Title

A firewall must be installed on TOSS. (Cat II impact)

Discussion

"Firewalld" provides an 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. TOSS functionality (e.g., SSH) 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 "firewalld" is installed and active with the following commands: $ sudo yum list installed firewalld firewalld.noarch 0.9.3-7.el8 $ sudo systemctl is-active firewalld active If the "firewalld" package is not installed and "active", ask the System Administrator if another firewall is installed. If no firewall is installed and active this is a finding.

Fix Text

Install "firewalld" and enable with the following commands: $ sudo yum install firewalld.noarch $ sudo systemctl enable firewalld

Additional Identifiers

Rule ID: SV-253088r958672_rule

Vulnerability ID: V-253088

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.