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Guide to the Secure Configuration of Red Hat Enterprise Linux 8

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Configure Multiple DNS Servers in /etc/resolv.conf

    Determine whether the system is using local or DNS name resolution with the following command: <pre>$ sudo grep hosts /etc/nsswitch.conf hosts: fi...
    Rule Medium Severity
    Show

  • Disable Zeroconf Networking

    Zeroconf networking allows the system to assign itself an IP address and engage in IP communication without a statically-assigned address or even a...
    Rule Unknown Severity
    Show

  • Prevent non-Privileged Users from Modifying Network Interfaces using nmcli

    By default, non-privileged users are given permissions to modify networking interfaces and configurations using the <code>nmcli</code> command. Non...
    Rule Medium Severity
    Show

  • Ensure System is Not Acting as a Network Sniffer

    The system should not be acting as a network sniffer, which can capture all traffic on the network to which it is connected. Run the following to d...
    Rule Medium Severity
    Show

  • firewalld

    The dynamic firewall daemon <code>firewalld</code> provides a dynamically managed firewall with support for network “zones” to assign a level of tr...
    Group
    Show

  • Configure Firewalld to Use the Nftables Backend

    Firewalld can be configured with many backends, such as nftables.
    Rule Medium Severity
    Show

  • Ensure network interfaces are assigned to appropriate zone

    Firewall zones define the trust level of network connections or interfaces. Note: Changing firewall settings while connected over network can resul...
    Rule Medium Severity
    Show

  • Inspect and Activate Default firewalld Rules

    Firewalls can be used to separate networks into different zones based on the level of trust the user has decided to place on the devices and traffi...
    Group
    Show

  • Install firewalld Package

    The firewalld package can be installed with the following command: 
    $ sudo yum install firewalld
    Rule Medium Severity
    Show

  • Verify firewalld Enabled

    The firewalld service can be enabled with the following command: 
    $ sudo systemctl enable firewalld.service
    Rule Medium Severity
    Show

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