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

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38693r1_rule The /etc/hosts file must not have an extended ACL.

Vulnerability discussion

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

Check content

Verify /etc/hosts has no extended ACL. Check to see if extended permissions are disabled. Procedure: #aclget /etc/hosts If extended permissions are not disabled, this is a finding.

Fix text

Remove the extended ACL from the /etc/hosts file and disable extended permissions. #acledit /etc/hosts

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