cis-ubuntu2004-v300-4-4-1-1

name	cis-ubuntu2004-v300-4-4-1-1
description	Ensure iptables packages are installed
category	cis-networking
version	3.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-20.04","firewall","iptables"]
cis_id	4.4.1.1
cis_benchmark	CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 - Control 4.4.1.1

Profile

• Level: Level 1 - Server, Level 1 - Workstation
• Assessment Status: Automated

Description

iptables is a utility program that allows a system administrator to configure the tables provided by the Linux kernel firewall, implemented as different Netfilter modules, and the chains and rules it stores. Different kernel modules and programs are used for different protocols; iptables applies to IPv4, ip6tables to IPv6, arptables to ARP, and ebtables to Ethernet frames.

Rationale

A method of configuring and maintaining firewall rules is necessary to configure a Host Based Firewall.

Audit Procedure

Command Line

Run the following command to verify that iptables is installed:

dpkg-query -s iptables &>/dev/null && echo "iptables is installed"

Run the following command to verify that iptables-persistent is installed:

dpkg-query -s iptables-persistent &>/dev/null && echo "iptables-persistent is installed"

Expected Result

iptables is installed
iptables-persistent is installed

Remediation

Command Line

Run the following command to install iptables and iptables-persistent:

apt install iptables iptables-persistent

Default Value

Not applicable.

References

1. NIST SP 800-53 Rev. 5: CA-9, SC-7

CIS Controls

v8 - 4.4 Implement and Manage a Firewall on Servers v8 - 4.5 Implement and Manage a Firewall on End-User Devices v7 - 9.4 Apply Host-based Firewalls or Port Filtering

MITRE ATT&CK Mappings: T1562, T1562.004 | TA0011 | M1031, M1037