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RHEL 8 must enable a user session lock until that user re-establishes access using established identification and authentication procedures for command line sessions.


Finding ID Version Rule ID IA Controls Severity
V-230348 RHEL-08-020040 SV-230348r743987_rule Medium
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, RHEL 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. Red Hat endorses tmux as the recommended session controlling package. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-06-15


Check Text ( C-33017r743985_chk )
Verify the operating system enables the user to initiate a session lock with the following command:

$ sudo grep -i lock-command /etc/tmux.conf

set -g lock-command vlock

If the "lock-command" is not set in the global settings to call "vlock", this is a finding.
Fix Text (F-32992r743986_fix)
Configure the operating system to enable a user to initiate a session lock via tmux.

Create a global configuration file "/etc/tmux.conf" and add the following line:

set -g lock-command vlock