cis-ubuntu1604-v200-3-5-1-1

name	cis-ubuntu1604-v200-3-5-1-1
description	Ensure ufw is installed
category	cis-networking
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","firewall"]
cis_id	3.5.1.1
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 3.5.1.1

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 -s ufw | grep 'Status: install'

Expected Result

Status: install ok installed

Remediation

Command Line

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

apt install ufw

References

None

CIS Controls

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.