cis-ubuntu1804-v220-3-4-1-2

name	cis-ubuntu1804-v220-3-4-1-2
description	Ensure iptables-persistent is not installed with ufw
category	cis-networking
version	2.2.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-18.04","networking","firewall","ufw"]
cis_id	3.4.1.2
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 3.4.1.2

Description

The iptables-persistent is a boot-time loader for netfilter rules, iptables plugin is used by ufw.

Rationale

Running both ufw and the services included in the iptables-persistent package may lead to conflict.

Impact

None.

Audit Procedure

Command Line

Run the following command to verify that the iptables-persistent package is not installed:

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

Nothing should be returned.

Expected Result

No output should be returned (the package is not installed).

Remediation

Command Line

Run the following command to remove the iptables-persistent package:

apt purge iptables-persistent

Default Value

iptables-persistent is not installed.

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