setting in the configuration profile to disable access to the iCloud preference pane, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 DisabledPreferencePanes | grep icloud If the return is not “com.apple.preferences.icloud”, this is a finding.

Fix: F-9839r282247_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the system preference pane for Internet Accounts.

CM-7 - Medium - CCI-001774 - V-209589 - SV-209589r507076_rule

RMF Control

CM-7

Severity

M

CCI

CCI-001774

Version

AOSX-14-002032

Vuln IDs

V-209589
V-95917

Rule IDs

SV-209589r507076_rule
SV-105055

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

Checks: C-9840r282249_chk

To check if the system has the correct setting in the configuration profile to disable access to the Internet Accounts System preference pane, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 DisabledPreferencePanes If the return is not an array which contains: “com.apple.preferences.internetaccounts”, this is a finding.

Fix: F-9840r282250_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the Siri Setup services.

CM-7 - Medium - CCI-000381 - V-209590 - SV-209590r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002034

Vuln IDs

V-209590
V-95919

Rule IDs

SV-209590r507076_rule
SV-105057

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

Checks: C-9841r282252_chk

To check if SiriSetup is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipSiriSetup If the return is not “SkipSiriSetup = 1”, this is a finding.

Fix: F-9841r282253_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the Cloud Setup services.

CM-7 - Medium - CCI-000381 - V-209591 - SV-209591r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002035

Vuln IDs

V-209591
V-95921

Rule IDs

SV-209591r507076_rule
SV-105059

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

Checks: C-9842r282255_chk

To check if CloudSetup is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipCloudSetup If the return is not “SkipCloudSetup = 1”, this is a finding.

Fix: F-9842r282256_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the Privacy Setup services.

CM-7 - Medium - CCI-000381 - V-209592 - SV-209592r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002036

Vuln IDs

V-209592
V-95923

Rule IDs

SV-209592r507076_rule
SV-105061

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

Checks: C-9843r282258_chk

To check if PrivacySetup is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipPrivacySetup If the return is not “SkipPrivacySetup = 1”, this is a finding.

Fix: F-9843r282259_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must be configured to disable the Cloud Storage Setup services.

CM-7 - Medium - CCI-000381 - V-209593 - SV-209593r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002037

Vuln IDs

V-209593
V-95925

Rule IDs

SV-209593r507076_rule
SV-105063

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

Checks: C-9844r282261_chk

To check if CloudStorage Setup is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipiCloudStorageSetup If the return is not “SkipiCloudStorageSetup = 1”, this is a finding.

Fix: F-9844r282262_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

c

The macOS system must be configured to disable the tftpd service.

IA-5 - High - CCI-000197 - V-209594 - SV-209594r507076_rule

RMF Control

IA-5

Severity

H

CCI

CCI-000197

Version

AOSX-14-002038

Vuln IDs

V-209594
V-95927

Rule IDs

SV-209594r507076_rule
SV-105065

The "tftpd" service must be disabled as it sends all data in a clear-text form that can be easily intercepted and read. The data needs to be protected at all times during transmission, and encryption is the standard method for protecting data in transit. If the data is not encrypted during transmission, it can be plainly read (i.e., clear text) and easily compromised. Disabling ftp is one way to mitigate this risk. Administrators should be instructed to use an alternate service for data transmission that uses encryption, such as SFTP.

Checks: C-9845r282264_chk

To check if the tftpd service is disabled, run the following command: sudo launchctl print-disabled system | grep tftpd If the results do not show the following, this is a finding: "com.apple.tftpd" => true

Fix: F-9845r282265_fix

To disable the tftpd service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.tftpd

b

The macOS system must disable Siri pop-ups.

CM-7 - Medium - CCI-000381 - V-209595 - SV-209595r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002039

Vuln IDs

V-209595
V-95929

Rule IDs

SV-209595r507076_rule
SV-105067

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Siri setup pop-up must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9846r282267_chk

To check if the Skip Siri Setup prompt is enabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipSiriSetup If the output is null or "SkipSiriSetup" is not set to "1", this is a finding.

Fix: F-9846r282268_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable iCloud Keychain synchronization.

CM-7 - Medium - CCI-000381 - V-209596 - SV-209596r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002040

Vuln IDs

V-209596
V-95931

Rule IDs

SV-209596r507076_rule
SV-105069

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. Keychain synchronization must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9847r282270_chk

To view the setting for the iCloud Keychain Synchronization configuration, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudKeychainSync If the output is null or not "allowCloudKeychainSync = 0", this is a finding.

Fix: F-9847r282271_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable iCloud document synchronization.

CM-7 - Medium - CCI-000381 - V-209597 - SV-209597r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002041

Vuln IDs

V-209597
V-95933

Rule IDs

SV-209597r507076_rule
SV-105071

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. iCloud document synchronization must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9848r282273_chk

To view the setting for the iCloud Document Synchronization configuration, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudDocumentSync If the output is null or not "allowCloudDocumentSync = 0", this is a finding.

Fix: F-9848r282274_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable iCloud bookmark synchronization.

CM-7 - Medium - CCI-000381 - V-209598 - SV-209598r507076_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002042

Vuln IDs

V-209598
V-95935

Rule IDs

SV-209598r507076_rule
SV-105073

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. iCloud Bookmark syncing must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9849r282276_chk

To view the setting for the iCloud Bookmark Synchronization configuration, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudBookmarks If the output is null or not "allowCloudBookmarks = 0" this is a finding.

Fix: F-9849r282277_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable iCloud photo library.

