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← Back to SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

V-22322

CAT II (Medium)

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

Rule ID

SV-44978r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000225

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

Verify /etc/resolv.conf has no extended ACL.
# ls -l /etc/resolv.conf
If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text

Remove the extended ACL from the file.
# setfacl --remove-all /etc/resolv.conf