IBM z/OS must employ a session manager to manage session lock after a 15-minute period of inactivity.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-223576	SRG-OS-000029-GPOS-00010	ACF2-OS-002360	SV-223576r958402_rule	2025-03-11	9

Description
A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Regardless of where the session lock is determined and implemented, once invoked, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.

Description

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Regardless of where the session lock is determined and implemented, once invoked, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.

ℹ️ Check
Ask the system administrator for the configuration parameters for the session manager in use. If there is no session manager in use, this is a finding. If the session manager is not configured to initiate session lock after a 15-minute period of inactivity this is a finding.

✔️ Fix
Configure the session manager to initiate a session lock after a 15-minute period of inactivity.