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 prevent a user from overriding the Ctrl-Alt-Del sequence settings for the graphical user interface.

DISA Rule

SV-282719r1201137_rule

Vulnerability Number

V-282719

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000282

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS 5 to disallow the user changing the Ctrl-Alt-Del sequence in the GNOME desktop.

Create a database to container systemwide graphical user logon settings (if it does not already exist) using the following command:

$ sudo touch /etc/dconf/db/local.d/locks/session

Add the following line to the session locks file to prevent nonprivileged users from modifying the Ctrl-Alt-Del setting:

/org/gnome/settings-daemon/plugins/media-keys/logout

Run the following command to update the database:

$ sudo dconf update

Check Contents

Verify users cannot enable 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.

$ grep logout /etc/dconf/db/local.d/locks/*

/org/gnome/settings-daemon/plugins/media-keys/logout

If the output is not "/org/gnome/settings-daemon/plugins/media-keys/logout", the line is commented out, or the line is missing, this is a finding.

Vulnerability Number

V-282719

Documentable

False

Rule Version

TOSS-05-000282

Severity Override Guidance

Check Content Reference

Target Key

5738