An application firewall must be installed.

From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide

Associated with: CCI-002314

SV-90483r2_rule An application firewall must be installed.

Vulnerability discussion

Uncomplicated Firewall provides a easy and effective way to block/limit remote access to the system, via ports, services and protocols.Remote access services, such as those providing remote access to network devices and information systems, which lack automated control capabilities, increase risk and make remote user access management difficult at best.Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.Ubuntu operating system functionality (e.g., RDP) must be capable of taking enforcement action if the audit reveals unauthorized activity. Automated control of remote access sessions allows organizations to ensure ongoing compliance with remote access policies by enforcing connection rules of remote access applications on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets).

Check content

Verify that the Uncomplicated Firewall is installed. Check that the Uncomplicated Firewall is installed with the following command: # sudo apt list ufw ii ufw 0.35-0Ubuntu2 [installed] If the "ufw" package 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

Install Uncomplicated Firewall with the following command: # sudo apt-get install ufw

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