STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must disable the ability of a user to accidentally press Ctrl-Alt-Del and cause a system to shut down or reboot.

DISA Rule

SV-282718r1201134_rule

Vulnerability Number

V-282718

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000281

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS 5 to ignore the Ctrl-Alt-Del sequence in the GNOME desktop.

Add or update the [org/gnome/settings-daemon/plugins/media-keys] section of the /etc/dconf/db/local.d/00-security-settings database file and add or update the following lines:

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

Run the following command to update the database:

$ sudo dconf update

Check Contents

Verify TOSS 5 is configured to ignore the Ctrl-Alt-Del sequence in the GNOME desktop using the following command:

Note: This requirement assumes the use of the TOSS 5 default graphical user interface, the GNOME desktop environment. If the system does not have any graphical user interface installed, this requirement is not applicable.

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

"['']"

If the GNOME desktop is configured to shut down when Ctrl-Alt-Del is pressed, this is a finding.

Vulnerability Number

V-282718

Documentable

False

Rule Version

TOSS-05-000281

Severity Override Guidance

Check Content Reference

Target Key

5738