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UBTU-22-251020 Ubuntu 22.04 LTS must have an application firewall enabled.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

Ubuntu 22.04 LTS must have an application firewall enabled.

Control

Verify the ufw is enabled on the system with the following command: $ sudo ufw status Status: active If the above command returns the status as "inactive" or any type of error, this is a finding. If the ufw is not installed, ask the system administrator if another application firewall is installed. If a different firewall is active on the system, this is not a finding.

Discussion

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.

Related controls

CCI-000366

Fix

Enable the ufw by using the following command: $ sudo ufw enable Note: Enabling the firewall will potentially disrupt ssh sessions.