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RHEL-09-412080 RHEL 9 must terminate idle user sessions.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to SC-10 via CCI-001133

Title

RHEL 9 must terminate idle user sessions.

Control

Note: For cloud-hosted systems where "ClientAliveInterval" (V-257996) is configured, this setting is not applicable. Verify RHEL 9 logs out sessions that are idle for 10 minutes with the following command: $ systemd-analyze cat-config systemd/logind.conf | grep StopIdleSessionSec #StopIdleSessionSec=infinity StopIdleSessionSec=600 If "StopIdleSessionSec" is not configured to "600" seconds, this is a finding.

Discussion

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended.

Related controls

CCI-001133

Fix

Configure RHEL 9 to log out idle sessions. Create the directory if necessary: $ mkdir -p /etc/systemd/logind.conf.d/ Create a *.conf file in /etc/systemd/logind.conf.d/ with the following content: [Login] StopIdleSessionSec=600 KillUserProcesses=no Restart systemd-logind: $ systemctl restart systemd-logind