Install iptables Package

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Description

The iptables package can be installed with the following command:


$ apt-get install iptables

Rationale

iptables controls the Linux kernel network packet filtering code. iptables allows system operators to set up firewalls and IP masquerading, etc.

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 ( [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] ); then

DEBIAN_FRONTEND=noninteractive apt-get install -y "iptables"

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: Ensure iptables is installed
  package:
    name: iptables
    state: present
  when: ( ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman",
    "container"] )
  tags:
  - NIST-800-53-CM-6(a)
  - PCI-DSS-Req-1.4.1
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - package_iptables_installed