The /etc/resolv.conf file must be group-owned by bin, sys, or system.

From AIX 6.1 Security Technical Implementation Guide

Part of GEN001363

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-39099r1_rule The /etc/resolv.conf file must be group-owned by bin, sys, or system.

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.

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Change the group owner of the /etc/resolv.conf file to bin, sys, or system. Procedure: # chgrp system /etc/resolv.conf

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