Ubuntu 24.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence if a graphical user interface is installed.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-270711 | UBTU-24-300025 | SV-270711r1101772_rule | High |
| Description |
| A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken. |
| STIG | Date |
| Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide | 2025-05-16 |
Details
| Check Text (C-74744r1101770_chk) |
| Verify Ubuntu 24.04 LTS is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using a graphical user interface with the following command: $ gsettings get org.gnome.settings-daemon.plugins.media-keys logout [''] If the "logout" key is bound to an action, is commented out, or is missing, this is a finding. |
| Fix Text (F-74645r1101771_fix) |
| Configure the system to disable the Ctrl-Alt-Delete sequence when using a graphical user interface. Create or edit a file named /etc/dconf/db/local.d/00-screensaver with the following contents: [org/gnome/settings-daemon/plugins/media-keys] logout=[''] Update the dconf settings: $ sudo dconf update |