.Xauthority or X*.hosts (or equivalent) file(s) must be used to restrict access to the X server.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-12016	GEN005220	SV-37684r1_rule	ECCD-1 ECCD-2	Medium

Description
If access to the X server is not restricted, a user's X session may be compromised.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-36875r1_chk )

Determine if the X server is running. Procedure: # ps -ef |grep X Determine if xauth is being used. Procedure: # xauth xauth> list If the above command sequence does not show any host other than the localhost, then xauth is not being used. Search the system for an X*.hosts file, where "*" is a display number used to limit X window connections. If no files are found, X*.hosts files are not being used. If the X*.hosts files contain any unauthorized hosts, this is a finding. If both xauth and X*.hosts files are not being used, this is a finding.

Fix Text (F-31858r1_fix)
Create an X*.hosts file, where "*" is a display number used to limit X window connections. Add the list of authorized X clients to the file.