Ubuntu 22.04 LTS must have an application firewall enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260516	UBTU-22-251020	SV-260516r953361_rule		Medium

Description
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

STIG	Date
Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide	2024-03-21

Details

Check Text ( C-64245r953359_chk )
Verify the Uncomplicated Firewall (ufw) is enabled on the system with the following command: $ systemctl status ufw.service \| grep -i "active:" Active: active (exited) since Thu 2022-12-25 00:00:01 NZTD; 365 days 11h ago If "ufw.service" is "inactive", this is a finding. If the ufw is not installed, ask the system administrator if another application firewall is installed. If no application firewall is installed, this is a finding.

Check Text ( C-64245r953359_chk )

Verify the Uncomplicated Firewall (ufw) is enabled on the system with the following command:

$ systemctl status ufw.service | grep -i "active:"
Active: active (exited) since Thu 2022-12-25 00:00:01 NZTD; 365 days 11h ago

If "ufw.service" is "inactive", this is a finding.

If the ufw is not installed, ask the system administrator if another application firewall is installed. If no application firewall is installed, this is a finding.

Fix Text (F-64153r953360_fix)
Enable and start the ufw by using the following command: $ sudo systemctl enable ufw.service --now