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 conceal via the session lock information previously visible on the display with a publicly viewable image.

DISA Rule

SV-282382r1200126_rule

Vulnerability Number

V-282382

Group Title

SRG-OS-000031-GPOS-00012

Rule Version

TOSS-05-000277

Severity

CAT II

CCI(s)

CCI-000060 - Conceal, via the device lock, information previously visible on the display with a publicly viewable image.

Weight

Fix Recommendation

Edit the "dconf" settings in the /etc/dconf/db/* location.

First, add or update the [org/gnome/desktop/screensaver] section of the "/etc/dconf/db/local.d/00-security-settings" database file and add or update the following lines:

[org/gnome/desktop/screensaver]
picture-uri=''

Add the following line to "/etc/dconf/db/local.d/locks/00-security-settings-lock" to prevent user modification:

/org/gnome/desktop/screensaver/picture-uri

Update the dconf system databases:

$ sudo dconf update

Check Contents

To ensure the screensaver is configured to be blank, run 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 a graphical user interface installed, this requirement is not applicable.

$ gsettings get org.gnome.desktop.screensaver picture-uri

If properly configured, the output should be "''".

To ensure that users cannot set the screensaver background, run the following:

$ grep picture-uri /etc/dconf/db/local.d/locks/*

If properly configured, the output should be "/org/gnome/desktop/screensaver/picture-uri".

If it is not set or configured properly, this is a finding.

Vulnerability Number

V-282382

Documentable

False

Rule Version

TOSS-05-000277

Severity Override Guidance

Check Content Reference

Target Key

5738