CM-7 - Medium - CCI-000381 - V-209599 - SV-209599r533203_rule

RMF Control

CM-7

Severity

M

CCI

Version

AOSX-14-002043

Vuln IDs

V-209599
V-95937

Rule IDs

SV-209599r533203_rule
SV-105075

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. iCloud Photo Library must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Checks: C-9850r533202_chk

To check if the system has the correct setting in the configuration profile to disable access to the iCloud preference pane, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 DisabledPreferencePanes | grep icloud If the return is not “com.apple.preferences.icloud”, this is a CAT I finding. To view the setting for the iCloud Photo Library configuration, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudPhotoLibrary If the output is null or not "allowCloudPhotoLibrary = 0", this is a finding.

Fix: F-9850r485680_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable Cloud Document Sync.

CM-7 - Medium - CCI-001774 - V-209600 - SV-209600r507076_rule

RMF Control

CM-7

Severity

M

CCI

CCI-001774

Version

AOSX-14-002049

Vuln IDs

V-209600
V-95939

Rule IDs

SV-209600r507076_rule
SV-105077

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

Checks: C-9851r282282_chk

To view the setting for the iCloud Desktop and Documents configuration, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudDocumentSync If the output is null or not "allowCloudDocumentSync = 0", this is a finding.

Fix: F-9851r282283_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must disable the Screen Sharing feature.

CM-6 - Medium - CCI-000366 - V-209601 - SV-209601r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002050

Vuln IDs

V-209601
V-95941

Rule IDs

SV-209601r507076_rule
SV-105079

The Screen Sharing feature allows remote users to view or control the desktop of the current user. A malicious user can take advantage of screen sharing to gain full access to the system remotely, either with stolen credentials or by guessing the username and password. Disabling Screen Sharing mitigates this risk.

Checks: C-9852r282285_chk

To check if the Screen Sharing service is disabled, use the following command: /usr/bin/sudo /bin/launchctl print-disabled system | /usr/bin/grep com.apple.screensharing If the results do not show the following, this is a finding: "com.apple.screensharing" => true

Fix: F-9852r282286_fix

To disable the Screen Sharing service, run the following command: /usr/bin/sudo /bin/launchctl disable system/com.apple.screensharing The system may need to be restarted for the update to take effect.

b

The macOS system must allow only applications downloaded from the App Store to run.

CM-6 - Medium - CCI-000366 - V-209602 - SV-209602r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002060

Vuln IDs

V-209602
V-95943

Rule IDs

SV-209602r507076_rule
SV-105081

Gatekeeper settings must be configured correctly to only allow the system to run applications downloaded from the Mac App Store or applications signed with a valid Apple Developer ID code. Administrator users will still have the option to override these settings on a per-app basis. Gatekeeper is a security feature that ensures that applications must be digitally signed by an Apple-issued certificate in order to run. Digital signatures allow the macOS host to verify that the application has not been modified by a malicious third party.

Checks: C-9853r282288_chk

To verify only applications downloaded from the App Store are allowed to run, type the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -E '(EnableAssessment | AllowIdentifiedDevelopers)' If the return is null, or is not the following, this is a finding: AllowIdentifiedDevelopers = 1; EnableAssessment = 1;

Fix: F-9853r282289_fix

This setting is enforced using the "Restrictions Policy" configuration profile

b

The macOS system must be configured so that end users cannot override Gatekeeper settings.

CM-6 - Medium - CCI-000366 - V-209603 - SV-209603r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002061

Vuln IDs

V-209603
V-95945

Rule IDs

SV-209603r507076_rule
SV-105083

Gatekeeper must be configured with a configuration profile to prevent normal users from overriding its setting. If users are allowed to disable Gatekeeper or set it to a less restrictive setting, malware could be introduced into the system. Gatekeeper is a security feature that ensures applications must be digitally signed by an Apple-issued certificate in order to run. Digital signatures allow the macOS host to verify the application has not been modified by a malicious third party.

Checks: C-9854r282291_chk

To verify only applications downloaded from the App Store are allowed to run, type the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep DisableOverride If the return is null or is not the following, this is a finding: DisableOverride = 1;

Fix: F-9854r282292_fix

This setting is enforced using the "RestrictionsPolicy" configuration profile.

a

The macOS system must be configured with Bluetooth turned off unless approved by the organization.

SC-8 - Low - CCI-002418 - V-209604 - SV-209604r507076_rule

RMF Control

SC-8

Severity

L

CCI

CCI-002418

Version

AOSX-14-002062

Vuln IDs

V-209604
V-95947

Rule IDs

SV-209604r507076_rule
SV-105085

Without protection of communications with wireless peripherals, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read, altered, or used to compromise the operating system. This requirement applies to wireless peripheral technologies (e.g., wireless mice, keyboards, displays, etc.) used with an operating system. Wireless peripherals (e.g., Wi-Fi/Bluetooth/IR Keyboards, Mice, and Pointing Devices and Near Field Communications [NFC]) present a unique challenge by creating an open, unsecured port on a computer. Wireless peripherals must meet DoD requirements for wireless data transmission and be approved for use by the AO. Even though some wireless peripherals, such as mice and pointing devices, do not ordinarily carry information that need to be protected, modification of communications with these wireless peripherals may be used to compromise the operating system. Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. Protecting the confidentiality and integrity of communications with wireless peripherals can be accomplished by physical means (e.g., employing physical barriers to wireless radio frequencies) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa. If the wireless peripheral is only passing telemetry data, encryption of the data may not be required.

Checks: C-9855r282294_chk

If Bluetooth connectivity is required to facilitate use of approved external devices, this is Not Applicable. To check if Bluetooth is disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep DisableBluetooth If the return is null or is not "DisableBluetooth = 1", this is a finding.

