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Guide to the Secure Configuration of Red Hat Enterprise Linux 8

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Verify firewalld Enabled

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

  • net.ipv6.conf.default.max_addresses

    Maximum number of autoconfigured IPv6 addresses
    Value
    Show

  • Rsyslog Logs Sent To Remote Host

    If system logs are to be useful in detecting malicious activities, it is necessary to send logs to a remote server. An intruder who has compromised...
    Group
    Show

  • Remote Log Server

    Specify an URI or IP address of a remote host where the log messages will be sent and stored.
    Value
    Show

  • Ensure Logs Sent To Remote Host

    To configure rsyslog to send logs to a remote log server, open <code>/etc/rsyslog.conf</code> and read and understand the last section of the file,...
    Rule Medium Severity
    Show

  • Configure TLS for rsyslog remote logging

    Configure <code>rsyslog</code> to use Transport Layer Security (TLS) support for logging to remote server for the Forwarding Output Module in <code...
    Rule Medium Severity
    Show

  • Configure CA certificate for rsyslog remote logging

    Configure CA certificate for <code>rsyslog</code> logging to remote server using Transport Layer Security (TLS) using correct path for the <code>De...
    Rule Medium Severity
    Show

  • Network Configuration and Firewalls

    Most systems must be connected to a network of some sort, and this brings with it the substantial risk of network attack. This section discusses th...
    Group
    Show

  • 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 Client Dynamic DNS Updates

    Dynamic DNS allows clients to dynamically update their own DNS records. The updates are transmitted by unencrypted means which can reveal informati...
    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

  • net.ipv6.conf.default.router_solicitations

    Accept all router solicitations by default?
    Value
    Show

  • daemons_use_tcp_wrapper SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

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