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Apple macOS 12 (Monterey) Security Technical Implementation Guide

  • Version/Release: V1R8
  • Published: 2023-08-28
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This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DOD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.
b
The macOS system must be configured to prevent Apple Watch from terminating a session lock.
AC-11 - Medium - CCI-000056 - V-252436 - SV-252436r816122_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000056
Version
APPL-12-000001
Vuln IDs
  • V-252436
Rule IDs
  • SV-252436r816122_rule
Users must be prompted to enter their passwords when unlocking the screen saver. The screen saver acts as a session lock and prevents unauthorized users from accessing the current user's account.
Checks: C-55892r816120_chk

To check if the system is configured to prevent Apple Watch from terminating a session lock, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep "allowAutoUnlock" allowAutoUnlock = 0; If there is no result or "allowAutoUnlock" is not set to "0", this is a finding.

Fix: F-55842r816121_fix

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

b
The macOS system must retain the session lock until the user reestablishes access using established identification and authentication procedures.
AC-11 - Medium - CCI-000056 - V-252437 - SV-252437r816125_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000056
Version
APPL-12-000002
Vuln IDs
  • V-252437
Rule IDs
  • SV-252437r816125_rule
Users must be prompted to enter their passwords when unlocking the screen saver. The screen saver acts as a session lock and prevents unauthorized users from accessing the current user's account.
Checks: C-55893r816123_chk

To check if the system will prompt users to enter their passwords to unlock the screen saver, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep askForPassword If there is no result, or if "askForPassword" is not set to "1", this is a finding.

Fix: F-55843r816124_fix

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

b
The macOS system must initiate the session lock no more than five seconds after a screen saver is started.
AC-11 - Medium - CCI-000056 - V-252438 - SV-252438r877365_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000056
Version
APPL-12-000003
Vuln IDs
  • V-252438
Rule IDs
  • SV-252438r877365_rule
A screen saver must be enabled and set to require a password to unlock. An excessive grace period impacts the ability for a session to be truly locked, requiring authentication to unlock.
Checks: C-55894r877364_chk

To check if the system will prompt users to enter their passwords to unlock the screen saver, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep askForPasswordDelay If there is no result, or if "askForPasswordDelay" is not set to "5" or less, this is a finding.

Fix: F-55844r816127_fix

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

b
The macOS system must initiate a session lock after a 15-minute period of inactivity.
AC-11 - Medium - CCI-000057 - V-252439 - SV-252439r816131_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000057
Version
APPL-12-000004
Vuln IDs
  • V-252439
Rule IDs
  • SV-252439r816131_rule
A screen saver must be enabled and set to require a password to unlock. The timeout should be set to 15 minutes of inactivity. This mitigates the risk that a user might forget to manually lock the screen before stepping away from the computer. A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.
Checks: C-55895r816129_chk

To check if the system has a configuration profile configured to enable the screen saver after a time-out period, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep loginWindowIdleTime If there is no result, or if "loginWindowIdleTime" is not set to "900" seconds or less, this is a finding.

Fix: F-55845r816130_fix

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

b
The macOS system must be configured to lock the user session when a smart token is removed.
AC-11 - Medium - CCI-000058 - V-252440 - SV-252440r816134_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000058
Version
APPL-12-000005
Vuln IDs
  • V-252440
Rule IDs
  • SV-252440r816134_rule
A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Rather than be forced to wait for a period of time to expire before the user session can be locked, operating systems need to provide users with the ability to manually invoke a session lock so users may secure their session should they need to temporarily vacate the immediate physical vicinity.
Checks: C-55896r816132_chk

To check if support for session locking with removal of a token is enabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep "tokenRemovalAction = 1;" If there is no result, this is a finding.

Fix: F-55846r816133_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.

a
The macOS system must conceal, via the session lock, information previously visible on the display with a publicly viewable image.
AC-11 - Low - CCI-000060 - V-252441 - SV-252441r816137_rule
RMF Control
AC-11
Severity
Low
CCI
CCI-000060
Version
APPL-12-000006
Vuln IDs
  • V-252441
Rule IDs
  • SV-252441r816137_rule
A default screen saver must be configured for all users, as the screen saver will act as a session time-out lock for the system and must conceal the contents of the screen from unauthorized users. The screen saver must not display any sensitive information or reveal the contents of the locked session screen. Publicly viewable images can include static or dynamic images such as patterns used with screen savers, photographic images, solid colors, a clock, a battery life indicator, or a blank screen.
Checks: C-55897r816135_chk

To view the currently selected screen saver for the logged-on user, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep loginWindowModulePath If there is no result or defined "modulePath", this is a finding.

Fix: F-55847r816136_fix

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

b
The macOS system must be configured to disable hot corners.
AC-11 - Medium - CCI-000060 - V-252442 - SV-252442r816140_rule
RMF Control
AC-11
Severity
Medium
CCI
CCI-000060
Version
APPL-12-000007
Vuln IDs
  • V-252442
Rule IDs
  • SV-252442r816140_rule
Although hot corners can be used to initiate a session lock or launch useful applications, they can also be configured to disable an automatic session lock from initiating. Such a configuration introduces the risk that a user might forget to manually lock the screen before stepping away from the computer.
Checks: C-55898r816138_chk

To check if the system is configured to disable hot corners, run the following commands: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep wvous If the return is null, or does not equal: "wvous-bl-corner = 0 wvous-br-corner = 0; wvous-tl-corner = 0; wvous-tr-corner = 0;" this is a finding.

Fix: F-55848r816139_fix

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

b
The macOS system must automatically remove or disable temporary and emergency user accounts after 72 hours.
AC-2 - Medium - CCI-001682 - V-252444 - SV-252444r816146_rule
RMF Control
AC-2
Severity
Medium
CCI
CCI-001682
Version
APPL-12-000012
Vuln IDs
  • V-252444
Rule IDs
  • SV-252444r816146_rule
If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be targeted by attackers to gain unauthorized access. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation. Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. If temporary accounts are used, the operating system must be configured to automatically terminate these types of accounts after a DoD-defined time period of 72 hours. Emergency administrator accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency administrator accounts are different from infrequently used accounts (i.e., local logon accounts used by system administrators when network or normal logon/access is not available). Infrequently used accounts also remain available and are not subject to automatic termination dates. However, an emergency administrator account is normally a different account created for use by vendors or system maintainers. To address access requirements, many operating systems may be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000002-GPOS-00002, SRG-OS-000123-GPOS-00064
Checks: C-55900r816144_chk

Verify if a password policy is enforced by a directory service by asking the System Administrator (SA) or Information System Security Officer (ISSO). If no policy is enforced by a directory service, a password policy can be set with the "pwpolicy" utility. The variable names may vary depending on how the policy was set. If there are no temporary or emergency accounts defined on the system, this is Not Applicable. To check if the password policy is configured to disable a temporary or emergency account after 72 hours, run the following command to output the password policy to the screen, substituting the correct user name in place of username: /usr/bin/sudo /usr/bin/pwpolicy -u username getaccountpolicies | tail -n +2 If there is no output, and password policy is not controlled by a directory service, this is a finding. Otherwise, look for the line "<key>policyCategoryAuthentication</key>". In the array that follows, there should be a <dict> section that contains a check <string> that allows users to log in if "policyAttributeCurrentTime" is less than the result of adding "policyAttributeCreationTime" to 72 hours (259299 seconds). 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 to "policyAttributeCreationTime", this is a finding.

