The .Xauthority files must not have extended ACLs.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22446	GEN005190	SV-37682r1_rule	ECLP-1	Medium

Description
.Xauthority files ensure the user is authorized to access specific X Windows host. Extended ACLs may permit unauthorized modification of these files, which could lead to Denial of Service to authorized access or allow unauthorized access to be obtained.

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

Details

Check Text ( C-36869r2_chk )
Check the file permissions for the .Xauthority files. These files will be located in user home directories. Procedure: # ls -la ~username |egrep "(\.Xauthority|\.xauth)" If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text (F-31834r1_fix)
Remove the extended ACL from the file. # setfacl --remove-all .Xauthority