SV-248829r991589: OL 8 must not have the asynchronous transfer mode (ATM) 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 asynchronous transfer mode (ATM) kernel module installed if not required for operational support.

Description

Discussion Text

The ATM is a transport layer protocol designed for digital transmission of multiple types of traffic, including telephony (voice), data, and video signals, in one network without the use of separate overlay networks. Disabling ATM 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:248829
# OL 8 must not have the asynchronous transfer mode (ATM) 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 atm /bin/false'
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -rqP --include='*' '^[ \t]*install[ \t]+atm[ \t]+/bin/false[ \t]*$' '/etc/modprobe.d' &>/dev/null
}
# /etc/modprobe.d contains a file that contains 'blacklist atm'
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^[ \t]*blacklist[ \t]+atm[ \t]*$' '/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
# DISA STIG OL 8 def:oval:mil.disa.stig.ol8os:def:248829 compliance check

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

Remediation

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