cis-ubuntu1804-v220-3-4-1-1

name	cis-ubuntu1804-v220-3-4-1-1
description	Ensure ufw is installed
category	cis-networking
version	2.2.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-18.04","networking","firewall","ufw"]
cis_id	3.4.1.1
cis_benchmark	CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 3.4.1.1

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 built in netfilter framework and provide protection against unwanted network traffic.

Impact

None.

Audit Procedure

Command Line

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

dpkg-query -s ufw | grep 'Status: install ok installed'

Expected Result

Status: install ok installed

Remediation

Command Line

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

apt install ufw

Default Value

ufw is installed by default on Ubuntu.

References

1. NIST SP 800-53 Rev. 5: CA-9, SC-7
2. CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0

CIS Controls

Version 8

4.4 Implement and Manage a Firewall on Servers - Implement and manage a firewall on servers, where supported.

4.5 Implement and Manage a Firewall on End-User Devices - Implement and manage a host-based firewall or port-filtering tool on end-user devices.

Version 7

9.4 Apply Host-based Firewalls or Port Filtering - Apply host-based firewalls or port filtering tools on end systems, with a default-deny rule that drops all traffic except those services and ports that are explicitly allowed.

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Assessment Status

Automated