Title

An application firewall must be installed. (Cat II impact)

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

Additional Identifiers

Rule ID: SV-215111r610931_rule

Vulnerability ID: V-215111

Group Title: SRG-OS-000297-GPOS-00115

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.