The alias file must not have an extended ACL.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38131r1_rule The alias file must not have an extended ACL.

Vulnerability 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

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