The /etc/resolv.conf 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-38081r1_rule The /etc/resolv.conf file must not have an extended ACL.

Vulnerability discussion

The resolv.conf (or equivalent) file configures the system's DNS resolver. DNS is used to resolve host names to IP addresses. If DNS configuration is modified maliciously, host name resolution may fail or return incorrect information. DNS may be used by a variety of system security functions, such as time synchronization, centralized authentication, and remote system logging.

Check content

Open a terminal session and enter the following command to view the resolv.conf file extended ACLs. ls -lL /etc/resolv.conf 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/resolv.conf

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