Disable TIPC Support

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Description

The Transparent Inter-Process Communication (TIPC) protocol is designed to provide communications between nodes in a cluster. To configure the system to prevent the tipc kernel module from being loaded, add the following line to the file /etc/modprobe.d/tipc.conf:

install tipc /bin/false

This entry will cause a non-zero return value during a tipc module installation and additionally convey the meaning of the entry to the user in form of an error message. If you would like to omit a non-zero return value and an error message, you may want to add a different line instead (both /bin/true and /bin/false are allowed by OVAL and will be accepted by the scan):

install tipc /bin/true

Rationale

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

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if rpm --quiet -q kernel-core; then

if LC_ALL=C grep -q -m 1 "^install tipc" /etc/modprobe.d/tipc.conf ; then
	
	sed -i 's#^install tipc.*#install tipc /bin/false#g' /etc/modprobe.d/tipc.conf
else
	echo -e "\n# Disable per security requirements" >> /etc/modprobe.d/tipc.conf
	echo "install tipc /bin/false" >> /etc/modprobe.d/tipc.conf
fi

if ! LC_ALL=C grep -q -m 1 "^blacklist tipc$" /etc/modprobe.d/tipc.conf ; then
	echo "blacklist tipc" >> /etc/modprobe.d/tipc.conf
fi

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - CCE-86569-1
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_tipc_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required

- name: Ensure kernel module 'tipc' is disabled
  ansible.builtin.lineinfile:
    create: true
    dest: /etc/modprobe.d/tipc.conf
    regexp: install\s+tipc
    line: install tipc /bin/false
  when: '"kernel-core" in ansible_facts.packages'
  tags:
  - CCE-86569-1
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_tipc_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required

- name: Ensure kernel module 'tipc' is blacklisted
  ansible.builtin.lineinfile:
    create: true
    dest: /etc/modprobe.d/tipc.conf
    regexp: ^blacklist tipc$
    line: blacklist tipc
  when: '"kernel-core" in ansible_facts.packages'
  tags:
  - CCE-86569-1
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_tipc_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required

Warning

This configuration baseline was created to deploy the base operating system for general purpose workloads. When the operating system is configured for certain purposes, such as a node in High Performance Computing cluster, it is expected that the tipc kernel module will be loaded.