The VPN Client logout function must be configured to terminate the session on/with the VPN Gateway.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-207254
SRG-NET-000518-VPN-002280
SV-207254r856725_rule
Medium
Description
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.