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Check: RIIM-OS-271025

Riverbed NetIM OS STIG: RIIM-OS-271025 (in version v1 r1)

Title

Ubuntu OS must initiate a graphical session lock after 15 minutes of inactivity. (Cat II impact)

Discussion

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Regardless of where the session lock is determined and implemented, once invoked, a session lock of Ubuntu OS must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.

Check Content

Verify Ubuntu OS has a graphical user interface session lock configured to activate after 15 minutes of inactivity by using the following commands: Note: If no graphical user interface is installed, this requirement is not applicable. Get the following settings to verify the graphical user interface session is configured to lock the graphical user session after 15 minutes of inactivity: $ gsettings get org.gnome.desktop.screensaver lock-enabled true $ gsettings get org.gnome.desktop.screensaver lock-delay uint32 0 $ gsettings get org.gnome.desktop.session idle-delay uint32 900 If "lock-enabled" is not set to "true", is commented out, or is missing, this is a finding. If "lock-delay" is set to a value greater than "0", or if "idle-delay" is set to a value greater than "900", is commented out, or is missing, this is a finding.

Fix Text

Configure Ubuntu OS to lock the current graphical user interface session after 15 minutes of inactivity. Create or edit a file named /etc/dconf/db/local.d/00-screensaver with the following contents: [org/gnome/desktop/screensaver] lock-enabled=true lock-delay=0 [org/gnome/desktop/session] idle-delay=600

Additional Identifiers

Rule ID: SV-275629r1147937_rule

Vulnerability ID: V-275629

Group Title: SRG-OS-000029-GPOS-00010

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000057	Prevent further access to the system by initiating a device lock after organization-defined time period of inactivity; and/or requiring the user to initiate a device lock before leaving the system unattended.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-11	Device Lock