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The Ubuntu operating system must initiate a session lock after a 15-minute period of inactivity for all connection types.


Finding ID Version Rule ID IA Controls Severity
V-219303 UBTU-18-010402 SV-219303r610963_rule Medium
A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, the Ubuntu operating system need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-21028r305237_chk )
Verify the Ubuntu operating system initiates a session logout after a 15-minute period of inactivity.

Check that the proper auto logout script exists with the following command:

# cat /etc/profile.d/autologout.sh
readonly TMOUT
export TMOUT

If the file "/etc/profile.d/autologout.sh" does not exist with the contents shown above, the value of "TMOUT" is greater than 900, or the timeout values are commented out, this is a finding.
Fix Text (F-21027r305238_fix)
Configure the Ubuntu operating system to initiate a session logout after a 15-minute period of inactivity.

Create a file to contain the system-wide session auto logout script (if it does not already exist) with the following command:

# sudo touch /etc/profile.d/autologout.sh

Add the following lines to the "/etc/profile.d/autologout.sh" script:

readonly TMOUT
export TMOUT