SV-35241r1: The system must ignore IPv6 Internet Control Message Protocol (ICMP ) redirect messages. | HP-UX 11.31 Security Technical Implementation Guide

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Assessment Title

Rule Text

The system must ignore IPv6 Internet Control Message Protocol (ICMP ) redirect messages.

Description

Discussion Text

ICMP redirect messages are used by routers to inform hosts of a more direct route existing 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-001551

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-1

References

DPMS Target HP-UX 11.31 DISA DPMS Target HP-UX 11.31 2171

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.hpux11:def:392
# The system must ignore IPv6 Internet Control Message Protocol (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.

# icmpv6 redirects blocked in
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ 	]*block[ 	]+in[ 	]+(log[ 	]+)?(quick[ 	]+)?proto[ 	]+icmpv6[ 	]+from[ 	]+any[ 	]+to[ 	]+any[ 	]+icmpv6-type[ 	]+137[ 	]*' '/etc/opt/ipf/ipf6.conf' &>/dev/null
}

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
# Shell script implementing OVAL definition oval:mil.disa.fso.hpux11:def:392

FILE="/etc/opt/ipf/ipf6.conf"
PATTERN="^[ \t]*block[ \t]+in[ \t]+(log[ \t]+)?(quick[ \t]+)?proto[ \t]+icmpv6[ \t]+from[ \t]+any[ \t]+to[ \t]+any[ \t]+icmpv6-type[ \t]+137[ \t]*"

if [ ! -f "$FILE" ]; then
  echo "FAIL"
  exit 1
fi

if grep -P "$PATTERN" "$FILE" > /dev/null; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Add an IPF rule to block inbound IPv6 ICMP redirect packets.

Edit /etc/opt/ipf/ipf6.conf and add a rule such as:
block in quick proto icmpv6 from any to any icmpv6-type 137

Reload the IPF rules.
# ipf -6 -Fa -A -f /etc/opt/ipf/ipf6.conf