From F5 BIG-IP Local Traffic Manager 11.x Security Technical Implementation Guide
Part of SRG-NET-000308-ALG-000008
Associated with: CCI-002364
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.
If the BIG-IP Core does not provide user access control intermediary services for virtual servers, this is not applicable. When user access control intermediary services are provided, verify the BIG-IP Core is configured as follows: Verify Virtual Server(s) in the BIG-IP LTM module are configured with an APM policy to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions when providing access to virtual servers. Navigate to the BIG-IP System manager >> Local Traffic >> Virtual Servers >> Virtual Servers List tab. Select Virtual Servers(s) from the list to verify. Verify under "Access Policy" section, that "Access Policy" has been set to use an APM access policy that displays an explicit logoff message to users indicating the reliable termination of authenticated communications sessions. If the BIG-IP Core is not configured to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions, this is a finding.
If user access control intermediary services are provided, configure the BIG-IP Core as follows: Configure a policy in the BIG-IP APM module to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions. Apply APM policy to the applicable Virtual Server(s) in the BIG-IP LTM module to display an explicit logoff message to users indicating the reliable termination of authenticated communications sessions when providing access to virtual servers.
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