Title

The warning banner for the z/OS UNIX Telnet Server must be properly specified (Cat II impact)

Discussion

A logon banner can be used to inform users about the environment during the initial logon. Logon banners are used to warn users against unauthorized entry and the possibility of legal action for unauthorized users, and advise all users that system use constitutes consent to monitoring. Failure to display a logon warning banner without this type of information could adversely impact the ability to prosecute unauthorized users and users who abuse the system.

Check Content

a) Refer to the following report produced by the UNIX System Services Data Collection: - USSCMDS.RPT(IUTN0030) Automated Analysis requires Additional Analysis. Refer to the following report produced by the IBM Communications Server Data Collection: - PDI(IUTN0030) - PDIx(IUTN0030) Note: Created when sites have multiple TCP/IP and FTP started task procedures. NOTE: Additional Analysis will be required for the above file. b) Ensure the /etc/banner file contains a logon banner. The below banner is mandatory and deviations are not permitted except as authorized in writing by the DoD Chief Information Officer. The thrust of this new policy is to make it clear that there is no expectation of privacy when using DoD information systems and all use of DoD information systems is subject to searching, auditing, inspecting, seizing, and monitoring, even if some personal use of a system is permitted: STANDARD MANDATORY DOD NOTICE AND CONSENT BANNER 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. c) If all the items in (b) above are true, there is NO FINDING. d) If any item in (b) above is untrue, this is a FINDING.

Fix Text

Review the /etc/banner file and ensure the text specifies a logon banner in accordance with DISA requirements. DOD requires that a logon warning banner be displayed. Although the z/OS UNIX Telnet Server does not support the display of a message before the logon prompt, it is possible to display a message immediately after logon.

Additional Identifiers

Rule ID: SV-3231r3_rule

Vulnerability ID: V-3231

Group Title: IUTN0030

Expert Comments

CCIs tied to check.

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