The .Xauthority files must not have extended ACLs.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-63285r1_rule The .Xauthority files must not have extended ACLs.

Vulnerability discussion

.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.

Check content

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

Remove the extended ACL from the file. # setfacl --remove-all .Xauthority

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