Title

All .Xauthority files must have mode 0600 or less permissive. (Cat II impact)

Discussion

.Xauthority files ensure the user is authorized to access the specific X Windows host. Excessive permissions 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 in the home directories of users of X. Procedure: # cd ~<X user> # ls -lL .Xauthority If the file mode is more permissive than 0600, this is finding.

Fix Text

Change the mode of the .Xauthority files. Procedure: # chmod 0600 .Xauthority

Additional Identifiers

Rule ID: SV-227869r603266_rule

Vulnerability ID: V-227869

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.