SV-38801r1: The system must ignore IPv4 ICMP redirect messages. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The system must ignore IPv4 ICMP redirect messages.

Description

Discussion Text

ICMP redirect messages are used by routers to inform hosts a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001503Not mappedCCI-001551

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.

#!/bin/bash
# Reconstructed from oval:mil.disa.fso.aix11:def:210
# The system must ignore IPv4 ICMP redirect messages.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# ipignoreredirects = 1
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^no:[^:]*
	ipignoreredirects = "([0-9]+)"/\1/p' '/etc/tunables/nextboot')" -eq 1 ]
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

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:210
if [ ! -f "/etc/tunables/nextboot" ]; then echo "PASS"; exit 0; fi
if grep -q "^no:[^:]*\nipignoreredirects = \"1\"" /etc/tunables/nextboot; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure the system to ignore IPv4 ICMP redirect messages. 
#/usr/sbin/no -p -o ipignoreredirects=1