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Check: GEN005190

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN005190 (in versions v1 r14 through v1 r10)

Title

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

Discussion

.Xauthority files ensure the user is authorized to access that 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

Get a list of (non-system account) users and the associated home directories. # cat /etc/passwd | cut -f 1,6 -d ":" Check the file permissions for the user .Xauthority files. #aclget .Xauthority Check if extended permissions are disabled. If extended permissions are not disabled, this is a finding.

Fix Text

Remove the extended ACL from the .Xauthority file(s) and disable extended permissions. #acledit .Xauthority

Additional Identifiers

Rule ID: SV-38814r1_rule

Vulnerability ID: V-22446

Group Title: GEN005190

Expert Comments

Expert comments are only available to logged-in users.

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