Fix: F-9855r282295_fix

This setting is enforced using the "Custom Policy" configuration profile.

c

The macOS system must disable the guest account.

CM-5 - High - CCI-001813 - V-209605 - SV-209605r507076_rule

RMF Control

CM-5

Severity

H

CCI

CCI-001813

Version

AOSX-14-002063

Vuln IDs

V-209605
V-95949

Rule IDs

SV-209605r507076_rule
SV-105087

Failure to provide logical access restrictions associated with changes to system configuration may have significant effects on the overall security of the system. When dealing with access restrictions pertaining to change control, it should be noted that any changes to the hardware, software, and/or firmware components of the operating system can have significant effects on the overall security of the system. Accordingly, only qualified and authorized individuals should be allowed to obtain access to operating system components for the purposes of initiating changes, including upgrades and modifications. Logical access restrictions include, for example, controls that restrict access to workflow automation, media libraries, abstract layers (e.g., changes implemented into third-party interfaces rather than directly into information systems), and change windows (e.g., changes occur only during specified times, making unauthorized changes easy to discover).

Checks: C-9856r282297_chk

To check that the system is configured to disable the guest account, run the following command: # /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep DisableGuestAccount If the result is null or not "DisableGuestAccount = 1", this is a finding.

Fix: F-9856r282298_fix

This is managed with Login Window Policy.

c

The macOS system must have the security assessment policy subsystem enabled.

CM-5 - High - CCI-001749 - V-209606 - SV-209606r507076_rule

RMF Control

CM-5

Severity

H

CCI

CCI-001749

Version

AOSX-14-002064

Vuln IDs

V-209606
V-95951

Rule IDs

SV-209606r507076_rule
SV-105089

Any changes to the hardware, software, and/or firmware components of the information system and/or application can potentially have significant effects on the overall security of the system. Accordingly, software defined by the organization as critical must be signed with a certificate that is recognized and approved by the organization.

Checks: C-9857r282300_chk

To check the status of the Security assessment policy subsystem, run the following command: /usr/bin/sudo /usr/sbin/spctl --status | /usr/bin/grep enabled If nothing is returned, this is a finding.

Fix: F-9857r282301_fix

To enable the Security assessment policy subsystem, run the following command: /usr/bin/sudo /usr/sbin/spctl --master-enable

b

The macOS system must limit the ability of non-privileged users to grant other users direct access to the contents of their home directories/folders.

CM-6 - Medium - CCI-000366 - V-209607 - SV-209607r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002065

Vuln IDs

V-209607
V-95533

Rule IDs

SV-209607r507076_rule
SV-104721

Users' home directories/folders may contain information of a sensitive nature. Non-privileged users should coordinate any sharing of information with an SA through shared resources.

Checks: C-9858r282303_chk

For each listing, with the exception of "Shared", verify that the directory is owned by the username, that only the owner has "write" permissions, and the correct Access Control Entry is listed. To verify permissions on users' home directories, use the following command: # ls -le /Users drwxr-xr-x+ 12 Guest _guest 384 Apr 2 09:40 Guest 0: group:everyone deny delete drwxrwxrwt 4 root wheel 128 Mar 28 05:53 Shared drwxr-xr-x+ 13 admin staff 416 Apr 8 08:58 admin 0: group:everyone deny delete drwxr-xr-x+ 11 test user 352 Apr 8 09:00 test 0: group:everyone deny delete If the directory is not owned by the user, this is a finding. If anyone other than the user has "write" permissions to the directory, this is a finding. If the Access Control Entry listed is not "0: group:everyone deny delete", this is a finding.

Fix: F-9858r282304_fix

To reset the permissions on a users' home directory to their defaults, run the following command, where "username" is the user's short name: sudo diskutil resetUserPermissions / username

b

The macOS system must not allow an unattended or automatic logon to the system.

CM-6 - Medium - CCI-000366 - V-209608 - SV-209608r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002066

Vuln IDs

V-209608
V-95953

Rule IDs

SV-209608r507076_rule
SV-105091

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

Checks: C-9859r282306_chk

To check if the system is configured to automatically log on, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep DisableAutoLoginClient If "com.apple.login.mcx.DisableAutoLoginClient" is not set to "1", this is a finding.

Fix: F-9859r282307_fix

This setting is enforced using the "Login Window Policy" configuration profile.

b

The macOS system must prohibit user installation of software without explicit privileged status.

CM-11 - Medium - CCI-001812 - V-209609 - SV-209609r507076_rule

RMF Control

CM-11

Severity

M

CCI

CCI-001812

Version

AOSX-14-002067

Vuln IDs

V-209609
V-95537

Rule IDs

SV-209609r507076_rule
SV-104723

Allowing regular users to install software, without explicit privileges, creates the risk that untested or potentially malicious software will be installed on the system. Explicit privileges (escalated or administrative privileges) provide the regular user with explicit capabilities and control that exceeds the rights of a regular user. Operating system functionality will vary, and while users are not permitted to install unapproved software, there may be instances where the organization allows the user to install approved software packages, such as from an approved software repository. The operating system or software configuration management utility must enforce control of software installation by users based upon what types of software installations are permitted (e.g., updates and security patches to existing software) and what types of installations are prohibited (e.g., software whose pedigree with regard to being potentially malicious is unknown or suspect) by the organization.

Checks: C-9860r282309_chk

To check if the system is configured to prohibit user installation of software, first check to ensure the Parental Controls are enabled with the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 familyControlsEnabled | grep “/Users" If the result is null, or does not contain “/Users/“, this is a finding.