Fix: F-55850r816450_fix

This setting may be enforced using local policy or by a directory service. To set local policy to disable a temporary or emergency user, create a plain text file containing the following: <dict> <key>policyCategoryAuthentication</key> <array> <dict> <key>policyContent</key> <string>policyAttributeCurrentTime &lt; policyAttributeCreationTime+259299</string> <key>policyIdentifier</key> <string>Disable Tmp Accounts </string> </dict> </array> </dict> After saving the file and exiting to the command prompt, run the following command to load the new policy file, substituting the correct user name in place of "username" and the path to the file in place of "/path/to/file". /usr/bin/sudo /usr/bin/pwpolicy -u username setaccountpolicies /path/to/file

b
The macOS system must, for networked systems, compare internal information system clocks at least every 24 hours with a server that is synchronized to one of the redundant United States Naval Observatory (USNO) time servers or a time server designated for the appropriate DoD network (NIPRNet/SIPRNet) and/or the Global Positioning System (GPS).
AU-8 - Medium - CCI-002046 - V-252445 - SV-252445r877038_rule
RMF Control
AU-8
Severity
Medium
CCI
CCI-002046
Version
APPL-12-000014
Vuln IDs
  • V-252445
Rule IDs
  • SV-252445r877038_rule
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside of the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144
Checks: C-55901r816147_chk

The TIMED (NTP replacement in Big Sur) service must be enabled on all networked systems. To check if the service is running, use the following command: sudo systemsetup -getusingnetworktime If the following in not returned, this is a finding: Network Time: On To verify that an authorized Time Server is configured, run the following command: sudo systemsetup -getnetworktimeserver Only approved time servers should be configured for use. If no server is configured, or if an unapproved time server is in use, this is a finding.

Fix: F-55851r816148_fix

To enable the TIMED service, run the following command: /usr/bin/sudo systemsetup -setusingnetworktime on To configure a time server, use the following command: /usr/bin/sudo systemsetup -setnetworktimeserver "server"

b
The macOS system must utilize an ESS solution and implement all DoD required modules.
SI-2 - Medium - CCI-001233 - V-252446 - SV-252446r816152_rule
RMF Control
SI-2
Severity
Medium
CCI
CCI-001233
Version
APPL-12-000015
Vuln IDs
  • V-252446
Rule IDs
  • SV-252446r816152_rule
The macOS system must employ automated mechanisms to determine the state of system components. The DoD requires the installation and use of an approved HBSS solution to be implemented on the operating system. For additional information, reference all applicable HBSS OPORDs and FRAGOs on SIPRNET.
Checks: C-55902r816150_chk

Verify that there is an approved ESS solution installed on the system. If there is not an approved ESS solution installed, this is a finding. Verify that all installed components of the ESS Solution are at the DoD approved minimal version. If the installed components are not at the DoD approved minimal versions, this is a finding.

Fix: F-55852r816151_fix

Install an approved ESS solution onto the system and ensure that all components are at least updated to their DoD approved minimal versions.

c
The macOS system must be integrated into a directory services infrastructure.
CM-6 - High - CCI-000366 - V-252447 - SV-252447r816155_rule
RMF Control
CM-6
Severity
High
CCI
CCI-000366
Version
APPL-12-000016
Vuln IDs
  • V-252447
Rule IDs
  • SV-252447r816155_rule
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-55903r816153_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, run the following command: /usr/bin/dscl localhost -list . | /usr/bin/grep "Active Directory" If no results are returned, this is a finding.

Fix: F-55853r816154_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 before the user account is locked.
AC-7 - Medium - CCI-002238 - V-252448 - SV-252448r853260_rule
RMF Control
AC-7
Severity
Medium
CCI
CCI-002238
Version
APPL-12-000022
Vuln IDs
  • V-252448
Rule IDs
  • SV-252448r853260_rule
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-55904r816156_chk

Password policy is set with the Passcode Policy configuration profile. /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.

Fix: F-55854r816157_fix

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

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-252449 - SV-252449r816161_rule
RMF Control
AC-8
Severity
Medium
CCI
CCI-000048
Version
APPL-12-000023
Vuln IDs
  • V-252449
Rule IDs
  • SV-252449r816161_rule
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-55905r816159_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-55855r816160_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-252450 - SV-252450r858503_rule
RMF Control
AC-8
Severity
Medium
CCI
CCI-000048
Version
APPL-12-000024
Vuln IDs
  • V-252450
Rule IDs
  • SV-252450r858503_rule
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-55906r858502_chk

If SSH is not being used, this is Not Applicable. 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 -r Banner /etc/ssh/sshd_config* Banner /etc/banner If the sshd Banner configuration option does not point to "/etc/banner", this is a finding. If conflicting results are returned, this is a finding.

Fix: F-55856r816163_fix

For systems that allow remote access through SSH run the following command: # /usr/bin/sudo /usr/bin/sed -i.bak 's/^#Banner.*/Banner \/etc\/banner/' /etc/ssh/sshd_config

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-252451 - SV-252451r816167_rule
RMF Control
AC-8
Severity
Medium
CCI
CCI-000048
Version
APPL-12-000025
Vuln IDs
  • V-252451
Rule IDs
  • SV-252451r816167_rule
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-55907r816165_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-55857r816166_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-252452 - SV-252452r816170_rule
RMF Control
SI-11
Severity
Medium
CCI
CCI-001314
Version
APPL-12-000030
Vuln IDs
  • V-252452
Rule IDs
  • SV-252452r816170_rule
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-55908r816168_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-55858r816169_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-252453 - SV-252453r816173_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-000031
Vuln IDs
  • V-252453
Rule IDs
  • SV-252453r816173_rule
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-55909r816171_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-55859r816172_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 be configured with dedicated user accounts to decrypt the hard disk upon startup.
AC-2 - Medium - CCI-002143 - V-252454 - SV-252454r853262_rule
RMF Control
AC-2
Severity
Medium
CCI
CCI-002143
Version
APPL-12-000032
Vuln IDs
  • V-252454
Rule IDs
  • SV-252454r853262_rule
When "FileVault" and Multifactor Authentication are configured on the operating system, a dedicated user must be configured to ensure that the implemented Multifactor Authentication rules are enforced. If a dedicated user is not configured to decrypt the hard disk upon startup, the system will allow a user to bypass Multifactor Authentication rules during initial startup and first login.
Checks: C-55910r816174_chk

For Apple Silicon-based systems, this is Not Applicable. For Intel-based Macs, retrieve a list of authorized FileVault users: $ sudo fdesetup list fvuser,85F41F44-22B3-6CB7-85A1-BCC2EA2B887A If any unauthorized users are listed, this is a finding. Verify that the shell for authorized FileVault users is set to “/usr/bin/false”, which prevents console logins: $ sudo dscl . read /Users/&lt;FileVault_User&gt; UserShell UserShell: /usr/bin/false If the FileVault users' shell is not set to "/usr/bin/false", this is a finding.

Fix: F-55860r853261_fix

Note: In previous versions of macOS, this setting was implemented differently. Systems that used the previous method should prepare the system for the new method by creating a new unlock user, verifying its ability to unlock FileVault after reboot, then deleting the old FileVault unlock user. Disable the login ability of the newly created user account: $ sudo /usr/bin/dscl . change /Users/<FileVault_User> UserShell </path/to/current/shell> /usr/bin/false Remove all FileVault login access from each user account defined on the system that is not a designated FileVault user: $ sudo fdesetup remove -user <username>

b
The macOS system must be configured to disable password forwarding for FileVault2.
AC-2 - Medium - CCI-002143 - V-252455 - SV-252455r853263_rule
RMF Control
AC-2
Severity
Medium
CCI
CCI-002143
Version
APPL-12-000033
Vuln IDs
  • V-252455
Rule IDs
  • SV-252455r853263_rule
When "FileVault" and Multifactor Authentication are configured on the operating system, a dedicated user must be configured to ensure that the implemented Multifactor Authentication rules are enforced. If a dedicated user is not configured to decrypt the hard disk upon startup, the system will allow a user to bypass Multifactor Authentication rules during initial startup and first login.
Checks: C-55911r816177_chk

Verify that password forwarding has been disabled on the system: # /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep "DisableFDEAutoLogin" DisableFDEAutologin = 1; If "DisableFDEAutologin" is not set to a value of "1", this is a finding.

