Canonical Ubuntu STIG Version Comparison

There are 171 differences between versions v1 r1 (July 26, 2017) (the "left" version) and v1 r2 (April 26, 2019) (the "right" version).

Check UBTU-16-010631 was added to the benchmark in the "right" version.

This check's original form is available here.

Title

The x86 Ctrl-Alt-Delete key sequence in the Ubuntu operating system must be disabled if GNOME is installed.

Check Content

Verify the Ubuntu operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using GNOME. Check that the "logout" target is not bound to an action with the following command: # grep logout /etc/dconf/db/local.d/* logout='' If the "logout" key is bound to an action, is commented out, or is missing, 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. In the GNOME 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.

Fix

Configure the system to disable the Ctrl-Alt-Delete sequence when using GNOME 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 GNOME: [org/gnome/settings-daemon/plugins/media-keys] logout=’’ Then update the dconf settings: # dconf update