Fix: F-9860r282310_fix

This setting is enforced using the "Restrictions Policy" configuration profile.

b

The macOS system must set permissions on user home directories to prevent users from having access to read or modify another users files.

CM-6 - Medium - CCI-000366 - V-209610 - SV-209610r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-002068

Vuln IDs

V-209610
V-95955

Rule IDs

SV-209610r507076_rule
SV-105093

Configuring the operating system to use the most restrictive permissions possible for user home directories helps to protect against inadvertent disclosures.

Checks: C-9861r282312_chk

To verify that permissions are set correctly on user home directories, use the following commands: ls -le /Users Should return a listing of the permissions of the root of every user account configured on the system. For each of the users, the permissions should be: "drwxr-xr-x+" with the user listed as the owner and the group listed as "staff". The plus (+) sign indicates an associated Access Control List, which should be: 0: group:everyone deny delete For every authorized user account, also run the following command: /usr/bin/sudo ls -le /Users/userid, where userid is an existing user. This command will return the permissions of all of the objects under the users' home directory. The permissions for each of the subdirectories should be: drwx------+ 0: group:everyone deny delete With the exception of the "Public" directory, whose permissions should match the following: drwxr-xr-x+ 0: group:everyone deny delete If the permissions returned by either of these checks differ from what is shown, this is a finding.

Fix: F-9861r282313_fix

To ensure the appropriate permissions are set for each user on the system, run the following command: diskutil resetUserPermissions / userid, where userid is the user name for the user whose home directory permissions need to be repaired.

b

The macOS system must uniquely identify peripherals before establishing a connection.

IA-3 - Medium - CCI-000778 - V-209611 - SV-209611r507076_rule

RMF Control

IA-3

Severity

M

CCI

CCI-000778

Version

AOSX-14-002069

Vuln IDs

V-209611
V-95541

Rule IDs

SV-209611r507076_rule
SV-104725

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

Checks: C-9862r466279_chk

To check that macOS is configured to require authentication to all system preference panes, use the following commands: /usr/bin/sudo /usr/bin/security authorizationdb read system.preferences | grep -A1 shared If what is returned does not include the following, this is a finding. <key>shared</key> <false/>

Fix: F-9862r466280_fix

To ensure that authentication is required to access all system level preference panes use the following procedure: Copy the authorization database to a file using the following command: /usr/bin/sudo /usr/bin/security authorizationdb read system.preferences > ~/Desktop/authdb.txt edit the file to change: <key>shared</key> <true/> To read: <key>shared</key> <false/> Reload the authorization database with the following command: /usr/bin/sudo /usr/bin/security authorizationdb write system.preferences < ~/Desktop/authdb.txt

c

The macOS system must use an approved antivirus program.

CM-6 - High - CCI-000366 - V-209612 - SV-209612r507076_rule

RMF Control

CM-6

Severity

H

CCI

Version

AOSX-14-002070

Vuln IDs

V-209612
V-95543

Rule IDs

SV-209612r507076_rule
SV-104727

An approved antivirus product must be installed and configured to run. Malicious software can establish a base on individual desktops and servers. Employing an automated mechanism to detect this type of software will aid in elimination of the software from the operating system.

Checks: C-9863r282318_chk

Ask the System Administrator (SA) or Information System Security Officer (ISSO) if an approved antivirus solution is loaded on the system. The antivirus solution may be bundled with an approved host-based security solution. If there is no local antivirus solution installed on the system, this is a finding.

Fix: F-9863r282319_fix

Install an approved antivirus solution onto the system.

c

The macOS system must issue or obtain public key certificates under an appropriate certificate policy from an approved service provider.

IA-5 - High - CCI-000185 - V-209613 - SV-209613r507076_rule

RMF Control

IA-5

Severity

H

CCI

CCI-000185

Version

AOSX-14-003001

Vuln IDs

V-209613
V-95957

Rule IDs

SV-209613r507076_rule
SV-105095

DoD-approved certificates must be installed to the System Keychain so they will be available to all users. For user certificates, each organization obtains certificates from an approved, shared service provider, as required by OMB policy. For federal agencies operating a legacy public key infrastructure cross-certified with the Federal Bridge Certification Authority at medium assurance or higher, this Certification Authority will suffice. This control focuses on certificates with a visibility external to the information system and does not include certificates related to internal system operations; for example, application-specific time services. Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated. Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000478-GPOS-00223

Checks: C-9864r282321_chk

To view a list of installed certificates, run the following command: /usr/bin/sudo /usr/bin/security dump-keychain | /usr/bin/grep labl | awk -F\" '{ print $4 }' If this list does not contain approved certificates, this is a finding.

Fix: F-9864r282322_fix

Obtain the approved DOD certificates from the appropriate authority. Use Keychain Access from "/Applications/Utilities" to add certificates to the System Keychain.

b

The macOS system must enable certificate for smartcards.

IA-5 - Medium - CCI-000186 - V-209614 - SV-209614r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000186

Version

AOSX-14-003002

Vuln IDs

V-209614
V-95959

Rule IDs

SV-209614r507076_rule
SV-105097

To prevent untrusted certificates the certificates on a smartcard card must be valid in these ways: its issuer is system-trusted, the certificate is not expired, its "valid-after" date is in the past, and it passes CRL and OCSP checking.

Checks: C-9865r282324_chk

To view the setting for the smartcard certification configuration, run the following command: sudo /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep checkCertificateTrust If the return is not "checkCertificateTrust = 1;" with the numeral equal to 1 or greater, this is a finding.

Fix: F-9865r282325_fix

This setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system.

b

The macOS system must map the authenticated identity to the user or group account for PKI-based authentication.

