TOSS 5 must disable the graphical user interface automount function unless required.

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

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.

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