Title

The VPN Client logout function must be configured to terminate the session on/with the VPN Gateway. (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. 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 VPN gateways that have the concept of a user account and have the login function residing on the VPN gateway.

Check Content

Verify the VPN Client logout function is configured to terminate the session on/with the VPN Gateway. If the VPN Client logout function does not terminate the session on/with the VPN Gateway, this is a finding.

Fix Text

Configure the VPN Client logout log out function must be configured to terminate the session on/with the VPN Gateway.

Additional Identifiers

Rule ID: SV-207254r856725_rule

Vulnerability ID: V-207254

Group Title: SRG-NET-000518

Expert Comments

CCIs tied to check.

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