IA-5 - Medium - CCI-000187 - V-209615 - SV-209615r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000187

Version

AOSX-14-003005

Vuln IDs

V-209615
V-95961

Rule IDs

SV-209615r507076_rule
SV-105099

Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the individual user or group will not be available for forensic analysis.

Checks: C-9866r466270_chk

To view the setting for the smartcard certification configuration, run the following command: sudo /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep enforceSmartCard If the return is not "enforceSmartCard = 1;" this is a finding.

Fix: F-9866r466271_fix

For stand-alone systems, this setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system.

b

The macOS system must enforce password complexity by requiring that at least one numeric character be used.

IA-5 - Medium - CCI-000194 - V-209616 - SV-209616r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000194

Version

AOSX-14-003007

Vuln IDs

V-209616
V-95963

Rule IDs

SV-209616r507076_rule
SV-105101

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

Checks: C-9867r282330_chk

To check the currently applied policies for passwords and accounts, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep requireAlphanumeric If the return is not “requireAlphanumeric = 1”, this is a finding.

Fix: F-9867r282331_fix

This setting is enforced using the "Passcode Policy" configuration profile.

b

The macOS system must enforce a 60-day maximum password lifetime restriction.

IA-5 - Medium - CCI-000199 - V-209617 - SV-209617r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000199

Version

AOSX-14-003008

Vuln IDs

V-209617
V-95965

Rule IDs

SV-209617r507076_rule
SV-105103

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

Checks: C-9868r282333_chk

To check the currently applied policies for passwords and accounts, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep maxPINAgeInDays If "maxPINAgeInDays" is set a value greater than "60", this is a finding.

Fix: F-9868r282334_fix

This setting is enforced using the "Passcode Policy" configuration profile.

b

The macOS system must prohibit password reuse for a minimum of five generations.

IA-5 - Medium - CCI-000200 - V-209618 - SV-209618r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000200

Version

AOSX-14-003009

Vuln IDs

V-209618
V-95967

Rule IDs

SV-209618r507076_rule
SV-105105

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

Checks: C-9869r282336_chk

To check the currently applied policies for passwords and accounts, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep pinHistory If the return is not “pinHistory = 5” or greater, this is a finding.

Fix: F-9869r282337_fix

This setting is enforced using the "Passcode Policy" configuration profile.

b

The macOS system must enforce a minimum 15-character password length.

IA-5 - Medium - CCI-000205 - V-209619 - SV-209619r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-000205

Version

AOSX-14-003010

Vuln IDs

V-209619
V-95969

Rule IDs

SV-209619r507076_rule
SV-105107

The minimum password length must be set to 15 characters. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. The use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.

Checks: C-9870r282339_chk

To check the currently applied policies for passwords and accounts, use the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep minLength If the return is null or not “minLength = 15”, this is a finding.

Fix: F-9870r282340_fix

This setting is enforced using the "Passcode Policy" configuration profile.

b

The macOS system must enforce password complexity by requiring that at least one special character be used.

IA-5 - Medium - CCI-001619 - V-209620 - SV-209620r507076_rule

RMF Control

IA-5

Severity

M

CCI

CCI-001619

Version

AOSX-14-003011

Vuln IDs

V-209620
V-95971

Rule IDs

SV-209620r507076_rule
SV-105109

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

Checks: C-9871r282342_chk

Password policy can be set with a configuration profile or the "pwpolicy" utility. If password policy is set with a configuration profile, run the following command to check if the system is configured to require that passwords contain at least one special character: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep minComplexChars If the return is null or not ” minComplexChars = 1”, this is a finding. Run the following command to check if the system is configured to require that passwords not contain repeated sequential characters or characters in increasing and decreasing sequential order: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowSimple If "allowSimple" is not set to "0" or is undefined, this is a finding.

Fix: F-9871r282343_fix

This setting may be enforced using the "Passcode Policy" configuration profile or by a directory service.

b

The macOS system must be configured to prevent displaying password hints.

CM-6 - Medium - CCI-000366 - V-209621 - SV-209621r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-003012

Vuln IDs

V-209621
V-95973

Rule IDs

SV-209621r507076_rule
SV-105111

Password hints leak information about passwords in use and can lead to loss of confidentiality.

Checks: C-9872r282345_chk

To check that password hints are disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep RetriesUntilHint If the return is null or is not "RetriesUntilHint = 0", this is a finding.

Fix: F-9872r282346_fix

This setting is enforce using the "Login Window" Policy.

b

macOS must be configured with a firmware password to prevent access to single user mode and booting from alternative media.

CM-6 - Medium - CCI-000366 - V-209622 - SV-209622r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-003013

Vuln IDs

V-209622
V-95975

Rule IDs

SV-209622r507076_rule
SV-105113

Single user mode and the boot picker, as well as numerous other tools are available on macOS through booting while holding the "Option" key down. Setting a firmware password restricts access to these tools.

Checks: C-9873r466318_chk

To check that password hints are disabled, run the following command: # sudo /usr/sbin/firmwarepasswd -check If the return is not, "Password Enabled: Yes", this is a finding.

Fix: F-9873r466319_fix

To set a firmware passcode use the following command. sudo /usr/sbin/firmwarepasswd -setpasswd Note: If firmware password or passcode is forgotten, the only way to reset the forgotten password is through the use of a machine specific binary generated and provided by Apple. Schedule a support call, and provide proof of purchase before the firmware binary will be generated.

b

The macOS system must use multifactor authentication for local and network access to privileged and non-privileged accounts.

