IBM z/OS must employ a session manager to initiate a session lock after a 15-minute period of inactivity for all connection types.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-224033	TSS0-OS-000370	SV-224033r561402_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	2021-07-06

Details

Check Text ( C-25706r516498_chk )
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 a session lock after a 15-minute period of inactivity, this is a finding.

Fix Text (F-25694r516499_fix)
Configure the session manager to initiate a session lock after a 15-minute period of inactivity.