The Ubuntu operating system must disable the x86 Ctrl-Alt-Delete key sequence if a graphical user interface is installed.
An XCCDF Rule
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.
- ID
- SV-238379r991589_rule
- Version
- UBTU-20-010459
- Severity
- High
- References
- Updated
Remediation Templates
A Manual Procedure
Configure the system to disable the Ctrl-Alt-Delete sequence when using a graphical user interface by creating or editing the /etc/dconf/db/local.d/00-disable-CAD file.
Add the setting to disable the Ctrl-Alt-Delete sequence for the graphical user interface:
[org/gnome/settings-daemon/plugins/media-keys]
logout=''