Title

The Cisco ASA remote access VPN server must be configured to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the network. (Cat II impact)

Discussion

Display of a standardized and approved use notification before granting access to the network ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. In most VPN implementations, the banner is configured in the management backplane (NDM SRG) and serves as the presentation for the VPN client connection as well as for administrator logon to the device management tool/backplane. 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. This requirement applies to VPN gateways that have the concept of a user account and have the logon function residing on the VPN gateway. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for VPN gateways that can accommodate banners of 1300 characters: "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." Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner: "I've read & consent to terms in IS user agreem't."

Check Content

Verify that the ASA is configured to display the Standard Mandatory DoD Notice and Consent Banner before granting remote access to the network as shown in the example below. group-policy GROUP_POLICY_ANYCONNECT attributes banner value I've read & consent to terms in IS user agreem't. If the ASA is not configured to display the Standard Mandatory DoD Notice and Consent Banner before granting remote access to the network, this is a finding.

Fix Text

Configure the ASA to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the network as shown in the example below. ASA3(config)# group-policy GROUP_POLICY_ANYCONNECT attributes ASA3(config-group-policy)# banner value I've read & consent to terms in IS user agreem't. ASA3(config-group-policy)# end

Additional Identifiers

Rule ID: SV-239970r666316_rule

Vulnerability ID: V-239970

Group Title: SRG-NET-000041-VPN-000110

Expert Comments

CCIs tied to check.

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