Title

The macOS system must display the Standard Mandatory DOD Notice and Consent Banner at the login window. (Cat II impact)

Discussion

Displaying a standardized and approved use notification before granting access to the operating system ensures that users are provided with privacy and security notification verbiage that 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 policy banner will show if a "PolicyBanner.rtf" or "PolicyBanner.rtfd" exists in the "/Library/Security" folder. 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

Check Content

Verify the macOS system is configured to display a policy banner with the following command: /bin/ls -ld /Library/Security/PolicyBanner.rtf* | /usr/bin/wc -l | /usr/bin/tr -d ' ' 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: -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 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

Additional Identifiers

Rule ID: SV-259431r940915_rule

Vulnerability ID: V-259431

Group Title: SRG-OS-000023-GPOS-00006

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.