Fix: F-55861r816178_fix

This setting is enforced using the "Smart Card" configuration profile.

b
The macOS system must be configured with the SSH daemon ClientAliveInterval option set to 900 or less.
SC-10 - Medium - CCI-001133 - V-252456 - SV-252456r891341_rule
RMF Control
SC-10
Severity
Medium
CCI
CCI-001133
Version
APPL-12-000051
Vuln IDs
  • V-252456
Rule IDs
  • SV-252456r891341_rule
Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a communication session. In addition, quickly terminating an idle session or an incomplete logon attempt will also free up resources committed by the managed network element. SSH options ClientAliveInterval and ClientAliveCountMax are used in combination to monitor SSH connections. If an SSH client is deemed unresponsive, sshd will terminate the connection. An example would be if a client lost network connectivity the SSH connection to the server would be unresponsive, and therefore sshd would terminate the connection after the ClientAliveCountMax and ClientAliveInterval thresholds have been met. The ClientAliveInterval is a timeout measured in seconds. After which if no data is received from the client, sshd will request a response through the encrypted tunnel from the client. The default is 0, indicating no messages will be sent. The ClientAliveCountMax is a number of client alive messages that can be sent from the server without receiving a reply from the client. If this threshold is met, sshd will terminate the session. Setting the ClientAliveCountMax to 0 disables connection termination.
Checks: C-55912r891340_chk

If SSH is not being used, this is Not Applicable. The SSH daemon "ClientAliveInterval" option must be set correctly. To check the idle timeout setting for SSH sessions, run the following: /usr/bin/grep -r ^ClientAliveInterval /etc/ssh/sshd_config* If "ClientAliveInterval" is not configured or has a value of "0", this is a finding. If "ClientAliveInterval" is not "900" or less, this is a finding. If conflicting results are returned, this is a finding.

Fix: F-55862r816181_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 1.
SC-10 - Medium - CCI-001133 - V-252457 - SV-252457r891344_rule
RMF Control
SC-10
Severity
Medium
CCI
CCI-001133
Version
APPL-12-000052
Vuln IDs
  • V-252457
Rule IDs
  • SV-252457r891344_rule
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. SSH options ClientAliveInterval and ClientAliveCountMax are used in combination to monitor SSH connections. If an SSH client is deemed unresponsive, sshd will terminate the connection. An example would be if a client lost network connectivity the SSH connection to the server would be unresponsive, and therefore sshd would terminate the connection after the ClientAliveCountMax and ClientAliveInterval thresholds have been met. The ClientAliveInterval is a timeout measured in seconds. After which if no data is received from the client, sshd will request a response through the encrypted tunnel from the client. The default is 0, indicating no messages will be sent. The ClientAliveCountMax is a number of client alive messages that can be sent from the server without receiving a reply from the client. If this threshold is met, sshd will terminate the session. Setting the ClientAliveCountMax to 0 disables connection termination.
Checks: C-55913r891342_chk

If SSH is not being used, this is Not Applicable. 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/grep -r ^ClientAliveCountMax /etc/ssh/sshd_config* If the setting is not "ClientAliveCountMax 1", this is a finding. If conflicting results are returned, this is a finding.

Fix: F-55863r891343_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 1/' /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-252458 - SV-252458r858509_rule
RMF Control
SC-10
Severity
Medium
CCI
CCI-001133
Version
APPL-12-000053
Vuln IDs
  • V-252458
Rule IDs
  • SV-252458r858509_rule
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-55914r858508_chk

If SSH is not being used, this is Not Applicable. 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/grep -r ^LoginGraceTime /etc/ssh/sshd_config* If the value is not set to "30" or less, this is a finding. If conflicting results are returned, this is a finding.

Fix: F-55864r816187_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

c
The macOS system must implement approved ciphers within the SSH server configuration to protect the confidentiality of SSH connections.
IA-7 - High - CCI-000803 - V-252459 - SV-252459r922855_rule
RMF Control
IA-7
Severity
High
CCI
CCI-000803
Version
APPL-12-000054
Vuln IDs
  • V-252459
Rule IDs
  • SV-252459r922855_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS-validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174
Checks: C-55915r922853_chk

Verify the macOS system is configured to use approved SSH ciphers within the SSH server configuration with the following command: /usr/bin/sudo /usr/sbin/sshd -T | /usr/bin/grep "ciphers" ciphers aes128-gcm@openssh.com If any ciphers other than "aes128-gcm@openssh.com" are listed, or the "ciphers" keyword is missing, this is a finding.

Fix: F-55865r922854_fix

Configure the macOS system to use approved SSH ciphers by creating a plain text file in the /private/etc/ssh/sshd_config.d/ directory containing the following: Ciphers aes128-gcm@openssh.com The SSH service must be restarted for changes to take effect.

c
The macOS system must implement approved Message Authentication Codes (MACs) within the SSH server configuration.
AC-17 - High - CCI-000068 - V-252460 - SV-252460r922858_rule
RMF Control
AC-17
Severity
High
CCI
CCI-000068
Version
APPL-12-000055
Vuln IDs
  • V-252460
Rule IDs
  • SV-252460r922858_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00175
Checks: C-55916r922856_chk

Verify the macOS system is configured to use approved SSH MACs within the SSH server configuration with the following command: /usr/bin/sudo /usr/sbin/sshd -T | /usr/bin/grep "macs" macs hmac-sha2-256 If any hashes other than "hmac-sha2-256" are listed, or the "macs" keyword is missing, this is a finding.

Fix: F-55866r922857_fix

Configure the macOS system to use approved SSH MACs by creating a plain text file in the /private/etc/ssh/sshd_config.d/ directory containing the following: MACs hmac-sha2-256 The SSH service must be restarted for changes to take effect.

c
The macOS system must implement approved Key Exchange Algorithms within the SSH server configuration.
IA-7 - High - CCI-000803 - V-252461 - SV-252461r922861_rule
RMF Control
IA-7
Severity
High
CCI
CCI-000803
Version
APPL-12-000056
Vuln IDs
  • V-252461
Rule IDs
  • SV-252461r922861_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00176
Checks: C-55917r922859_chk

Verify the macOS system is configured to use approved SSH Key Exchange Algorithms within the SSH server configuration with the following command: /usr/bin/sudo /usr/sbin/sshd -T | /usr/bin/grep "kexalgorithms" kexalgorithms ecdh-sha2-nistp256 If any algorithms other than "ecdh-sha2-nistp256" are listed, or the "kexalgorithms" keyword is missing, this is a finding.

Fix: F-55867r922860_fix

Configure the macOS system to use approved SSH Key Exchange Algorithms by creating a plain text file in the /private/etc/ssh/sshd_config.d/ directory containing the following: KexAlgorithms ecdh-sha2-nistp256 The SSH service must be restarted for changes to take effect.

