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Disable ATM Support

An XCCDF Rule

Description

The Asynchronous Transfer Mode (ATM) is a protocol operating on network, data link, and physical layers, based on virtual circuits and virtual paths. To configure the system to prevent the atm kernel module from being loaded, add the following line to the file /etc/modprobe.d/atm.conf: 

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

Rationale

Disabling ATM protects the system against exploitation of any flaws in its implementation.

ID
xccdf_org.ssgproject.content_rule_kernel_module_atm_disabled
Severity
Medium
References
Updated



Remediation - Ansible

- name: Ensure kernel module 'atm' is disabled
  lineinfile:
    create: true
    dest: /etc/modprobe.d/atm.conf
    regexp: install\s+atm
    line: install atm /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 atm" /etc/modprobe.d/atm.conf ; then
	
	sed -i 's#^install atm.*#install atm /bin/true#g' /etc/modprobe.d/atm.conf