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Disable Kernel cfg80211 Module

An XCCDF Rule

Description

To configure the system to prevent the cfg80211 kernel module from being loaded, add the following line to the file /etc/modprobe.d/cfg80211.conf: 

install cfg80211 /bin/true
To configure the system to prevent the cfg80211 from being used, add the following line to file /etc/modprobe.d/cfg80211.conf: 
blacklist cfg80211

Rationale

If Wireless functionality must be disabled, preventing the kernel from loading the kernel module provides an additional safeguard against its activation.

ID
xccdf_org.ssgproject.content_rule_kernel_module_cfg80211_disabled
Severity
Medium
References
Updated



Remediation - Kubernetes Patch

---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:

Remediation - Ansible

- name: Ensure kernel module 'cfg80211' is disabled
  lineinfile:
    create: true
    dest: /etc/modprobe.d/cfg80211.conf
    regexp: install\s+cfg80211
    line: install cfg80211 /bin/false

Remediation - Shell Script

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then

if LC_ALL=C grep -q -m 1 "^install cfg80211" /etc/modprobe.d/cfg80211.conf ; then
	
	sed -i 's#^install cfg80211.*#install cfg80211 /bin/true#g' /etc/modprobe.d/cfg80211.conf