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Guide to the Secure Configuration of Ubuntu 22.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Remote Log Server

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

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
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  • Strengthen the Default Ruleset

    The default rules can be strengthened. The system scripts that activate the firewall rules expect them to be defined in configuration files under t...
    Group
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  • IPSec Support

    Support for Internet Protocol Security (IPsec) is provided with Libreswan.
    Group
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  • iptables and ip6tables

    A host-based firewall called <code>netfilter</code> is included as part of the Linux kernel distributed with the system. It is activated by default...
    Group
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  • Install iptables-persistent Package

    The iptables-persistent package can be installed with the following command: 
    $ apt-get install iptables-persistent
    Rule Medium Severity
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  • Install iptables Package

    The iptables package can be installed with the following command: 
    $ apt-get install iptables
    Rule Medium Severity
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  • Remove iptables-persistent Package

    The iptables-persistent package can be removed with the following command: 
    $ apt-get remove iptables-persistent
    Rule Medium Severity
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  • Inspect and Activate Default Rules

    View the currently-enforced <code>iptables</code> rules by running the command: <pre>$ sudo iptables -nL --line-numbers</pre> The command is analog...
    Group
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  • Verify ip6tables Enabled if Using IPv6

    The ip6tables service can be enabled with the following command: 
    $ sudo systemctl enable ip6tables.service
    Rule Medium Severity
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  • Verify iptables Enabled

    The iptables service can be enabled with the following command: 
    $ sudo systemctl enable iptables.service
    Rule Medium Severity
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  • Set Default ip6tables Policy for Incoming Packets

    To set the default policy to DROP (instead of ACCEPT) for the built-in INPUT chain which processes incoming packets, add or correct the following l...
    Rule Medium Severity
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  • Set configuration for IPv6 loopback traffic

    Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network.
    Rule Medium Severity
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  • Kernel Parameters Which Affect Networking

    The <code>sysctl</code> utility is used to set parameters which affect the operation of the Linux kernel. Kernel parameters which affect networking...
    Group
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  • Set 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

  • Strengthen the Default Ruleset

    The default rules can be strengthened. The system scripts that activate the firewall rules expect them to be defined in the configuration files <co...
    Group
    Show

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