TOSS 5 must disable the graphical user interface automount function unless required.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282498 | TOSS-05-000264 | SV-282498r1200474_rule | CCI-000778 | medium |
| Description | ||||
| Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163 | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282498r1200474_chk)
Verify TOSS 5 disables the graphical user interface automount function 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 a graphical user interface installed, this requirement is not applicable.
$ gsettings get org.gnome.desktop.media-handling automount-open
false
If "automount-open" is set to "true" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Fix Text (F-86964r1200473_fix)
Configure the GNOME desktop to disable automated mounting of removable media.
The dconf settings can be edited in the /etc/dconf/db/* location.
Update the [org/gnome/desktop/media-handling] section of the "/etc/dconf/db/local.d/00-security-settings" database file and add or update the following lines:
[org/gnome/desktop/media-handling]
automount-open=false
Update the dconf system databases:
$ sudo dconf update