OL 8 must prevent users from disabling session control mechanisms.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-248677	OL08-00-020042	SV-248677r779597_rule		Low

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. Rather than be forced to wait for a period of time to expire before the user session can be locked, OL 8 needs to provide users with the ability to manually invoke a session lock so users can secure their session if it is necessary to temporarily vacate the immediate physical vicinity. Tmux is a terminal multiplexer that enables a number of terminals to be created, accessed, and controlled from a single screen. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011

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. Rather than be forced to wait for a period of time to expire before the user session can be locked, OL 8 needs to provide users with the ability to manually invoke a session lock so users can secure their session if it is necessary to temporarily vacate the immediate physical vicinity. Tmux is a terminal multiplexer that enables a number of terminals to be created, accessed, and controlled from a single screen. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011

STIG	Date
Oracle Linux 8 Security Technical Implementation Guide	2023-03-06

Details

Check Text ( C-52111r779595_chk )
Verify the operating system prevents users from disabling the tmux terminal multiplexer with the following command: $ sudo grep -i tmux /etc/shells If any output is produced, this is a finding.

Fix Text (F-52065r779596_fix)
Configure the operating system to prevent users from disabling the tmux terminal multiplexer by editing the "/etc/shells" configuration file to remove any instances of tmux.