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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-234989	SLES-15-040061	SV-234989r622137_rule		High

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 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.

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 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.

STIG	Date
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide	2021-06-14

Details

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 false If the logout value is not [''] and the writable status is not false, this is a finding.

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
false

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: /etc/dconf/profile/user user-db:user system-db:local 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: /etc/dconf/db/local.d/01-fips-settings [org/gnome/settings-daemon/plugins/media-keys] logout=[''] /etc/dconf/db/local.d/locks/01-fips-locks /org/gnome/settings-daemon/plugins/media-keys/logout 4. Update the dconf database: > sudo dconf update

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:

/etc/dconf/profile/user
user-db:user
system-db:local

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:

/etc/dconf/db/local.d/01-fips-settings
[org/gnome/settings-daemon/plugins/media-keys]
logout=['']

/etc/dconf/db/local.d/locks/01-fips-locks
/org/gnome/settings-daemon/plugins/media-keys/logout

4. Update the dconf database:

> sudo dconf update