The Ubuntu operating system must have an application firewall enabled.
An XCCDF Rule
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.
- ID
- SV-238374r991593_rule
- Version
- UBTU-20-010454
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
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