TOSS 5 must prevent a user from overriding the disabling of the graphical user interface autorun function.

Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163

Verify TOSS 5 disables the user's ability to override the graphical user interface autorun 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

Check that 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". This path must be modified if a database other than "local" is being used.

$ grep 'autorun-never' /etc/dconf/db/local.d/locks/* 

/org/gnome/desktop/media-handling/autorun-never

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

Configure the GNOME desktop to not allow a user to change the setting that disables autorun on 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/autorun-never

Update the dconf system databases:

$ sudo dconf update