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Check: RHEL-09-255025

RHEL 9 STIG: RHEL-09-255025 (in version v1 r2)

Title

RHEL 9 must display the Standard Mandatory DOD Notice and Consent Banner before granting local or remote access to the system via a SSH logon. (Cat II impact)

Discussion

The warning message reinforces policy awareness during the logon process and facilitates possible legal action against attackers. Alternatively, systems whose ownership should not be obvious should ensure usage of a banner that does not provide easy attribution. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088

Check Content

Verify any SSH connection to the operating system displays the Standard Mandatory DOD Notice and Consent Banner before granting access to the system. Check for the location of the banner file being used with the following command: $ sudo grep -ir banner /etc/ssh/sshd_config /etc/ssh/sshd_config.d/* banner /etc/issue This command will return the banner keyword and the name of the file that contains the SSH banner (in this case "/etc/issue"). If the line is commented out, this is a finding.

Fix Text

Configure RHEL 9 to display the Standard Mandatory DOD Notice and Consent Banner before granting access to the system via ssh. Edit the "/etc/ssh/sshd_config" file to uncomment the banner keyword and configure it to point to a file that will contain the logon banner (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor). An example configuration line is: Banner /etc/issue

Additional Identifiers

Rule ID: SV-257981r943028_rule

Vulnerability ID: V-257981

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

Expert Comments

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CCIs

CCIs tied to check.
Number Definition
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.
CCI-001384

For publicly accessible systems, display system use information with organization-defined conditions before granting further access to the publicly accessible system.
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.
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.
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.
CCI-001388

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

Controls

Controls tied to check. These are derived from the CCIs shown above.
Number Title
AC-8

System Use Notification