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UBTU-24-300026 Ubuntu 24.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence.

DISA STIG library V1R7
All changes in this version
first version loaded CAT I

Maps to CM-6 via CCI-000366

Title

Ubuntu 24.04 LTS must disable the x86 Ctrl-Alt-Delete key sequence.

Control

Verify Ubuntu 24.04 LTS is not configured to reboot the system when Ctrl-Alt-Delete is pressed with the following command: $ systemctl status ctrl-alt-del.target o ctrl-alt-del.target Loaded: masked (Reason: Unit ctrl-alt-del.target is masked.) Active: inactive (dead) If the "ctrl-alt-del.target" is not masked, this is a finding.

Discussion

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.

Related controls

CCI-000366

Fix

Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following commands: $ sudo systemctl disable ctrl-alt-del.target [...] $ sudo systemctl mask ctrl-alt-del.target Created symlink /etc/systemd/system/ctrl-alt-del.target ? /dev/null. Reload the daemon to take effect: $ sudo systemctl daemon-reload