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V-275628

CAT II (Medium)

Ubuntu OS must retain a user's session lock until that user reestablishes access using established identification and authentication procedures.

Rule ID

SV-275628r1147934_rule

STIG

Riverbed NetIM OS Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000056

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 enabled by using the following command: 
  
Note: If no graphical user interface is installed, this requirement is not applicable. 
  
     $ sudo gsettings get org.gnome.desktop.screensaver lock-enabled 
     true 
  
If "lock-enabled" is not set to "true", is commented out, or is missing, this is a finding.

Fix Text

Configure Ubuntu OS to allow a user to lock the current graphical user interface session.   
  
Create or edit a file named /etc/dconf/db/local.d/00-screensaver with the following contents:

[org/gnome/desktop/screensaver]
lock-enabled=true