CCI-000048 in U Apple macOS 13 V1R4

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UNCLASSIFIED

Group Title

SRG-OS-000023-GPOS-00006

Group ID

V-257155

Rule Version

APPL-13-000023

Rule Title

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

Rule ID

SV-257155r905098_rule

Rule Severity

● Medium

Rule Weight

10.0

Vuln Discussion

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.

Documentable

False

Check Content

If SSH is not being used, this is not applicable.

Verify the macOS system is configured to display the Standard Mandatory DOD Notice and Consent Banner before granting remote 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:

/usr/bin/more /etc/banner

The command must 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 logon banner before granting remote access 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.

Check System

C-60840r905096_chk

Fix Reference

F-60781r905097_fix

Fix Text

Configure the macOS system to display the Standard Mandatory DOD Notice and Consent Banner before granting remote access to the operating system by creating a text file containing the required DOD text.

Name the file "banner" and place it in "/etc/".

Identities

CCI-000048

Display an organization-defined system use notification message or banner to users before granting access to the system that provides privacy and security notices consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidelines.

800-53 :: AC-8 a
800-53 Rev. 4 :: AC-8 a
800-53 Rev. 5 :: AC-8 a
800-53A :: AC-8.1 (ii)

Group Title

SRG-OS-000023-GPOS-00006

Group ID

V-257156

Rule Version

APPL-13-000024

Rule Title

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

Rule ID

SV-257156r905101_rule

Rule Severity

● Medium

Rule Weight

10.0

Vuln Discussion

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

Documentable

False

Check Content

If SSH is not being used, this is not applicable.

Verify the macOS system is configured to display the contents of "/etc/banner" before granting access to the system with the following command:

/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.

Check System

C-60841r905099_chk

Fix Reference

F-60782r905100_fix

Fix Text

Configure the macOS system to display the contents of "/etc/banner" before granting access to the system with the following command:

/usr/bin/sudo /usr/bin/sed -i.bak 's/^#Banner.*/Banner \/etc\/banner/' /etc/ssh/sshd_config

Identities

CCI-000048

800-53 :: AC-8 a
800-53 Rev. 4 :: AC-8 a
800-53 Rev. 5 :: AC-8 a
800-53A :: AC-8.1 (ii)

CCI-000050

Retain the notification message or banner on the screen until users acknowledge the usage conditions and take explicit actions to log on to or further access the system.

800-53 :: AC-8 b
800-53 Rev. 4 :: AC-8 b
800-53 Rev. 5 :: AC-8 b
800-53A :: AC-8.1 (iii)

Group Title

SRG-OS-000023-GPOS-00006

Group ID

V-257157

Rule Version

APPL-13-000025

Rule Title

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.

Rule ID

SV-257157r905104_rule

Rule Severity

● Medium

Rule Weight

10.0

Vuln Discussion

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

Documentable

False

Check Content

Verify the macOS system is configured to display a policy banner with the following command:

/bin/ls -l /Library/Security/PolicyBanner.rtfd

-rw-r--r--@ 1 admin sheel 37 Jan 27 11:18 /Library/Security/PolicyBanner.rtfd

If "PolicyBanner.rtfd" does not exist, this is a finding.

If the permissions for "PolicyBanner.rtfd" are not "644", 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:

-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.

If the text is not worded exactly this way, this is a finding.

Check System

C-60842r905102_chk

Fix Reference

F-60783r905103_fix

Fix Text

Configure the macOS system to display a policy banner by creating an RTF file containing the required text. Name the file "PolicyBanner.rtfd" and place it in "/Library/Security/".

Update the permissions of the "/Library/Security/PolicyBanner.rtfd" file with the following command:

/usr/bin/sudo /bin/chmod 644 /Library/Security/PolicyBanner.rtfd

Identities

CCI-000048

800-53 :: AC-8 a
800-53 Rev. 4 :: AC-8 a
800-53 Rev. 5 :: AC-8 a
800-53A :: AC-8.1 (ii)

CCI-000050

Retain the notification message or banner on the screen until users acknowledge the usage conditions and take explicit actions to log on to or further access the system.

800-53 :: AC-8 b
800-53 Rev. 4 :: AC-8 b
800-53 Rev. 5 :: AC-8 b
800-53A :: AC-8.1 (iii)

CCI-001384

For publicly accessible systems, display system use information with organization-defined conditions before granting further access to the publicly accessible system.

800-53 :: AC-8 c
800-53 Rev. 4 :: AC-8 c 1
800-53 Rev. 5 :: AC-8 c 1
800-53A :: AC-8.2 (i)

CCI-001385

For publicly accessible systems, displays references, if any, to monitoring that are consistent with privacy accommodations for such systems that generally prohibit those activities.

800-53 :: AC-8 c
800-53 Rev. 4 :: AC-8 c 2
800-53 Rev. 5 :: AC-8 c 2
800-53A :: AC-8.2 (ii)

CCI-001386

For publicly accessible systems, displays references, if any, to recording that are consistent with privacy accommodations for such systems that generally prohibit those activities.

800-53 :: AC-8 c
800-53 Rev. 4 :: AC-8 c 2
800-53 Rev. 5 :: AC-8 c 2
800-53A :: AC-8.2 (ii)

CCI-001387

For publicly accessible systems, displays references, if any, to auditing that are consistent with privacy accommodations for such systems that generally prohibit those activities.

800-53 :: AC-8 c
800-53 Rev. 4 :: AC-8 c 2
800-53 Rev. 5 :: AC-8 c 2
800-53A :: AC-8.2 (ii)

CCI-001388

For publicly accessible systems, includes a description of the authorized uses of the system.

800-53 :: AC-8 c
800-53 Rev. 4 :: AC-8 c 3
800-53 Rev. 5 :: AC-8 c 3
800-53A :: AC-8.2 (iii)

UNCLASSIFIED