Title

The Unified Communications Endpoint must display an explicit logout message to users indicating the reliable termination of communications sessions. (Cat II impact)

Discussion

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. Logout 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 login, information systems typically send logout messages as final messages prior to terminating sessions. This applies to network elements that have the concept of a user account and have the login function residing on the network element.

Check Content

Verify the Unified Communications Endpoint displays an explicit logout message to users indicating the termination of communications sessions. If the Unified Communications Endpoint does not display an explicit logout message to users, this is a finding.

Fix Text

Configure the Unified Communications Endpoint to display an explicit logout message to users indicating the termination of communications sessions.

Additional Identifiers

Rule ID: SRG-NET-000519-VVEP-00101_rule

Vulnerability ID: SRG-NET-000519-VVEP-00101

Group Title: SRG-NET-000519-VVEP-00101

Expert Comments

CCIs tied to check.

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