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-000018 - V-252462 - SV-252462r853271_rule
RMF Control
AC-2
Severity
Medium
CCI
CCI-000018
Version
APPL-12-001001
Vuln IDs
  • V-252462
Rule IDs
  • SV-252462r853271_rule
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-55918r816198_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-55868r853270_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-252463 - SV-252463r816463_rule
RMF Control
AU-12
Severity
Medium
CCI
CCI-000172
Version
APPL-12-001002
Vuln IDs
  • V-252463
Rule IDs
  • SV-252463r816463_rule
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-55919r816201_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-55869r816462_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-8 - Medium - CCI-000159 - V-252464 - SV-252464r853272_rule
RMF Control
AU-8
Severity
Medium
CCI
CCI-000159
Version
APPL-12-001003
Vuln IDs
  • V-252464
Rule IDs
  • SV-252464r853272_rule
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-55920r816204_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" =&gt; false" the audit service is disabled, and this is a finding.

Fix: F-55870r816205_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-252465 - SV-252465r816466_rule
RMF Control
AU-5
Severity
Medium
CCI
CCI-000140
Version
APPL-12-001010
Vuln IDs
  • V-252465
Rule IDs
  • SV-252465r816466_rule
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-55921r816207_chk

Verify that the audit control system is configured to shut down upon failure using 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-55871r816465_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-252466 - SV-252466r816212_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001012
Vuln IDs
  • V-252466
Rule IDs
  • SV-252466r816212_rule
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-55922r816210_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-55872r816211_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-252467 - SV-252467r816215_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001013
Vuln IDs
  • V-252467
Rule IDs
  • SV-252467r816215_rule
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-55923r816213_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-55873r816214_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-252468 - SV-252468r816218_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001014
Vuln IDs
  • V-252468
Rule IDs
  • SV-252468r816218_rule
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-55924r816216_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-55874r816217_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-252469 - SV-252469r816221_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001015
Vuln IDs
  • V-252469
Rule IDs
  • SV-252469r816221_rule
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-55925r816219_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-55875r816220_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-252470 - SV-252470r816224_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001016
Vuln IDs
  • V-252470
Rule IDs
  • SV-252470r816224_rule
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-55926r816222_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-55876r816223_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-252471 - SV-252471r816227_rule
RMF Control
AU-9
Severity
Medium
CCI
CCI-000162
Version
APPL-12-001017
Vuln IDs
  • V-252471
Rule IDs
  • SV-252471r816227_rule
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-55927r816225_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-55877r816226_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-252472 - SV-252472r853274_rule
RMF Control
AU-12
Severity
Medium
CCI
CCI-000172
Version
APPL-12-001020
Vuln IDs
  • V-252472
Rule IDs
  • SV-252472r853274_rule
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-55928r816228_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, and -fd, which audits failed file deletion. If "fm", "-fr", "-fw", and "-fd" are not listed in the result of the check, this is a finding.

Fix: F-55878r853273_fix

To set the audit flags to the recommended setting, run the following command to add the flags "fm", "-fr", "-fw", and "-fd" all at once: /usr/bin/sudo /usr/bin/sed -i.bak '/^flags/ s/$/,fm,-fr,-fw,-fd/' /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 week's worth of audit records when audit records are not immediately sent to a central audit record storage facility.
AU-4 - Medium - CCI-001849 - V-252473 - SV-252473r877391_rule
RMF Control
AU-4
Severity
Medium
CCI
CCI-001849
Version
APPL-12-001029
Vuln IDs
  • V-252473
Rule IDs
  • SV-252473r877391_rule
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-55929r816231_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-55879r853275_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-252474 - SV-252474r877389_rule
RMF Control
AU-5
Severity
Medium
CCI
CCI-001855
Version
APPL-12-001030
Vuln IDs
  • V-252474
Rule IDs
  • SV-252474r877389_rule
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-55930r816234_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-55880r853277_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-252475 - SV-252475r853279_rule
RMF Control
AU-5
Severity
Medium
CCI
CCI-001858
Version
APPL-12-001031
Vuln IDs
  • V-252475
Rule IDs
  • SV-252475r853279_rule
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-55931r816237_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-55881r816238_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-252476 - SV-252476r816474_rule
RMF Control
AU-12
Severity
Medium
CCI
CCI-000172
Version
APPL-12-001044
Vuln IDs
  • V-252476
Rule IDs
  • SV-252476r816474_rule
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-55932r816240_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-55882r816473_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.
IA-5 - Medium - CCI-000186 - V-252477 - SV-252477r853280_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-000186
Version
APPL-12-001060
Vuln IDs
  • V-252477
Rule IDs
  • SV-252477r853280_rule
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, SRG-OS-000067-GPOS-00035
Checks: C-55933r816243_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 = 1", is not equal to (1) or greater, this is a finding.

Fix: F-55883r816244_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-252478 - SV-252478r858511_rule
RMF Control
IA-2
Severity
Medium
CCI
CCI-000770
Version
APPL-12-001100
Vuln IDs
  • V-252478
Rule IDs
  • SV-252478r858511_rule
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-55934r858510_chk

If SSH is not being used, this is Not Applicable. To check if SSH has root logins enabled, run the following command: /usr/bin/grep -r ^PermitRootLogin /etc/ssh/sshd_config* If there is no result, or the result is set to "yes", this is a finding. If conflicting results are returned, this is a finding.

Fix: F-55884r816247_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-252479 - SV-252479r816251_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002001
Vuln IDs
  • V-252479
Rule IDs
  • SV-252479r816251_rule
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-55935r816249_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: /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" =&gt; true

Fix: F-55885r816250_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 the Network File System (NFS) daemon unless it is required.
CM-7 - Medium - CCI-000381 - V-252480 - SV-252480r816254_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002003
Vuln IDs
  • V-252480
Rule IDs
  • SV-252480r816254_rule
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-55936r816252_chk

If the NFS daemon is required, this is not applicable. To check if the NFS daemon is disabled, use the following command: /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" =&gt; true

Fix: F-55886r816253_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-252481 - SV-252481r816257_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002004
Vuln IDs
  • V-252481
Rule IDs
  • SV-252481r816257_rule
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-55937r816255_chk

If Location Services are authorized by the Authorizing Official, this is Not Applicable. Verify that Location Services are disabled: /usr/bin/sudo /usr/bin/defaults read /var/db/locationd/Library/Preferences/ByHost/com.apple.locationd | egrep 'LocationServicesEnabled' LocationServicesEnabled = 0 If 'LocationServicesEnabled' is not set to '0', this is a finding.

Fix: F-55887r816256_fix

Disable the Location Services by running the following command: /usr/bin/sudo /usr/bin/defaults write /var/db/locationd/Library/Preferences/ByHost/com.apple.locationd LocationServicesEnabled -bool false

b
The macOS system must be configured to disable Bonjour multicast advertising.
CM-7 - Medium - CCI-000381 - V-252482 - SV-252482r816260_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002005
Vuln IDs
  • V-252482
Rule IDs
  • SV-252482r816260_rule
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-55938r816258_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-55888r816259_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-252483 - SV-252483r816263_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002006
Vuln IDs
  • V-252483
Rule IDs
  • SV-252483r816263_rule
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-55939r816261_chk

To check if the UUCP service is disabled, use the following command: /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" =&gt; true

Fix: F-55889r816262_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-252484 - SV-252484r816266_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002007
Vuln IDs
  • V-252484
Rule IDs
  • SV-252484r816266_rule
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-55940r816264_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-55890r816265_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-252485 - SV-252485r816269_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002008
Vuln IDs
  • V-252485
Rule IDs
  • SV-252485r816269_rule
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-55941r816267_chk

To check if Web Sharing is disabled, use the following command: /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" =&gt; true

Fix: F-55891r816268_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-252486 - SV-252486r816272_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-002009
Vuln IDs
  • V-252486
Rule IDs
  • SV-252486r816272_rule
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. Note: There is a known bug in the graphical user interface where the user can toggle AirDrop in the UI, which indicates the service has been turned on, but it remains disabled if the Restrictions Profile has been applied.
Checks: C-55942r816270_chk

Verify that AirDrop has been disabled by running the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowAirDrop If the return is not, "allowAirDrop = 0", this is a finding.

