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An application firewall must be enabled on the system.


Overview

Finding ID Version Rule ID IA Controls Severity
V-215112 UBTU-16-030040 SV-215112r610931_rule 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
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide 2020-12-09

Details

Check Text ( C-16311r285204_chk )
Verify the Uncomplicated Firewall is enabled on the system by running the following command:

# sudo systemctl is-enabled ufw

enabled

If the above command returns the status as "disabled", 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-16309r285205_fix)
Enable the Uncomplicated Firewall by using the following commands:

# sudo systemctl start ufw

# sudo systemctl enable ufw