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RHEL 9 must automatically exit interactive command shell user sessions after 15 minutes of inactivity.


Overview

Finding ID Version Rule ID IA Controls Severity
V-258068 RHEL-09-412035 SV-258068r970703_rule Medium
Description
Terminating an idle interactive command shell user session within a short time period reduces the window of opportunity for unauthorized personnel to take control of it when left unattended in a virtual terminal or physical console. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000029-GPOS-00010
STIG Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide 2024-06-04

Details

Check Text ( C-61809r926189_chk )
Verify RHEL 9 is configured to exit interactive command shell user sessions after 15 minutes of inactivity or less with the following command:

$ sudo grep -i tmout /etc/profile /etc/profile.d/*.sh

/etc/profile.d/tmout.sh:declare -xr TMOUT=900

If "TMOUT" is not set to "900" or less in a script located in the "/etc/'profile.d/ directory, is missing or is commented out, this is a finding.
Fix Text (F-61733r926190_fix)
Configure RHEL 9 to exit interactive command shell user sessions after 15 minutes of inactivity.

Add or edit the following line in "/etc/profile.d/tmout.sh":

#!/bin/bash

declare -xr TMOUT=900