Details

If a user cannot explicitly end a session, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Users need to be aware of whether or not the session has been terminated.

Logoff messages for access, for example, can be displayed after authenticated sessions have been terminated. However, for some types of interactive sessions, including, for example, remote logon, information systems typically send logoff messages as final messages prior to terminating sessions.

This policy only applies to ALGs (e.g., identity management or authentication gateways) that provide user account services as part of the intermediary services.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

If user access control intermediary services are provided, configure the BIG-IP APM module to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_F5_BIG-IP_11-x_Y20M10_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Access Control, Configuration Management.This control applies to the following type of system F5.

References

• 800-53|AC-12(1)
• 800-53|CM-6b.
• CAT|II
• CCI|CCI-000366
• CCI|CCI-002364
• Rule-ID|SV-230212r561153_rule
• STIG-ID|F5BI-AP-000151
• STIG-Legacy|SV-74471
• STIG-Legacy|V-60041
• Vuln-ID|V-230212

Source

• Tenable.com/audits