IA-2 - Medium - CCI-000765 - V-209623 - SV-209623r507076_rule

RMF Control

IA-2

Severity

M

CCI

CCI-000765

Version

AOSX-14-003020

Vuln IDs

V-209623
V-95565

Rule IDs

SV-209623r507076_rule
SV-104729

Without the use of multifactor authentication, the ease of access to privileged and non-privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. Factors include: 1) something a user knows (e.g., password/PIN); 2) something a user has (e.g., cryptographic identification device, token); and 3) something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the Internet). Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network. The DoD CAC with DoD-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055

Checks: C-9874r466276_chk

If the system is connected to a directory server, this is Not Applicable. To verify that the system is configured to enforce multi-factor authentication, run the following commands: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep enforceSmartCard If the results do not show the following, this is a finding. "enforceSmartCard=1. Run the following command to disable password based authentication in SSHD. /usr/bin/grep -e ^[\#]*PasswordAuthentication.* -e ^[\#]*ChallengeResponseAuthentication.* /etc/ssh/sshd_config If this command returns null, or anything other than exactly this text, with no leading hash(#), this is a finding: "PasswordAuthentication no ChallengeResponseAuthentication no"

Fix: F-9874r466277_fix

For non directory bound systems, this setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system. The following commands must be run to disable passcode based authentication for SSHD: /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*ChallengeResponseAuthentication.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config

b

The macOS system must use multifactor authentication in the establishment of nonlocal maintenance and diagnostic sessions.

MA-4 - Medium - CCI-000877 - V-209624 - SV-209624r507076_rule

RMF Control

MA-4

Severity

M

CCI

CCI-000877

Version

AOSX-14-003024

Vuln IDs

V-209624
V-95977

Rule IDs

SV-209624r507076_rule
SV-105115

If maintenance tools are used by unauthorized personnel, they may accidentally or intentionally damage or compromise the system. The act of managing systems and applications includes the ability to access sensitive application information, such as system configuration details, diagnostic information, user information, and potentially sensitive application data. Some maintenance and test tools are either standalone devices with their own operating systems or are applications bundled with an operating system. Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the Internet) or an internal network. Typically, strong authentication requires authenticators that are resistant to replay attacks and employ multifactor authentication. Strong authenticators include, for example, PKI where certificates are stored on a token protected by a password, passphrase, or biometric.

Checks: C-9875r466285_chk

If the system is connected to a directory server, this is Not Applicable. The following command ensures that a mandatory smart card policy is enforced: # /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep enforceSmartCard enforceSmartCard=1 If the command returns null, or any other value, this is a finding. The following command ensures that passwords are disabled in the SSHD configuration file: # grep -e ^[\#]*PasswordAuthentication.* -e ^[\#]*ChallengeResponseAuthentication.* /etc/ssh/sshd_config If this command returns null, or anything other than exactly this text, with no leading hash(#), this is a finding: "PasswordAuthentication no ChallengeResponseAuthentication no"

Fix: F-9875r466286_fix

For non-directory bound systems, this setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system. To ensure that passcode based logins are disabled in sshd, run the following command: /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*ChallengeResponseAuthentication.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config

b

The macOS system must implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.

IA-2 - Medium - CCI-001948 - V-209625 - SV-209625r507076_rule

RMF Control

IA-2

Severity

M

CCI

CCI-001948

Version

AOSX-14-003025

Vuln IDs

V-209625
V-95979

Rule IDs

SV-209625r507076_rule
SV-105117

Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Requires further clarification from NIST.

Checks: C-9876r282357_chk

The following command ensures that a mandatory smart card policy is enforced: # /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep enforceSmartCard If the return is not "enforceSmartCard = 1;" this is a finding.

Fix: F-9876r282358_fix

This setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system.

b

The macOS system must be configured so that the login command requires smart card authentication.

CM-6 - Medium - CCI-000366 - V-209626 - SV-209626r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-003050

Vuln IDs

V-209626
V-95981

Rule IDs

SV-209626r507076_rule
SV-105119

Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.

Checks: C-9877r466321_chk

To verify that the "login" command has been configured to require smart card authentication, run the following command: # cat /etc/pam.d/login | grep -i pam_smartcard.so If the text that returns does not include the line, "auth sufficient pam_smartcard.so" at the TOP of the listing, this is a finding.

Fix: F-9877r466322_fix

Make a backup of the PAM LOGIN settings using the following command: sudo cp /etc/pam.d/login /etc/pam.d/login_backup_`date "+%Y-%m-%d_%H:%M"` Replace the contents of "/etc/pam.d/login" with the following: # login: auth account password session auth sufficient pam_smartcard.so auth optional pam_krb5.so use_kcminit auth optional pam_ntlm.so try_first_pass auth optional pam_mount.so try_first_pass auth required pam_opendirectory.so try_first_pass auth required pam_deny.so account required pam_nologin.so account required pam_opendirectory.so password required pam_opendirectory.so session required pam_launchd.so session required pam_uwtmp.so session optional pam_mount.so

b

The macOS system must be configured so that the su command requires smart card authentication.

CM-6 - Medium - CCI-000366 - V-209627 - SV-209627r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-003051

Vuln IDs

V-209627
V-95983

Rule IDs

SV-209627r507076_rule
SV-105121

Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.

Checks: C-9878r466324_chk

To verify that the "su" command has been configured to require smart card authentication, run the following command: cat /etc/pam.d/su | grep -i pam_smartcard.so If the text that returns does not include the line, "auth sufficient pam_smartcard.so" at the TOP of the listing, this is a finding.