Fix: F-55892r816271_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-252487 - SV-252487r853281_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-002012
Vuln IDs
  • V-252487
Rule IDs
  • SV-252487r853281_rule
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-55943r816273_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-55893r816274_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-001774 - V-252488 - SV-252488r853282_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-001774
Version
APPL-12-002013
Vuln IDs
  • V-252488
Rule IDs
  • SV-252488r853282_rule
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-55944r816276_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-55894r816277_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-252489 - SV-252489r853283_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-002014
Vuln IDs
  • V-252489
Rule IDs
  • SV-252489r853283_rule
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-55945r816279_chk

Verify that the operating system is configured to disable iCloud Address Book services using the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep allowCloudAddressBook If the result is not "allowCloudAddressBook = 0", this is a finding.

Fix: F-55895r816280_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-252490 - SV-252490r853284_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-002015
Vuln IDs
  • V-252490
Rule IDs
  • SV-252490r853284_rule
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-55946r816282_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-55896r816283_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-001774 - V-252491 - SV-252491r853285_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-001774
Version
APPL-12-002016
Vuln IDs
  • V-252491
Rule IDs
  • SV-252491r853285_rule
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-55947r816285_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-55897r816286_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-252492 - SV-252492r816982_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002017
Vuln IDs
  • V-252492
Rule IDs
  • SV-252492r816982_rule
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-55948r816981_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-55898r816289_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-252493 - SV-252493r922852_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002020
Vuln IDs
  • V-252493
Rule IDs
  • SV-252493r922852_rule
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 nonessential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. Siri and dictation must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155
Checks: C-55949r922851_chk

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

Fix: F-55899r816292_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-252494 - SV-252494r816477_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000382
Version
APPL-12-002021
Vuln IDs
  • V-252494
Rule IDs
  • SV-252494r816477_rule
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-55950r816294_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 &gt;&gt; Security &amp; Privacy &gt;&gt; Privacy &gt;&gt; Analytics &amp; Improvement. If the box that says, "Send diagnostic &amp; usage data to Apple" is checked, this is a finding. If the box that says, "Improve Siri &amp; Dictation" is checked, this is a finding. If the box that says, "Share with App Developers" is checked, this is a finding.

Fix: F-55900r816476_fix

This setting is enforced using the "Restrictions Policy" configuration profile. The setting "Send diagnostic & usage data to Apple" can also be configured in System Preferences >> Security & Privacy >> Privacy >> Analytics & Improvement. Uncheck the box that says, "Share Mac Analytics". Uncheck the box that says, "Improve Siri & Dictation". Uncheck the box that says, "Share with App Developers".

b
The macOS system must be configured to disable Remote Apple Events.
CM-7 - Medium - CCI-000382 - V-252495 - SV-252495r816299_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000382
Version
APPL-12-002022
Vuln IDs
  • V-252495
Rule IDs
  • SV-252495r816299_rule
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-55951r816297_chk

To check if Remote Apple Events is disabled, use the following command: /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" =&gt; true

Fix: F-55901r816298_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.

c
The macOS system must be configured to disable the system preference pane for Apple ID.
CM-7 - High - CCI-001774 - V-252496 - SV-252496r853287_rule
RMF Control
CM-7
Severity
High
CCI
CCI-001774
Version
APPL-12-002031
Vuln IDs
  • V-252496
Rule IDs
  • SV-252496r853287_rule
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 Apple ID System Preference Pane must be disabled.
Checks: C-55952r816300_chk

To check if the system is configured to disable access to the Apple ID preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 'DisabledPreferencePanes' If the return is not an array, DisabledPreferencePanes, containing: "com.apple.preferences.AppleIDPrefPane", this is a finding.

Fix: F-55902r816301_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-252497 - SV-252497r853288_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001774
Version
APPL-12-002032
Vuln IDs
  • V-252497
Rule IDs
  • SV-252497r853288_rule
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-000370-GPOS-00155, SRG-OS-000095-GPOS-00049
Checks: C-55953r816303_chk

To check if the system is configured to disable access to the Internet Accounts preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 -E 'DisabledPreferencePanes|HiddenPreferencePanes' If the return is not two arrays (HiddenPreferencePanes and DisabledPreferencePanes) each containing: "com.apple.preferences.internetaccounts", this is a finding.

Fix: F-55903r816304_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-252498 - SV-252498r816308_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002035
Vuln IDs
  • V-252498
Rule IDs
  • SV-252498r816308_rule
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-55954r816306_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-55904r816307_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-252499 - SV-252499r816311_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002036
Vuln IDs
  • V-252499
Rule IDs
  • SV-252499r816311_rule
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-55955r816309_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-55905r816310_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-252500 - SV-252500r816314_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002037
Vuln IDs
  • V-252500
Rule IDs
  • SV-252500r816314_rule
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-55956r816312_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-55906r816313_fix

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

c
The macOS system must be configured to disable the tftp service.
IA-5 - High - CCI-000197 - V-252501 - SV-252501r877396_rule
RMF Control
IA-5
Severity
High
CCI
CCI-000197
Version
APPL-12-002038
Vuln IDs
  • V-252501
Rule IDs
  • SV-252501r877396_rule
The "tftp" 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. Additionally, the "tftp" service uses UDP, which is not secure.
Checks: C-55957r816315_chk

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

Fix: F-55907r816316_fix

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

b
The macOS system must be configured to disable the Siri Setup services.
CM-7 - Medium - CCI-000381 - V-252502 - SV-252502r853289_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002039
Vuln IDs
  • V-252502
Rule IDs
  • SV-252502r853289_rule
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-55958r816318_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-55908r816319_fix

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

b
The macOS system must disable iCloud Keychain synchronization.
CM-7 - Medium - CCI-001774 - V-252503 - SV-252503r853290_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001774
Version
APPL-12-002040
Vuln IDs
  • V-252503
Rule IDs
  • SV-252503r853290_rule
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-55959r816321_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-55909r816322_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-252504 - SV-252504r853291_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002041
Vuln IDs
  • V-252504
Rule IDs
  • SV-252504r853291_rule
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-55960r816324_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-55910r816325_fix

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

b
The macOS system must disable iCloud bookmark synchronization.
CM-7 - Medium - CCI-001774 - V-252505 - SV-252505r853292_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001774
Version
APPL-12-002042
Vuln IDs
  • V-252505
Rule IDs
  • SV-252505r853292_rule
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-55961r816327_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-55911r816328_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-252506 - SV-252506r853293_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002043
Vuln IDs
  • V-252506
Rule IDs
  • SV-252506r853293_rule
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-55962r816330_chk

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-55912r816331_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-252507 - SV-252507r816335_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-002050
Vuln IDs
  • V-252507
Rule IDs
  • SV-252507r816335_rule
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-55963r816333_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" =&gt; true

Fix: F-55913r816334_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 be configured to disable the system preference pane for TouchID.
CM-7 - Medium - CCI-001774 - V-252508 - SV-252508r853294_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001774
Version
APPL-12-002051
Vuln IDs
  • V-252508
Rule IDs
  • SV-252508r853294_rule
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 TouchID System Preference Pane must be disabled. Satisfies: SRG-OS-000370-GPOS-00155, SRG-OS-000095-GPOS-00049
Checks: C-55964r816336_chk

To check if the system is configured to disable access to the TouchID preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 -E 'DisabledPreferencePanes|HiddenPreferencePanes' If the return is not two arrays (HiddenPreferencePanes and DisabledPreferencePanes) each containing: "com.apple.preferences.password", this is a finding.

