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The SUSE operating system must disable the x86 Ctrl-Alt-Delete key sequence for Graphical User Interfaces.


Finding ID Version Rule ID IA Controls Severity
V-234989 SLES-15-040061 SV-234989r622137_rule High
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 user interface environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide 2022-12-07


Check Text ( C-38177r619236_chk )
Note: If a graphical user interface is not installed, this requirement is Not Applicable.

Verify the SUSE operating system is not configured to reboot the system
when Ctrl-Alt-Delete is pressed in the graphical user interface.

Check that the dconf setting was disabled to allow the Ctrl-Alt-Delete
sequence in the graphical user interface with the following command:

Check the default logout key sequence:

> sudo gsettings get org.gnome.settings-daemon.plugins.media-keys logout

Check that the value is not writable and cannot be changed by the user:

> sudo gsettings writable org.gnome.settings-daemon.plugins.media-keys logout

If the logout value is not [''] and the writable status is not false, this
is a finding.
Fix Text (F-38140r619237_fix)
Configure the system to disable the Ctrl-Alt-Delete sequence for the
graphical user interface.

Create a database to contain the system-wide setting (if it does not
already exist) with the following steps:

1. Create a user profile and with the listed content:


2. Create the following directories:

> sudo mkdir -p /etc/dconf/db/local.d/
> sudo mkdir -p /etc/dconf/db/local.d/locks/

3. Add the following files with the listed content:



4. Update the dconf database:

> sudo dconf update