The /etc/hosts file must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22326	GEN001369 M6	SV-38086r1_rule	ECLP-1	Medium

Description
The /etc/hosts file (or equivalent) configures local host name to IP address mappings typically taking precedence over DNS resolution. If this file is maliciously modified, it could cause the failure or compromise of security functions requiring name resolution, such as time synchronization, centralized authentication, and remote system logging.

STIG	Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide	2013-04-09

Details

Check Text ( C-37622r1_chk )
Open a terminal session and enter the following command to view the /etc/hosts file extended ACLs. ls -lL /etc/hosts If the permissions include a '+', the file has an extended ACL, this is a finding.

Fix Text (F-32864r1_fix)
Open a terminal session and enter the following command to remove the extended ACLs. chmod -N /etc/hosts