Ubuntu 22.04 LTS must have an application firewall enabled.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-260516	SRG-OS-000480-GPOS-00232	UBTU-22-251020	SV-260516r991593_rule	2025-03-03	2

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.

ℹ️ Check
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.

ℹ️ Check

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
Enable and start the ufw by using the following command: $ sudo systemctl enable ufw.service --now