Ubuntu OS must have an application firewall enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-275610 | RIIM-OS-251020 | SV-275610r1147880_rule | CCI-000366 | 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 | |||
| Riverbed NetIM OS Security Technical Implementation Guide | 2025-10-02 | |||
Details
Check Text (C-275610r1147880_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-79617r1147879_fix)
Enable and start the ufw by using the following command:
$ sudo systemctl enable ufw.service --now