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 screensaver lock-enabled setting for the graphical user interface.

DISA Rule

SV-282375r1200105_rule

Vulnerability Number

V-282375

Group Title

SRG-OS-000028-GPOS-00009

Rule Version

TOSS-05-000272

Severity

CAT II

CCI(s)

• CCI-000056 - Retain the device lock until the user reestablishes access using established identification and authentication procedures.
• CCI-000057 - The information system initiates a session lock after the organization-defined time period of inactivity.

Weight

10

Fix Recommendation

Configure TOSS 5 to prevent a user from overriding settings for graphical user interfaces.

Create a database to contain the systemwide screensaver settings (if it does not already exist) using the following command:

Note: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.

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

Add the following setting to prevent nonprivileged users from modifying it:

/org/gnome/desktop/screensaver/lock-enabled

Check Contents

Verify TOSS 5 prevents a user from overriding settings for graphical user interfaces.

Note: This requirement assumes the use of the TOSS 5 default graphical user interface—Gnome Shell. If the system does not have a graphical user interface installed, this requirement is not applicable.

Determine which profile the system database is using by running the following command:

$ sudo grep system-db /etc/dconf/profile/user

system-db:local

Check that graphical settings are locked from nonprivileged user modification using the following command:

Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used.

$ sudo grep -i lock-enabled /etc/dconf/db/local.d/locks/*

/org/gnome/desktop/screensaver/lock-enabled

If the command does not return at least the example result, this is a finding.

Vulnerability Number

V-282375

Documentable

False

Rule Version

TOSS-05-000272

Severity Override Guidance

Verify TOSS 5 prevents a user from overriding settings for graphical user interfaces.

Note: This requirement assumes the use of the TOSS 5 default graphical user interface—Gnome Shell. If the system does not have a graphical user interface installed, this requirement is not applicable.

Determine which profile the system database is using by running the following command:

$ sudo grep system-db /etc/dconf/profile/user

system-db:local

Check that graphical settings are locked from nonprivileged user modification using the following command:

Note: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used.

$ sudo grep -i lock-enabled /etc/dconf/db/local.d/locks/*

/org/gnome/desktop/screensaver/lock-enabled

If the command does not return at least the example result, this is a finding.

Check Content Reference

M

Target Key

5738