IBM z/OS Session manager must properly configure wait time limits.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223999	TSS0-OS-000030	SV-223999r877840_rule		Medium

Description
A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

Description

A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

STIG	Date
IBM z/OS TSS Security Technical Implementation Guide	2023-12-18

Details

Check Text ( C-25672r516396_chk )
If the session manager in use initiates a session lock after a 15-minute period of inactivity for all connection types, this is not a finding.

Fix Text (F-25660r516397_fix)
Configure the session manager in use to initiate a session lock after a 15-minute period of inactivity for all connection types.