Fix: F-9878r466325_fix

Make a backup of the PAM SU settings using the following command: cp /etc/pam.d/su /etc/pam.d/su_backup_`date "+%Y-%m-%d_%H:%M"` Replace the contents of "/etc/pam.d/login" with the following: # su: auth account session auth sufficient pam_smartcard.so #auth required pam_opendirectory.so auth required pam_deny.so account required pam_permit.so password required pam_deny.so session required pam_permit.so

b

The macOS system must be configured so that the sudo command requires smart card authentication.

CM-6 - Medium - CCI-000366 - V-209628 - SV-209628r507076_rule

RMF Control

CM-6

Severity

M

CCI

Version

AOSX-14-003052

Vuln IDs

V-209628
V-95985

Rule IDs

SV-209628r507076_rule
SV-105123

Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.

Checks: C-9879r466327_chk

To verify that the "sudo" command has been configured to require smart card authentication, run the following command: cat /etc/pam.d/sudo | grep -i pam_smartcard.so If the text that returns does not include the line, "auth sufficient pam_smartcard.so" at the TOP of the listing, this is a finding.

Fix: F-9879r466328_fix

Make a backup of the PAM SUDO settings using the following command: cp /etc/pam.d/login /etc/pam.d/sudo_backup_`date "+%Y-%m-%d_%H:%M"` Replace the contents of "/etc/pam.d/login" with the following: # sudo: auth account password session auth sufficient pam_smartcard.so #auth required pam_opendirectory.so auth required pam_deny.so account required pam_permit.so password required pam_deny.so session required pam_permit.so

b

The macOS system must be configured with system log files owned by root and group-owned by wheel or admin.

SI-11 - Medium - CCI-001314 - V-209629 - SV-209629r507076_rule

RMF Control

SI-11

Severity

M

CCI

CCI-001314

Version

AOSX-14-004001

Vuln IDs

V-209629
V-95987

Rule IDs

SV-209629r507076_rule
SV-105125

System logs should only be readable by root or admin users. System logs frequently contain sensitive information that could be used by an attacker. Setting the correct owner mitigates this risk.

Checks: C-9880r466291_chk

Log files are controlled by "newsyslog" and "aslmanager". These commands check for log files that exist on the system and print out the log with corresponding ownership. Run them from inside "/var/log": /usr/bin/sudo stat -f '%Su:%Sg:%N' $(/usr/bin/grep -v '^#' /etc/newsyslog.conf | awk '{ print $1 }') 2> /dev/null /usr/bin/sudo stat -f '%Su:%Sg:%N' $(/usr/bin/grep -e '^>' /etc/asl.conf /etc/asl/* | awk '{ print $2 }') 2> /dev/null If there are any system log files that are not owned by "root" and group-owned by "wheel" or admin, this is a finding. Service logs may be owned by the service user account or group.

Fix: F-9880r466292_fix

For any log file that returns an incorrect owner or group value, run the following command: /usr/bin/sudo chown root:wheel [log file] [log file] is the full path to the log file in question. If the file is managed by "newsyslog", find the configuration line in the directory "/etc/newsyslog.d/" or the file "/etc/newsyslog.conf" and ensure that the owner:group column is set to "root:wheel" or the appropriate service user account and group. If the file is managed by "aslmanager", find the configuration line in the directory "/etc/asl/" or the file "/etc/asl.conf" and ensure that "uid" and "gid" options are either not present or are set to a service user account and group respectively.

b

The macOS system must be configured with system log files set to mode 640 or less permissive.

SI-11 - Medium - CCI-001314 - V-209630 - SV-209630r507076_rule

RMF Control

SI-11

Severity

M

CCI

CCI-001314

Version

AOSX-14-004002

Vuln IDs

V-209630
V-95989

Rule IDs

SV-209630r507076_rule
SV-105127

System logs should only be readable by root or admin users. System logs frequently contain sensitive information that could be used by an attacker. Setting the correct permissions mitigates this risk.

Checks: C-9881r466294_chk

These commands check for log files that exist on the system and print out the log with corresponding permissions. Run them from inside "/var/log": /usr/bin/sudo stat -f '%A:%N' $(/usr/bin/grep -v '^#' /etc/newsyslog.conf | awk '{ print $1 }') 2> /dev/null /usr/bin/sudo stat -f '%A:%N' $(/usr/bin/grep -e '^>' /etc/asl.conf /etc/asl/* | awk '{ print $2 }') 2> /dev/null The correct permissions on log files should be "640" or less permissive for system logs. Any file with more permissive settings is a finding.

Fix: F-9881r466295_fix

For any log file that returns an incorrect permission value, run the following command: /usr/bin/sudo chmod 640 [log file] [log file] is the full path to the log file in question. If the file is managed by "newsyslog", find the configuration line in the directory "/etc/newsyslog.d/" or the file "/etc/newsyslog.conf" and edit the mode column to be "640" or less permissive. If the file is managed by "aslmanager", find the configuration line in the directory "/etc/asl/" or the file "/etc/asl.conf" and add or edit the mode option to be "mode=0640" or less permissive.

b

The macOS system must authenticate all endpoint devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.

IA-3 - Medium - CCI-001967 - V-209633 - SV-209633r507076_rule

RMF Control

IA-3

Severity

M

CCI

CCI-001967

Version

AOSX-14-004020

Vuln IDs

V-209633
V-95585

Rule IDs

SV-209633r507076_rule
SV-104731

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk. Bidirectional authentication solutions include, but are not limited to, IEEE 802.1x and Extensible Authentication Protocol [EAP], RADIUS server with EAP-Transport Layer Security [TLS] authentication, Kerberos, and SSL mutual authentication. A local connection is any connection with a device communicating without the use of a network. A network connection is any connection with a device that communicates through a network (e.g., local area network, wide area network, or the Internet). A remote connection is any connection with a device communicating through an external network (e.g., the Internet). Because of the challenges of applying this requirement on a large scale, organizations are encouraged to only apply this requirement to those limited number (and type) of devices that truly need to support this capability.

