Ubuntu operating system sessions must be automatically logged out after 15 minutes of inactivity.

From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide

Associated with: CCI-000057

SV-90121r2_rule Ubuntu operating system sessions must be automatically logged out after 15 minutes of inactivity.

Vulnerability discussion

An Ubuntu operating system needs to be able to identify when a user's sessions has idled for longer than 15 minutes. The Ubuntu operating system must logout a users' session after 15 minutes to prevent anyone from gaining access to the machine while the user is away.

Check content

Verify the Ubuntu operating system initiates a session logout after a "15" minutes of inactivity. Check that the proper auto logout script exists with the following command: # cat /etc/profile.d/autologout.sh TMOUT=900 readonly TMOUT export TMOUT If the file "/etc/profile.d/autologout.sh" does not exist, the timeout values are commented out, the output from the function call are not the same, this is a finding.

Fix text

Configure the Ubuntu operating system to initiate a session logout after a "15" minutes 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: TMOUT=900 readonly TMOUT export TMOUT

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