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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Set nftables Configuration for Loopback Traffic

    Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network.
    Rule Medium Severity
    Show

  • Ensure a Table Exists for Nftables

    Tables in nftables hold chains. Each table only has one address family and only applies to packets of this family. Tables can have one of six famil...
    Rule Medium Severity
    Show

  • SuSEfirewall2

    The SuSEfirewall2 provides a managed firewall.
    Group
    Show

  • Uncomplicated Firewall (ufw)

    The Linux kernel in Ubuntu provides a packet filtering system called netfilter, and the traditional interface for manipulating netfilter are the ip...
    Group
    Show

  • Install ufw Package

    The ufw package can be installed with the following command: 
    $ apt-get install ufw
    Rule Medium Severity
    Show

  • Ensure ufw Default Deny Firewall Policy

    A default deny policy on connections ensures that any unconfigured network usage will be rejected. Note: Any port or protocol without a explicit a...
    Rule Medium Severity
    Show

  • Set UFW Loopback Traffic

    Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network.
    Rule Medium Severity
    Show

  • Only Allow Authorized Network Services in ufw

    Check the firewall configuration for any unnecessary or prohibited functions, ports, protocols, and/or services by running the following command: <...
    Rule Medium Severity
    Show

  • ufw Must rate-limit network interfaces

    The operating system must configure the uncomplicated firewall to rate-limit impacted network interfaces.
    Rule Medium Severity
    Show

  • Ensure ufw Firewall Rules Exist for All Open Ports

    Any ports that have been opened on non-loopback addresses need firewall rules to govern traffic.
    Rule Medium Severity
    Show

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