SV-35028r1: The system must not apply reversed source routing to TCP responses. | HP-UX 11.31 Security Technical Implementation Guide

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Assessment Title

Rule Text

The system must not apply reversed source routing to TCP responses.

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.

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.

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:216
if [ ! -f "/etc/rc.config.d/nddconf" ]; then echo "PASS"; exit 0; fi
if grep -q "^TRANSPORT_NAME\[[0-9]+\]\ = ip$" "/etc/rc.config.d/nddconf" && grep -q "^NDD_NAME\[[0-9]+\]\ = ip_forward_src_routed$" "/etc/rc.config.d/nddconf" && grep -q "^NDD_VALUE\[[0-9]+\]\ = 0$" "/etc/rc.config.d/nddconf"; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Disable the IP source-routed forwarding feature.
# ndd -set /dev/ip ip_forward_src_routed 0

Edit /etc/rc.config.d/nddconf and add/set:
TRANSPORT_NAME[x] = ip
NDD_NAME[x] = ip_forward_src_routed
NDD_VALUE[x] = 0