cis-ubuntu2004-v300-4-2-1

name	cis-ubuntu2004-v300-4-2-1
description	Ensure ufw is installed
category	cis-networking
version	3.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-20.04","firewall","ufw"]
cis_id	4.2.1
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 4.2.1

Profile

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

Description

The Uncomplicated Firewall (ufw) is a frontend for iptables and is particularly well-suited for host-based firewalls. ufw provides a framework for managing netfilter, as well as a command-line interface for manipulating the firewall

Rationale

A firewall utility is required to configure the Linux kernel's netfilter framework via the iptables or nftables back-end.

The Linux kernel's netfilter framework host-based firewall can protect against threats originating from within a corporate network to include malicious mobile code and poorly configured software on a host.

Note: Only one firewall utility should be installed and configured. UFW is dependent on the iptables package

Audit Procedure

Command Line

Run the following command to verify that Uncomplicated Firewall (UFW) is installed:

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

Expected Result

ufw is installed

Remediation

Command Line

Run the following command to install Uncomplicated Firewall (UFW):

apt install ufw

Default Value

Not applicable.

References

1. NIST SP 800-53 Rev. 5: 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