AlmaLinux OS 9 must automatically exit interactive command shell user sessions after 10 minutes of inactivity.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269108 | ALMA-09-001890 | SV-269108r1049990_rule | CCI-000057 | 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. Declaring $TMOUT as read-only means the user cannot override the setting. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000281-GPOS-00111, SRG-OS-000163-GPOS-00072 | ||||
| STIG | Date | |||
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 | |||
Details
Check Text (C-269108r1049990_chk)
Verify AlmaLinux OS 9 is configured to exit interactive command shell user sessions after 10 minutes of inactivity or less with the following command:
$ grep TMOUT /etc/profile /etc/profile.d/*.sh
/etc/profile.d/tmout.sh:declare -xr TMOUT=600
If "TMOUT" is not set to "600" 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-73040r1049103_fix)
Configure AlmaLinux OS 9 to exit interactive command shell user sessions after 10 minutes of inactivity using the following command:
echo "declare -xr TMOUT=600" > /etc/profile.d/tmout.sh