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. Rather than be forced to wait for a period of time to expire before the user session can be locked, Ubuntu 24.04 LTSs need to provide users with the ability to manually invoke a session lock so users may secure their session if they need to temporarily vacate the immediate physical vicinity.

Satisfies: SRG-OS-000031-GPOS-00012, SRG-OS-000030-GPOS-00011

Check

Verify Ubuntu 24.04 LTS has the "vlock" package installed with the following command:

$ dpkg -l | grep vlock
ii vlock 2.2.2-10 amd64 Virtual Console locking program

If "vlock" is not installed, this is a finding.

Fix

Install the "vlock" package (if it is not already installed) by running the following command:

$ sudo apt install -y vlock