SV-37763r1: The Datagram Congestion Control Protocol (DCCP) must be disabled unless required. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The Datagram Congestion Control Protocol (DCCP) must be disabled unless required.

Description

Discussion Text

The DCCP is a proposed transport layer protocol. This protocol is not yet widely used. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local processes may be able to cause the system to dynamically load a protocol handler by opening a socket using the protocol.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000382CCE-14268-7

Additional Details

Responsibility

System Administrator

IA Controls

ECSC-1

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

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.rhel11:def:402
# The Datagram Congestion Control Protocol (DCCP) must be disabled unless required.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# check for DCCP in /etc/modprobe.conf
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ 	

]*install[ 	

]+dccp[ 	

]+/bin/true' '/etc/modprobe.conf' &>/dev/null
}
# check for DCCP in /etc/modprobe.d/*
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^[ 	

]*install[ 	

]+dccp[ 	

]+/bin/true' '/etc/modprobe.d' &>/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.rhel11:def:402

if [ -f /etc/modprobe.conf ] && grep -q "^[ \t\n\r]*install[ \t\n\r]+dccp[ \t\n\r]+/bin/true" /etc/modprobe.conf; then
    echo "PASS"
    exit 0
elif [ -d /etc/modprobe.d ] && find /etc/modprobe.d -type f -name "*.conf" -exec grep -q "^[ \t\n\r]*install[ \t\n\r]+dccp[ \t\n\r]+/bin/true" {} \; ; then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Prevent the DCCP protocol handler for dynamic loading.
# echo "install dccp /bin/true" >> /etc/modprobe.conf
# echo "install dccp_ipv4 /bin/true" >> /etc/modprobe.conf
# echo "install dccp_ipv6 /bin/true" >> /etc/modprobe.conf