Fix: F-55914r816337_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 Wallet and ApplePay.
CM-7 - Medium - CCI-001774 - V-252509 - SV-252509r853295_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001774
Version
APPL-12-002052
Vuln IDs
  • V-252509
Rule IDs
  • SV-252509r853295_rule
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 Wallet & ApplePay Preference Pane must be disabled. Satisfies: SRG-OS-000370-GPOS-00155, SRG-OS-000095-GPOS-00049
Checks: C-55965r816339_chk

To check if the system is configured to disable access to the Wallet &amp; ApplePay preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 -E 'DisabledPreferencePanes|HiddenPreferencePanes' If the return is not two arrays (HiddenPreferencePanes and DisabledPreferencePanes) each containing: "com.apple.preferences.wallet", this is a finding.

Fix: F-55915r816340_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 Siri.
CM-7 - Medium - CCI-000381 - V-252510 - SV-252510r853296_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-002053
Vuln IDs
  • V-252510
Rule IDs
  • SV-252510r853296_rule
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 Preference Pane must be disabled. Satisfies: SRG-OS-000370-GPOS-00155, SRG-OS-000095-GPOS-00049
Checks: C-55966r816342_chk

To check if the system is configured to disable access to the Siri preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 -E 'DisabledPreferencePanes|HiddenPreferencePanes' If the return is not two arrays (HiddenPreferencePanes and DisabledPreferencePanes) each containing: "com.apple.preference.speech", this is a finding.

Fix: F-55916r816343_fix

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

b
The macOS system must allow only applications that have a valid digital signature to run.
CM-6 - Medium - CCI-000366 - V-252511 - SV-252511r816347_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-002060
Vuln IDs
  • V-252511
Rule IDs
  • SV-252511r816347_rule
Gatekeeper settings must be configured correctly to only allow the system to run 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-55967r816345_chk

Identify any unsigned applications that have been installed on the system: /usr/sbin/system_profiler SPApplicationsDataType | /usr/bin/grep -B 3 -A 4 -e "Obtained from: Unknown" | /usr/bin/grep -v -e "Location: /Library/Application Support/Script Editor/Templates" -e "Location: /System/Library/" | /usr/bin/awk -F "Location: " '{print $2}' | /usr/bin/sort -u If any results are returned and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify only applications with a valid digital signature are allowed to run: /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-55917r816346_fix

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

c
The macOS system must enforce access restrictions.
CM-5 - High - CCI-001813 - V-252513 - SV-252513r853297_rule
RMF Control
CM-5
Severity
High
CCI
CCI-001813
Version
APPL-12-002063
Vuln IDs
  • V-252513
Rule IDs
  • SV-252513r853297_rule
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-55969r816351_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-55919r816352_fix

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

c
The macOS system must have the security assessment policy subsystem enabled.
CM-5 - High - CCI-001749 - V-252514 - SV-252514r877463_rule
RMF Control
CM-5
Severity
High
CCI
CCI-001749
Version
APPL-12-002064
Vuln IDs
  • V-252514
Rule IDs
  • SV-252514r877463_rule
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-55970r816354_chk

To check the status of the Security assessment policy subsystem, run the following command: /usr/sbin/spctl --status 2&gt; /dev/null | /usr/bin/grep enabled If "assessments enabled" is not returned, this is a finding.

Fix: F-55920r816355_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 not allow an unattended or automatic logon to the system.
CM-6 - Medium - CCI-000366 - V-252515 - SV-252515r877377_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-002066
Vuln IDs
  • V-252515
Rule IDs
  • SV-252515r877377_rule
Failure to restrict system access to authenticated users negatively impacts operating system security.
Checks: C-55971r816357_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-55921r816358_fix

This setting is enforced using the "Login Window 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 user's files.
CM-6 - Medium - CCI-000366 - V-252516 - SV-252516r916421_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-002068
Vuln IDs
  • V-252516
Rule IDs
  • SV-252516r916421_rule
Configuring the operating system to use the most restrictive permissions possible for user home directories helps to protect against inadvertent disclosures. Satisfies: SRG-OS-000480-GPOS-00228, SRG-OS-000480-GPOS-00230
Checks: C-55972r916419_chk

Verify the macOS system is configured so that permissions are set correctly on user home directories with the following commands: /bin/ls -le /Users This command will return a listing of the permissions of the root of every user account configured on the system. For each of the users, the permissions must 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 must be: 0: group:everyone deny delete For every authorized user account, also run the following command: /usr/bin/sudo /bin/ls -le /Users/userid, where userid is an existing user. This command will return the permissions of all the objects under the users' home directory. The permissions for each of the subdirectories must be: drwx------+ 0: group:everyone deny delete The exception is the "Public" directory, whose permissions must 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-55922r916420_fix

Configure the macOS system to set the appropriate permissions for each user on the system with the following command: /usr/sbin/diskutil resetUserPermissions / DeviceNode UID, where "DeviceNode UID" is the ID number for the user whose home directory permissions need to be repaired.

c
The macOS system must use an approved antivirus program.
CM-6 - High - CCI-000366 - V-252518 - SV-252518r816481_rule
RMF Control
CM-6
Severity
High
CCI
CCI-000366
Version
APPL-12-002070
Vuln IDs
  • V-252518
Rule IDs
  • SV-252518r816481_rule
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-55974r816366_chk

Verify the "MRT" service is running by using the following command: /bin/launchctl print-disabled system | grep mrt If the results show "com.apple.mrt" =&gt; false", the MRT Service is running. If the MRT service is running, verify that it is configured to update automatically by using the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep ConfigDataInstall If, "ConfigDataInstall = 1" is not returned, this is a finding. If the MRT service is not running, 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-55924r816480_fix

Enable the MRT service: /usr/bin/sudo /bin/launchctl enable system/com.apple.mrt Installing the "Restrictions Policy" will configure the MRT Service to update automatically. If the MRT Service is not being used, 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-252519 - SV-252519r853301_rule
RMF Control
IA-5
Severity
High
CCI
CCI-000185
Version
APPL-12-003001
Vuln IDs
  • V-252519
Rule IDs
  • SV-252519r853301_rule
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-55975r816369_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 contains unapproved certificates, this is a finding.

Fix: F-55925r816370_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 enforce password complexity by requiring that at least one numeric character be used.
IA-5 - Medium - CCI-000194 - V-252520 - SV-252520r816374_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-000194
Version
APPL-12-003007
Vuln IDs
  • V-252520
Rule IDs
  • SV-252520r816374_rule
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-55976r816372_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-55926r816373_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-252521 - SV-252521r816377_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-000199
Version
APPL-12-003008
Vuln IDs
  • V-252521
Rule IDs
  • SV-252521r816377_rule
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-55977r816375_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-55927r816376_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-252522 - SV-252522r816380_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-000200
Version
APPL-12-003009
Vuln IDs
  • V-252522
Rule IDs
  • SV-252522r816380_rule
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-55978r816378_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-55928r816379_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-252523 - SV-252523r816383_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-000205
Version
APPL-12-003010
Vuln IDs
  • V-252523
Rule IDs
  • SV-252523r816383_rule
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-55979r816381_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-55929r816382_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-252524 - SV-252524r816386_rule
RMF Control
IA-5
Severity
Medium
CCI
CCI-001619
Version
APPL-12-003011
Vuln IDs
  • V-252524
Rule IDs
  • SV-252524r816386_rule
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-55980r816384_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-55930r816385_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-252525 - SV-252525r816389_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-003012
Vuln IDs
  • V-252525
Rule IDs
  • SV-252525r816389_rule
Password hints leak information about passwords in use and can lead to loss of confidentiality.
Checks: C-55981r816387_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-55931r816388_fix

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

b
The macOS system 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-252526 - SV-252526r816483_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-003013
Vuln IDs
  • V-252526
Rule IDs
  • SV-252526r816483_rule
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-55982r816390_chk

For Apple Silicon-based systems, this is Not Applicable. For Intel-based systems, ensure that a firmware password is set, run the following command: $ sudo /usr/sbin/firmwarepasswd -check If the return is not "Password Enabled: Yes", this is a finding.

