|Finding ID||Version||Rule ID||IA Controls||Severity|
|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.|
|Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide||2022-12-06|
|Check Text ( C-41584r654295_chk )|
| Verify the Uncomplicated Firewall is enabled on the system by running the following command: |
$ systemctl status ufw.service | grep -i "active:"
Active: active (exited) since Mon 2016-10-17 12:30:29 CDT; 1s ago
If the above command returns the status as "inactive", this is a finding.
If the Uncomplicated Firewall 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-41543r654296_fix)|
| Enable the Uncomplicated Firewall by using the following command: |
$ sudo systemctl enable ufw.service
If the Uncomplicated Firewall is not currently running on the system, start it with the following command:
$ sudo systemctl start ufw.service