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Check: RHEL-08-020035

RHEL 8 STIG: RHEL-08-020035 (in versions v1 r14 through v1 r11)

Title

RHEL 8 must terminate idle user sessions. (Cat II impact)

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.

Check Content

Verify that RHEL 8 logs out sessions that are idle for 15 minutes with the following command: $ sudo grep -i ^StopIdleSessionSec /etc/systemd/logind.conf StopIdleSessionSec=900 If "StopIdleSessionSec" is not configured to "900" seconds, this is a finding.

Fix Text

Configure RHEL 8 to log out idle sessions by editing the /etc/systemd/logind.conf file with the following line: StopIdleSessionSec=900 The "logind" service must be restarted for the changes to take effect. To restart the "logind" service, run the following command: $ sudo systemctl restart systemd-logind Note: To preserve running user programs such as tmux, uncomment and/or edit "KillUserProccesses=no" in "/etc/systemd/logind.conf".

Additional Identifiers

Rule ID: SV-257258r942953_rule

Vulnerability ID: V-257258

Group Title: SRG-OS-000163-GPOS-00072

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001133	The information system terminates the network connection associated with a communications session at the end of the session or after an organization-defined time period of inactivity.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
SC-10	Network Disconnect