Fix: F-55932r816482_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.

c
The macOS system must use multifactor authentication for local access to privileged and non-privileged accounts.
IA-5 - High - CCI-000187 - V-252527 - SV-252527r816395_rule
RMF Control
IA-5
Severity
High
CCI
CCI-000187
Version
APPL-12-003020
Vuln IDs
  • V-252527
Rule IDs
  • SV-252527r816395_rule
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. 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-000107-GPOS-00054, SRG-OS-000108-GPOS-00055, SRG-OS-000068-GPOS-00036
Checks: C-55983r816393_chk

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 "enforceSmartCard=1", this is a finding.

Fix: F-55933r816394_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 must 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-252528 - SV-252528r816485_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-003050
Vuln IDs
  • V-252528
Rule IDs
  • SV-252528r816485_rule
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-55984r816396_chk

For systems that are not utilizing smart card authentication, this is Not Applicable. 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-55934r816484_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-252529 - SV-252529r816487_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-003051
Vuln IDs
  • V-252529
Rule IDs
  • SV-252529r816487_rule
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-55985r816399_chk

For systems that are not utilizing smart card authentication, this is Not Applicable. 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-55935r816486_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/su" with the following: # su: auth account password session auth sufficient pam_smartcard.so auth required pam_rootok.so auth required pam_group.so no_warn group=admin,wheel ruser root_only fail_safe account required pam_permit.so account required pam_opendirectory.so no_check_shell password required pam_opendirectory.so session required pam_launchd.so

b
The macOS system must be configured so that the sudo command requires smart card authentication.
CM-6 - Medium - CCI-000366 - V-252530 - SV-252530r816489_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-003052
Vuln IDs
  • V-252530
Rule IDs
  • SV-252530r816489_rule
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-55986r816402_chk

For systems that are not utilizing smart card authentication, this is Not Applicable. 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-55936r816488_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/sudo" 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-252531 - SV-252531r816491_rule
RMF Control
SI-11
Severity
Medium
CCI
CCI-001314
Version
APPL-12-004001
Vuln IDs
  • V-252531
Rule IDs
  • SV-252531r816491_rule
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-55987r816405_chk

Some system log files are controlled by "newsyslog" and "aslmanager". The following commands check for log files that exist on the system and print the path to the log with the 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&gt; /dev/null /usr/bin/sudo stat -f '%Su:%Sg:%N' $(/usr/bin/grep -e '^&gt;' /etc/asl.conf /etc/asl/* | awk '{ print $2 }') 2&gt; /dev/null Each command may return zero or more files. 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-55937r816490_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-252532 - SV-252532r816493_rule
RMF Control
SI-11
Severity
Medium
CCI
CCI-001314
Version
APPL-12-004002
Vuln IDs
  • V-252532
Rule IDs
  • SV-252532r816493_rule
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-55988r816408_chk

The following commands check for log files that exist on the system and print the path to the log with the 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&gt; /dev/null /usr/bin/sudo stat -f '%A:%N' $(/usr/bin/grep -e '^&gt;' /etc/asl.conf /etc/asl/* | awk '{ print $2 }') 2&gt; /dev/null Each command may return zero or more files. If the permissions on log files are not "640" or less permissive, this is a finding.

Fix: F-55938r816492_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.

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-252533 - SV-252533r816413_rule
RMF Control
CM-6
Severity
High
CCI
CCI-000366
Version
APPL-12-004021
Vuln IDs
  • V-252533
Rule IDs
  • SV-252533r816413_rule
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-55989r816411_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-55939r816412_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-12 - Medium - CCI-000169 - V-252534 - SV-252534r853302_rule
RMF Control
AU-12
Severity
Medium
CCI
CCI-000169
Version
APPL-12-005001
Vuln IDs
  • V-252534
Rule IDs
  • SV-252534r853302_rule
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-55990r816414_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-55940r816415_fix

To re-enable "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-252535 - SV-252535r853304_rule
RMF Control
SC-28
Severity
Medium
CCI
CCI-001199
Version
APPL-12-005020
Vuln IDs
  • V-252535
Rule IDs
  • SV-252535r853304_rule
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-55991r816417_chk

Verify that "FileVault 2" is enabled by running the following command: /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-55941r853303_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-252536 - SV-252536r877367_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-005050
Vuln IDs
  • V-252536
Rule IDs
  • SV-252536r877367_rule
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.
Checks: C-55992r877366_chk

Verify that the built-in firewall is enabled: # /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep 'EnableFirewall\|EnableStealthMode' If the return is not "EnableFirewall = 1;" and "EnableStealthMode = 1;" this is a finding. If the built-in firewall is not enabled, ask the System Administrator if another application firewall is installed and enabled. If no application firewall is installed and enabled, this is a finding.

Fix: F-55942r816421_fix

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

b
The macOS system must restrict the ability to utilize external writeable media devices.
CM-6 - Medium - CCI-000366 - V-252537 - SV-252537r877369_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
APPL-12-005051
Vuln IDs
  • V-252537
Rule IDs
  • SV-252537r877369_rule
External writeable media devices must be disabled for users. External USB devices are a potential vector for malware and can be used to exfiltrate sensitive data. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000319-GPOS-00164
Checks: C-55993r877368_chk

Verify the system is configured to disable external writeable media devices: $ /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/egrep -A 3 'blankbd|blankcd|blankdvd|dvdram|harddisk-external' “blankbd" = ( deny, eject ); “blankcd" = ( deny, eject ); “blankdvd" = ( deny, eject ); “dvdram" = ( deny, eject ); “harddisk-external" = ( deny, eject ); If the result does not match the output above and the external writeable media devices have not been approved by the Authorizing Official, this is a finding.

Fix: F-55943r816424_fix

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

a
The macOS system logon window must be configured to prompt for username and password, rather than show a list of users.
CM-6 - Low - CCI-000366 - V-252538 - SV-252538r877377_rule
RMF Control
CM-6
Severity
Low
CCI
CCI-000366
Version
APPL-12-005052
Vuln IDs
  • V-252538
Rule IDs
  • SV-252538r877377_rule
The logon window must be configured to prompt all users for both a username and a password. By default, the system displays a list of known users at the logon screen. This gives an advantage to an attacker with physical access to the system, as the attacker would only have to guess the password for one of the listed accounts.
Checks: C-55994r816426_chk

To check if the logon window is configured to prompt for user name and password, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SHOWFULLNAME If there is no result, or "SHOWFULLNAME" is not set to "1", this is a finding.

