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Check: GEN005190

SUSE Linux Enterprise Server v11 for System z STIG: GEN005190 (in versions v1 r12 through v1 r9)

Title

The .Xauthority files must not have extended ACLs. (Cat II impact)

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. Procedure: # ls -la |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

Additional Identifiers

Rule ID: SV-45919r1_rule

Vulnerability ID: V-22446

Group Title: GEN005190

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

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

Number	Title
AC-6	Least Privilege