SV-38963r1: The DHCP client must not send dynamic DNS updates. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The DHCP client must not send dynamic DNS updates.

Description

Discussion Text

Dynamic DNS updates transmit unencrypted information about a system including its name and address and should not be used unless needed.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-1

References

DPMS Target AIX 6.1 DISA DPMS Target AIX 6.1 2176

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.fso.aix11:def:365


if grep -q "^updateDNS" /etc/dhcpcd.ini; then echo "FAIL"; exit 1; fi
if grep -q "^updateDNS" /etc/dhcpc.opt; then echo "FAIL"; exit 1; fi
echo "PASS"
exit 0

Remediation

Configure the system's DHCP client to not send dynamic DNS updates.  

Remove / comment updateDNS lines from the /etc/dhcpcd.ini and /etc/dhcpc.opt files.