Fix: F-55944r816427_fix

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

a
The macOS system must restrict the ability of individuals to write to external optical media.
CM-6 - Low - CCI-000366 - V-252539 - SV-252539r816431_rule
RMF Control
CM-6
Severity
Low
CCI
CCI-000366
Version
APPL-12-005053
Vuln IDs
  • V-252539
Rule IDs
  • SV-252539r816431_rule
External writeable media devices must be disabled for users. External optical media devices can be used to exfiltrate sensitive data if an approved data-loss prevention (DLP) solution is not installed.
Checks: C-55995r816429_chk

Verify the system is configured to disable writing to external optical media devices: $ /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep 'BurnSupport' BurnSupport = off; If the command does not return a line, this is a finding. If 'BurnSupport' is set to a value other than 'off' and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix: F-55945r816430_fix

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

b
The macOS system must be configured to disable prompts to configure Touch ID.
CM-7 - Medium - CCI-000381 - V-252540 - SV-252540r816434_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-005054
Vuln IDs
  • V-252540
Rule IDs
  • SV-252540r816434_rule
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-55996r816432_chk

To check if TouchID setup prompts are disabled, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SkipTouchIDSetup If the return is not "SkipTouchIDSetup = 1", this is a finding.

Fix: F-55946r816433_fix

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

a
The macOS system must be configured to disable prompts to configure ScreenTime.
CM-7 - Low - CCI-000381 - V-252541 - SV-252541r816983_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-005055
Vuln IDs
  • V-252541
Rule IDs
  • SV-252541r816983_rule
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-55997r816435_chk

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

Fix: F-55947r816436_fix

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

b
The macOS system must be configured to disable promts to configure Unlock with Watch.
CM-7 - Medium - CCI-000381 - V-252542 - SV-252542r832917_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-005056
Vuln IDs
  • V-252542
Rule IDs
  • SV-252542r832917_rule
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-55998r832916_chk

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

Fix: F-55948r816439_fix

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

a
The macOS system must be configured to prevent activity continuation between Apple Devices.
CM-7 - Low - CCI-000381 - V-252543 - SV-252543r816443_rule
RMF Control
CM-7
Severity
Low
CCI
CCI-000381
Version
APPL-12-005058
Vuln IDs
  • V-252543
Rule IDs
  • SV-252543r816443_rule
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-55999r816441_chk

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

Fix: F-55949r816442_fix

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

b
The macOS system must be configured to prevent password proximity sharing requests from nearby Apple Devices.
CM-7 - Medium - CCI-000381 - V-252544 - SV-252544r816446_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-005060
Vuln IDs
  • V-252544
Rule IDs
  • SV-252544r816446_rule
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-56000r816444_chk

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

Fix: F-55950r816445_fix

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

b
The macOS system must be configured to prevent users from erasing all system content and settings.
CM-7 - Medium - CCI-000381 - V-252545 - SV-252545r816449_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
APPL-12-005061
Vuln IDs
  • V-252545
Rule IDs
  • SV-252545r816449_rule
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-56001r816447_chk

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

Fix: F-55951r816448_fix

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

a
The macOS system must be configured with Bluetooth turned off unless approved by the organization.
IA-3 - Low - CCI-001967 - V-252699 - SV-252699r916433_rule
RMF Control
IA-3
Severity
Low
CCI
CCI-001967
Version
APPL-12-002062
Vuln IDs
  • V-252699
Rule IDs
  • SV-252699r916433_rule
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. Satisfies: SRG-OS-000481-GPOS-000481, SRG-OS-000319-GPOS-00164
Checks: C-56155r819040_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. To check if the system is configured to disable access to the Bluetooth preference pane and prevent it from being displayed, run the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep -A 6 -E 'DisabledPreferencePanes|HiddenPreferencePanes' If the return is not two arrays (HiddenPreferencePanes and DisabledPreferencePanes) each containing: “com.apple.preferences.Bluetooth”, this is a finding.

Fix: F-56105r819041_fix

This setting is enforced using the "Custom Policy" and "Restrictions Policy" configuration profiles.

b
The macOS system must prevent nonprivileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.
AC-6 - Medium - CCI-002235 - V-257772 - SV-257772r922850_rule
RMF Control
AC-6
Severity
Medium
CCI
CCI-002235
Version
APPL-12-002069
Vuln IDs
  • V-257772
Rule IDs
  • SV-257772r922850_rule
Preventing nonprivileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Nonprivileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from nonprivileged users.
Checks: C-61513r922848_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. &lt;key&gt;shared&lt;/key&gt; &lt;false/&gt;

Fix: F-61437r922849_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 implement approved ciphers within the SSH client configuration to protect the confidentiality of SSH connections.
AC-17 - High - CCI-000068 - V-257773 - SV-257773r922864_rule
RMF Control
AC-17
Severity
High
CCI
CCI-000068
Version
APPL-12-000057
Vuln IDs
  • V-257773
Rule IDs
  • SV-257773r922864_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174
Checks: C-61514r922862_chk

Verify the macOS system is configured to use approved SSH ciphers within the SSH client configuration with the following command: /usr/bin/sudo /usr/bin/grep -ir "ciphers" /etc/ssh/ssh_config* /etc/ssh/ssh_config.d/fips_ssh_config:Ciphers aes128-gcm@openssh.com If any ciphers other than "aes128-gcm@openssh.com" are listed, or the "ciphers" keyword is missing, this is a finding.

Fix: F-61438r922863_fix

Configure the macOS system to use approved SSH ciphers by creating a plain text file in the /private/etc/ssh/ssh_config.d/ directory containing the following: Ciphers aes128-gcm@openssh.com The SSH service must be restarted for changes to take effect.

c
The macOS system must implement approved Message Authentication Codes (MACs) within the SSH client configuration.
AC-17 - High - CCI-000068 - V-257774 - SV-257774r922867_rule
RMF Control
AC-17
Severity
High
CCI
CCI-000068
Version
APPL-12-000058
Vuln IDs
  • V-257774
Rule IDs
  • SV-257774r922867_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00175
Checks: C-61515r922865_chk

Verify the macOS system is configured to use approved SSH MACs within the SSH client configuration with the following command: /usr/bin/sudo /usr/bin/grep -ir "macs" /etc/ssh/ssh_config* /etc/ssh/ssh_config.d/fips_ssh_config:Macs hmac-sha2-256 If any hashes other than "hmac-sha2-256" are listed, or the "macs" keyword is missing, this is a finding.

Fix: F-61439r922866_fix

Configure the macOS system to use approved SSH MACs by creating a plain text file in the /private/etc/ssh/ssh_config.d/ directory containing the following: MACs hmac-sha2-256 The SSH service must be restarted for changes to take effect.

c
The macOS system must implement approved Key Exchange Algorithms within the SSH client configuration.
AC-17 - High - CCI-000068 - V-257775 - SV-257775r922870_rule
RMF Control
AC-17
Severity
High
CCI
CCI-000068
Version
APPL-12-000059
Vuln IDs
  • V-257775
Rule IDs
  • SV-257775r922870_rule
Operating systems using encryption are required to use FIPS-compliant mechanisms for authenticating to macOS. For OpenSSH to utilize the Apple Corecrypto FIPS-validated algorithms, a specific configuration is required to leverage the shim implemented by macOS to bypass the non-FIPS validated LibreSSL crypto module packaged with OpenSSH. Information regarding this configuration can be found in the manual page "apple_ssh_and_fips". Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00176
Checks: C-61516r922868_chk

Verify the macOS system is configured to use approved SSH Key Exchange Algorithms within the SSH client configuration with the following command: /usr/bin/sudo /usr/bin/grep -ir "kexalgorithms" /etc/ssh/ssh_config* /etc/ssh/ssh_config.d/fips_ssh_config:KexAlgorithms ecdh-sha2-nistp256 If any algorithms other than "ecdh-sha2-nistp256" are listed, or the "kexalgorithms" keyword is missing, this is a finding.

Fix: F-61440r922869_fix

Configure the macOS system to use approved SSH Key Exchange Algorithms by creating a plain text file in the /private/etc/ssh/ssh_config.d/ directory containing the following: KexAlgorithms ecdh-sha2-nistp256 The SSH service must be restarted for changes to take effect.