SV-204450r958820: The Red Hat Enterprise Linux operating system must be configured so that the Datagram Congestion Control Protocol (DCCP) kernel module is disabled unless required. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must be configured so that the Datagram Congestion Control Protocol (DCCP) kernel module is disabled unless required.

Description

Discussion Text

Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001958V-77821SV-92517

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify the operating system disables the ability to load the DCCP kernel module.

     # grep -r dccp /etc/modprobe.d/* | grep -i "/bin/false" | grep -v "^#"
     install dccp /bin/false

If the command does not return any output, or the line is commented out, and use of DCCP is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Verify the operating system disables the ability to use the DCCP kernel module.

Check to see if the DCCP kernel module is disabled with the following command:

     # grep -i dccp /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#"
     blacklist dccp

If the command does not return any output or the output is not "blacklist dccp", and use of the dccp kernel module is not documented with the ISSO as an operational requirement, this is a finding.

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.stig.rhel7os:def:204450
# The Red Hat Enterprise Linux operating system must be configured so that the Datagram Congestion Control Protocol (DCCP) kernel module is 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.

# /etc/modprobe.d contains a file that contains 'install dccp /bin/false'
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -rqP --include='*' '^[ \t]*install[ \t]+dccp[ \t]+/bin/false[ \t]*$' '/etc/modprobe.d' &>/dev/null
}
# /etc/modprobe.d contains a file that contains 'blacklist dccp'
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^[ \t]*blacklist[ \t]+dccp[ \t]*$' '/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:mil.disa.stig.rhel7os:def:204450
if [ ! -d "/etc/modprobe.d" ]; then echo "PASS"; exit 0; fi
if [ -s "/etc/modprobe.d/dccp.conf" ] && grep -q "^[ \t]*install[ \t]+dccp[ \t]+/bin/false[ \t]*$" /etc/modprobe.d/dccp.conf; then :; else echo "FAIL"; exit 1; fi
if [ -s "/etc/modprobe.d/blacklist.conf" ] && grep -q "^[ \t]*blacklist[ \t]+dccp[ \t]*$" /etc/modprobe.d/blacklist.conf; then :; else echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

Configure the operating system to disable the ability to use the DCCP kernel module.

Create a file under "/etc/modprobe.d" with the following command:

     # touch /etc/modprobe.d/dccp.conf

Add the following line to the created file:

     install dccp /bin/false

Ensure that the DCCP module is blacklisted: 

     # vi /etc/modprobe.d/blacklist.conf

Add or update the line:

     blacklist dccp