AlmaLinux OS 9 must disable the ability of a user to accidentally press Ctrl-Alt-Del and cause a system to shut down or reboot.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-269187 | ALMA-09-012230 | SV-269187r1050069_rule | Medium |
| Description |
| A locally logged-in user who presses Ctrl-Alt-Del, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. |
| STIG | Date |
| CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide | 2025-05-22 |
Details
| Check Text (C-73218r1049282_chk) |
| Note: This requirement assumes the use of the AlmaLinux OS 9 default graphical user interface, the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is Not Applicable. Verify AlmaLinux OS 9 is configured to ignore the Ctrl-Alt-Del sequence in the GNOME desktop with the following command: $ gsettings get org.gnome.settings-daemon.plugins.media-keys logout "['']" If the GNOME desktop is configured to shut down when Ctrl-Alt-Del is pressed, this is a finding. |
| Fix Text (F-73119r1049283_fix) |
| Configure AlmaLinux OS 9 to ignore the Ctrl-Alt-Del sequence in the GNOME desktop. Add or update the [org/gnome/settings-daemon/plugins/media-keys] section of the /etc/dconf/db/local.d/00-security-settings database file and add or update the following lines: [org/gnome/settings-daemon/plugins/media-keys] logout=[''] Run the following command to update the database: $ dconf update |