Vulnerability 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 banner must be formatted in accordance with DTM-08-060.

Satisfies: SRG-OS-000023-GPOS-00006,SRG-OS-000024-GPOS-00007

Check

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

Verify 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.

Fix

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/".