Ubuntu OS must automatically exit interactive command shell user sessions after five minutes of inactivity.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-275643 | SRG-OS-000279-GPOS-00109 | RIIM-OS-412030 | SV-275643r1147979_rule | 2025-10-02 | 1 |
| 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. |
| ℹ️ Check |
|---|
| Verify Ubuntu OS is configured to automatically exit interactive command shell user sessions after five minutes of inactivity or less by using the following command: $ sudo grep -E "\bTMOUT=[0-9]+" /etc/bash.bashrc /etc/profile.d/* /etc/profile.d/99-terminal_tmout.sh:TMOUT=300 If "TMOUT" is not set to "300" or less, is set to "0", is commented out, or missing, this is a finding. |
| ✔️ Fix |
|---|
| Configure Ubuntu OS to exit interactive command shell user sessions after five minutes of inactivity. Create and/or append a custom file under "/etc/profile.d/" by using the following command: $ sudo su -c "echo TMOUT=300 >> /etc/profile.d/99-terminal_tmout.sh" This will set a timeout value of five minutes for all future sessions. To set the timeout for the current sessions, execute the following command over the terminal session: $ export TMOUT=300 |