Title

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

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

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.

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

Additional Identifiers

Rule ID: SV-257156r905101_rule

Vulnerability ID: V-257156

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.