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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Network Configuration and Firewalls
Uncomplicated Firewall (ufw)
Ensure ufw Firewall Rules Exist for All Open Ports
Ensure ufw Firewall Rules Exist for All Open Ports
An XCCDF Rule
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Ensure ufw Firewall Rules Exist for All Open Ports
Medium Severity
Any ports that have been opened on non-loopback addresses need firewall rules to govern traffic.