Checks: C-9884r282381_chk

For systems where Wi-Fi is not approved for use, run the following command to disable the Wi-Fi service: To list the network devices that are enabled on the system, run the following command: /usr/bin/sudo /usr/sbin/networksetup -listallnetworkservices If the Wi-Fi service name is not preceded by an asterisk(*), this is a finding.

Fix: F-9884r282382_fix

To disable a network device, run the following command: /usr/bin/sudo /usr/sbin/networksetup -setnetworkserviceenabled Wi-Fi off

c

The macOS system must be configured with the sudoers file configured to authenticate users on a per -tty basis.

CM-6 - High - CCI-000366 - V-209634 - SV-209634r507076_rule

RMF Control

CM-6

Severity

H

CCI

Version

AOSX-14-004021

Vuln IDs

V-209634
V-95587

Rule IDs

SV-209634r507076_rule
SV-104733

The "sudo" command must be configured to prompt for the administrator's password at least once in each newly opened Terminal window or remote logon session, as this prevents a malicious user from taking advantage of an unlocked computer or an abandoned logon session to bypass the normal password prompt requirement. Without the "tty_tickets" option, all open local and remote logon sessions would be authenticated to use sudo without a password for the duration of the configured password timeout window.

Checks: C-9885r282384_chk

To check if the "tty_tickets" option is set for "/usr/bin/sudo", run the following command: /usr/bin/sudo /usr/bin/grep tty_tickets /etc/sudoers If there is no result, this is a finding.

Fix: F-9885r282385_fix

Edit the "/etc/sudoers" file to contain the line: Defaults tty_tickets This line can be placed in the defaults section or at the end of the file.

b

The macOS system must enable System Integrity Protection.

AU-9 - Medium - CCI-001493 - V-209635 - SV-209635r507076_rule

RMF Control

AU-9

Severity

M

CCI

CCI-001493

Version

AOSX-14-005001

Vuln IDs

V-209635
V-95995

Rule IDs

SV-209635r507076_rule
SV-105133

System Integrity Protection (SIP) is vital to the protection of the integrity of macOS. SIP restricts what actions can be performed by administrative users, including root, against protected parts of the operating system. SIP protects all system binaries, including audit tools, from unauthorized access by preventing the modification or deletion of system binaries, or the changing of the permissions associated with those binaries. SIP limits the privileges to change software resident within software libraries to processes that have signed by Apple and have special entitlements to write to system files, such as Apple software updates and Apple installers. By protecting audit binaries, SIP ensures the presence of an audit record generation capability for DoD-defined auditable events for all operating system components and supports on-demand and after-the-fact reporting requirements. Satisfies: SRG-OS-000051-GPOS-00024, SRG-OS-000054-GPOS-00025, SRG-OS-000062-GPOS-00031, SRG-OS-000122-GPOS-00063, SRG-OS-000256-GPOS-00097, SRG-OS-000257-GPOS-00098, SRG-OS-000258-GPOS-00099, SRG-OS-000259-GPOS-00100, SRG-OS-000348-GPOS-00136, SRG-OS-000349-GPOS-00137, SRG-OS-000350-GPOS-00138, SRG-OS-000351-GPOS-00139, SRG-OS-000352-GPOS-00140, SRG-OS-000353-GPOS-00141, SRG-OS-000354-GPOS-00142

Checks: C-9886r282387_chk

System Integrity Protection is a security feature, enabled by default, that protects certain system processes and files from being modified or tampered with. Check the current status of "System Integrity Protection" with the following command: /usr/bin/csrutil status If the result does not show the following, this is a finding. System Integrity Protection status: enabled

Fix: F-9886r282388_fix

To reenable "System Integrity Protection", boot the affected system into "Recovery" mode, launch "Terminal" from the "Utilities" menu, and run the following command: /usr/bin/csrutil enable

b

The macOS system must implement cryptographic mechanisms to protect the confidentiality and integrity of all information at rest.

SC-28 - Medium - CCI-001199 - V-209636 - SV-209636r507076_rule

RMF Control

SC-28

Severity

M

CCI

CCI-001199

Version

AOSX-14-005020

Vuln IDs

V-209636
V-95997

Rule IDs

SV-209636r507076_rule
SV-105135

Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and tape drive) within an organizational information system. Mobile devices, laptops, desktops, and storage devices can be lost or stolen, and the contents of their data storage (e.g., hard drives and non-volatile memory) can be read, copied, or altered. By encrypting the system hard drive, the confidentiality and integrity of any data stored on the system is ensured. FileVault Disk Encryption mitigates this risk. Satisfies: SRG-OS-000185-GPOS-00079, SRG-OS-000404-GPOS-00183, SRG-OS-000405-GPOS-00184

Checks: C-9887r466288_chk

To check if "FileVault 2" is enabled, run the following command: /usr/bin/sudo /usr/bin/fdesetup status If "FileVault" is "Off" and the device is a mobile device or the organization has determined that the drive must encrypt data at rest, this is a finding.

Fix: F-9887r466289_fix

Open System Preferences >> Security and Privacy and navigate to the "FileVault" tab. Use this panel to configure full-disk encryption. Alternately, from the command line, run the following command to enable "FileVault": /usr/bin/sudo /usr/bin/fdesetup enable After "FileVault" is initially set up, additional users can be added.

b

The macOS Application Firewall must be enabled.

CM-6 - Medium - CCI-000366 - V-209637 - SV-209637r507076_rule

RMF Control

CM-6

Severity

M

CCI