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 disabling of the graphical user interface automount function.

DISA Rule

SV-282499r1200477_rule

Vulnerability Number

V-282499

Group Title

SRG-OS-000114-GPOS-00059

Rule Version

TOSS-05-000265

Severity

CAT II

CCI(s)

• CCI-000778 - Uniquely identify organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection.
• CCI-001958 - Authenticate organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection.

Weight

10

Fix Recommendation

Configure the GNOME desktop to not allow a user to change the setting that disables automated mounting of removable media.

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

/org/gnome/desktop/media-handling/automount-open

Update the dconf system databases:

$ sudo dconf update

Check Contents

Verify TOSS 5 disables ability of the user to override the graphical user interface automount setting.

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.

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

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

system-db:local

Verify the automount setting is 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". Modify this path if using a database other than "local".

$ grep 'automount-open' /etc/dconf/db/local.d/locks/*

/org/gnome/desktop/media-handling/automount-open

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

Vulnerability Number

V-282499

Documentable

False

Rule Version

TOSS-05-000265

Severity Override Guidance

Verify TOSS 5 disables ability of the user to override the graphical user interface automount setting.

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.

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

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

system-db:local

Verify the automount setting is 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". Modify this path if using a database other than "local".

$ grep 'automount-open' /etc/dconf/db/local.d/locks/*

/org/gnome/desktop/media-handling/automount-open

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

Check Content Reference

M

Target Key

5738