SV-248830r991589: OL 8 must not have the Controller Area Network (CAN) kernel module installed if not required for operational support. | Oracle Linux 8 STIG SCAP Benchmark

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Assessment Title

Rule Text

OL 8 must not have the Controller Area Network (CAN) kernel module installed if not required for operational support.

Description

Discussion Text

The CAN protocol is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer. Disabling CAN protects the system against exploitation of any flaws in its implementation.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Oracle Linux 8 DISA DPMS Target Oracle Linux 8 5416

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.ol8os:def:248830
# OL 8 must not have the Controller Area Network (CAN) kernel module installed if not required for operational support.
# 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 can /bin/false'
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -rqP --include='*' '^[ \t]*install[ \t]+can[ \t]+/bin/false[ \t]*$' '/etc/modprobe.d' &>/dev/null
}
# /etc/modprobe.d contains a file that contains 'blacklist can'
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^[ \t]*blacklist[ \t]+can[ \t]*$' '/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 Definition: oval:mil.disa.stig.ol8os:def:248830

if [ ! -d "/etc/modprobe.d" ]; then echo "PASS"; exit 0; fi
if [ -f "/etc/modprobe.d/can.conf" ]; then grep -q "^[ \t]*install[ \t]+can[ \t]+/bin/false[ \t]*$" /etc/modprobe.d/can.conf && grep -q "^[ \t]*blacklist[ \t]+can[ \t]*$" /etc/modprobe.d/blacklist.conf && echo "PASS" && exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure OL 8 to disable the ability to use the "can" kernel module. 
 
Create a file under "/etc/modprobe.d" with the following command: 
 
     $ sudo touch /etc/modprobe.d/can.conf 
 
Add the following line to the created file: 
 
     install can /bin/false
 
Configure OL 8 to disable the ability to use the can kernel module. 
 
     $ sudo vi /etc/modprobe.d/blacklist.conf 
 
Add or update the line: 
 
     blacklist can