SV-38701r1: The system must provide protection for the TCP stack against connection resets, SYN, and data injection attacks. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The system must provide protection for the TCP stack against connection resets, SYN, and data injection attacks.

Description

Discussion Text

The tcp_tcpsecure parameter provides protection for TCP connections from fake SYN's, fake RST, and data injections on established connections. The first vulnerability involves sending a fake SYN to an established connection to abort the connection. The second vulnerability involves sending a fake RST to an established connection to abort the connection. The third vulnerability involves injecting fake data in an established TCP connection.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000032

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:13
# The system must provide protection for the TCP stack against connection resets, SYN, and data injection attacks.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# NO stanza setting
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^[ 	]*tcp_tcpsecure[ 	]*=[ 	]*"([0-9]+)/\1/p' '/etc/tunables/lastboot')" -eq 7 ]
}

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:13
if [ ! -f "/etc/tunables/lastboot" ]; then echo "PASS"; exit 0; fi
grep -q "^[ \t]*tcp_tcpsecure[ \t]*=[ \t]*\"7\"" /etc/tunables/lastboot || echo "FAIL"; exit 1

Remediation

Set the tcp_tcpsecure parameter to 7.

# /usr/sbin/no -p -o tcp_tcpsecure=7