Title

Ubuntu OS must disable the x86 Ctrl-Alt-Delete key sequence. (Cat II impact)

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.

Check Content

Verify Ubuntu OS is not configured to reboot the system when Ctrl-Alt-Delete is pressed by using the following command: $ systemctl status ctrl-alt-del.target 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.

Fix Text

Configure Ubuntu OS to disable the Ctrl-Alt-Delete sequence for the command line by using the following commands: $ sudo systemctl disable ctrl-alt-del.target $ sudo systemctl mask ctrl-alt-del.target Reload the daemon to take effect: $ sudo systemctl daemon-reload

Additional Identifiers

Rule ID: SV-275565r1147745_rule

Vulnerability ID: V-275565

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.