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Check: GEN004390 M6

MACOSX 10.6: GEN004390 M6 (in version v1 r3)

Title

The alias file must not have an extended ACL. (Cat II impact)

Discussion

Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect email.

Check Content

Open a terminal session and enter the following command to view the /etc/aliases file extended ACLs. ls -lL /etc/aliases If the permissions include a '+', the file has an extended ACL, this is a finding.

Fix Text

Open a terminal session and enter the following command to remove the extended ACLs. chmod -N /etc/aliases

Additional Identifiers

Rule ID: SV-38131r1_rule

Vulnerability ID: V-22439

Group Title:

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