SV-29713r1: The system must not accept source-routed IPv4 packets. | HP-UX 11.23 Security Technical Implementation Guide

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Assessment Title

Rule Text

The system must not accept source-routed IPv4 packets.

Description

Discussion Text

Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the handling of source-routed traffic destined to the system itself, not to traffic forwarded by the system to another, such as when IPv4 forwarding is enabled and the system is functioning as a router.

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 11.23 DISA DPMS Target HP-UX 11.23 2170

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:218
# The system must not accept source-routed IPv4 packets.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# lsrr blocked in
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ 	]*block[ 	]+in[ 	]+(log[ 	]+)?(quick[ 	]+)?all[ 	]+with[ 	]+opt[ 	]+lsrr[ 	]*' '/etc/opt/ipf/ipf.conf' &>/dev/null
}
# ssrr blocked in
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^[ 	]*block[ 	]+in[ 	]+(log[ 	]+)?(quick[ 	]+)?all[ 	]+with[ 	]+opt[ 	]+ssrr[ 	]*' '/etc/opt/ipf/ipf.conf' &>/dev/null
}

if ( test_1 && test_2 ); 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.hpux11:def:218
if [ ! -f "/etc/opt/ipf/ipf.conf" ]; then echo "PASS"; exit 0; fi
if grep -q "^[ \t]*block[ \t]+in[ \t]+(log[ \t]+)?(quick[ \t]+)?all[ \t]+with[ \t]+opt[ \t]+lsrr[ \t]*" /etc/opt/ipf/ipf.conf; then echo "PASS"; exit 0; fi
if grep -q "^[ \t]*block[ \t]+in[ \t]+(log[ \t]+)?(quick[ \t]+)?all[ \t]+with[ \t]+opt[ \t]+ssrr[ \t]*" /etc/opt/ipf/ipf.conf; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Edit /etc/opt/ipf/ipf.conf and add rules to block incoming 
source-routed packets, such as:

block in log quick all with opt lsrr
block in log quick all with opt ssrr

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