The Ubuntu operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75437	UBTU-16-010040	SV-90117r3_rule		Medium

Description
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, the session lock shall remain in place until the user re-authenticates. No other activity aside from re-authentication shall unlock the system.

Description

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, the session lock shall remain in place until the user re-authenticates. No other activity aside from re-authentication shall unlock the system.

STIG	Date
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75141r3_chk )
Verify the operating system allows a user to lock the current graphical user interface (GUI) session. Note: If the Ubuntu operating system does not have GNOME installed, this requirement is Not Applicable. Check to see if the Ubuntu operating system allows the user to lock the current GUI session with the following command: # gsettings get org.gnome.desktop.lock-enabled true If "lock-enabled" is not set to "true", this is a finding.

Check Text ( C-75141r3_chk )

Verify the operating system allows a user to lock the current graphical user interface (GUI) session.

Note: If the Ubuntu operating system does not have GNOME installed, this requirement is Not Applicable.

Check to see if the Ubuntu operating system allows the user to lock the current GUI session with the following command:

# gsettings get org.gnome.desktop.lock-enabled

true

If "lock-enabled" is not set to "true", this is a finding.

Fix Text (F-82065r2_fix)
Configure the Ubuntu operating system so that it allows a user to lock the current GUI session. Note: If the Ubuntu operating system does not have GNOME installed, this requirement is Not Applicable. Set the "lock-enabled" setting in GNOME to allow GUI session locks with the following command: Note: The command must be performed from a terminal window inside the graphical user interface (GUI). # sudo gsettings set org.gnome.desktop.lock-enabled true

Fix Text (F-82065r2_fix)

Configure the Ubuntu operating system so that it allows a user to lock the current GUI session.

Note: If the Ubuntu operating system does not have GNOME installed, this requirement is Not Applicable.

Set the "lock-enabled" setting in GNOME to allow GUI session locks with the following command:

Note: The command must be performed from a terminal window inside the graphical user interface (GUI).

# sudo gsettings set org.gnome.desktop.lock-enabled true