The .Xauthority utility must only permit access to authorized hosts.

If unauthorized clients are permitted access to the X server, a user's X session may be compromised.

If X Display Manager (XDM) is not used on the system, this is not applicable.

Determine if XDM is running.

Procedure: # ps -ef | grep xdm

Check the X Window system access is limited to authorized clients.

Procedure: # xauth xauth> list

Ask the SA if the clients listed are authorized.

If any are not, this is a finding.

Remove unauthorized clients from the xauth configuration.

Procedure: # xauth remove <display name>