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

From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide

Associated with: CCI-000056

SV-90117r3_rule The Ubuntu operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures.

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

Check content

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

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

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