STIGQter: STIG Summary: Riverbed NetIM OS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 11 Sep 2025:

Ubuntu OS must disable the x86 Ctrl-Alt-Delete key sequence if a graphical user interface is installed.

DISA Rule

SV-275630r1147940_rule

Vulnerability Number

V-275630

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RIIM-OS-271030

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure Ubuntu OS to disable the Ctrl-Alt-Delete sequence when using a graphical user interface.

Create or edit a file named /etc/dconf/db/local.d/00-screensaver with the following contents:

[org/gnome/settings-daemon/plugins/media-keys]
logout=""

Update the dconf settings:

$ sudo dconf update

Check Contents

Verify Ubuntu OS is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using a graphical user interface by using the following command:

Note: If no graphical user interface is installed, this requirement is not applicable.

$ gsettings get org.gnome.settings-daemon.plugins.media-keys logout
@as []

If the "logout" key is bound to an action, is commented out, or is missing, this is a finding.

Vulnerability Number

V-275630

Documentable

False

Rule Version

RIIM-OS-271030

Severity Override Guidance

Verify Ubuntu OS is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using a graphical user interface by using the following command:

Note: If no graphical user interface is installed, this requirement is not applicable.

$ gsettings get org.gnome.settings-daemon.plugins.media-keys logout
@as []

If the "logout" key is bound to an action, is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5706