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CCN Red Hat Enterprise Linux 9 - Intermediate

Rules and Groups employed by this XCCDF Profile

  • Set Boot Loader Password in grub2

    The grub2 boot loader should have a superuser account and password protection enabled to protect boot-time settings. <br><br> Since plaintext passw...
    Rule High 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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  • Verify firewalld Enabled

    The firewalld service can be enabled with the following command: 
    $ sudo systemctl enable firewalld.service
    Rule Medium Severity
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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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  • Configure Firewalld to Restrict Loopback Traffic

    Configure <code>firewalld</code> to restrict loopback traffic to the <code>lo</code> interface. The loopback traffic must be trusted by assigning ...
    Rule Medium Severity
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  • Configure Firewalld to Trust Loopback Traffic

    Assign loopback interface to the <code>firewalld</code> <code>trusted</code> zone in order to explicitly allow the loopback traffic in the system. ...
    Rule Medium Severity
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  • Set Default firewalld Zone for Incoming Packets

    To set the default zone to <code>drop</code> for the built-in default zone which processes incoming IPv4 and IPv6 packets, modify the following lin...
    Rule Medium Severity
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  • IPv6

    The system includes support for Internet Protocol version 6. A major and often-mentioned improvement over IPv4 is its enormous increase in the numb...
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  • Configure IPv6 Settings if Necessary

    A major feature of IPv6 is the extent to which systems implementing it can automatically configure their networking devices using information from ...
    Group
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  • Configure Accepting Router Advertisements on All IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.all.accept_ra</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ip...
    Rule Medium Severity
    Show

  • Disable Accepting ICMP Redirects for All IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.all.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w...
    Rule Medium Severity
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  • Disable Kernel Parameter for Accepting Source-Routed Packets on all IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.all.accept_source_route</code> kernel parameter, run the following command: <pre>$ sudo sysctl...
    Rule Medium Severity
    Show

  • Disable Accepting Router Advertisements on all IPv6 Interfaces by Default

    To set the runtime status of the <code>net.ipv6.conf.default.accept_ra</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w ne...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting ICMP Redirects by Default on IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.default.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysct...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting Source-Routed Packets on IPv6 Interfaces by Default

    To set the runtime status of the <code>net.ipv6.conf.default.accept_source_route</code> kernel parameter, run the following command: <pre>$ sudo sy...
    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...
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  • Network Related Kernel Runtime Parameters for Hosts and Routers

    Certain kernel parameters should be set for systems which are acting as either hosts or routers to improve the system's ability defend against cert...
    Group
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  • Disable Accepting ICMP Redirects for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting Source-Routed Packets on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.accept_source_route</code> kernel parameter, run the following command: <pre>$ sudo sysctl...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Log Martian Packets on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.log_martians</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net...
    Rule Unknown Severity
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  • Enable Kernel Parameter to Use Reverse Path Filtering on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.rp_filter</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ip...
    Rule Medium Severity
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  • Disable Kernel Parameter for Accepting Secure ICMP Redirects on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.secure_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting ICMP Redirects by Default on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.default.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysct...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting Source-Routed Packets on IPv4 Interfaces by Default

    To set the runtime status of the <code>net.ipv4.conf.default.accept_source_route</code> kernel parameter, run the following command: <pre>$ sudo sy...
    Rule Medium Severity
    Show

  • Enable Kernel Paremeter to Log Martian Packets on all IPv4 Interfaces by Default

    To set the runtime status of the <code>net.ipv4.conf.default.log_martians</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w...
    Rule Unknown Severity
    Show

  • Enable Kernel Parameter to Use Reverse Path Filtering on all IPv4 Interfaces by Default

    To set the runtime status of the <code>net.ipv4.conf.default.rp_filter</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w ne...
    Rule Medium Severity
    Show

  • Configure Kernel Parameter for Accepting Secure Redirects By Default

    To set the runtime status of the <code>net.ipv4.conf.default.secure_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysct...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Ignore ICMP Broadcast Echo Requests on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.icmp_echo_ignore_broadcasts</code> kernel parameter, run the following command: <pre>$ sudo sysctl ...
    Rule Medium Severity
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  • Enable Kernel Parameter to Ignore Bogus ICMP Error Responses on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.icmp_ignore_bogus_error_responses</code> kernel parameter, run the following command: <pre>$ sudo s...
    Rule Unknown Severity
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  • Enable Kernel Parameter to Use TCP Syncookies on Network Interfaces

    To set the runtime status of the <code>net.ipv4.tcp_syncookies</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.t...
    Rule Medium Severity
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  • Network Parameters for Hosts Only

    If the system is not going to be used as a router, then setting certain kernel parameters ensure that the host will not perform routing of network ...
    Group
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  • Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w n...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces by Default

    To set the runtime status of the <code>net.ipv4.conf.default.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl ...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for IP Forwarding on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.ip_forward</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.ip_fo...
    Rule Medium Severity
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  • nftables

    <code>If firewalld or iptables are being used in your environment, please follow the guidance in their respective section and pass-over the guidanc...
    Group
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  • Verify nftables Service is Disabled

    nftables is a subsystem of the Linux kernel providing filtering and classification of network packets/datagrams/frames and is the successor to ipta...
    Rule Medium Severity
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  • File Permissions and Masks

    Traditional Unix security relies heavily on file and directory permissions to prevent unauthorized users from reading or modifying files to which t...
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  • Restrict Dynamic Mounting and Unmounting of Filesystems

    Linux includes a number of facilities for the automated addition and removal of filesystems on a running system. These facilities may be necessary...
    Group
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  • Disable Mounting of squashfs

    To configure the system to prevent the <code>squashfs</code> kernel module from being loaded, add the following line to the file <code>/etc/modpro...
    Rule Low Severity
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  • Disable Mounting of udf

    To configure the system to prevent the <code>udf</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/...
    Rule Low Severity
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  • Disable Modprobe Loading of USB Storage Driver

    To prevent USB storage devices from being used, configure the kernel module loading system to prevent automatic loading of the USB storage driver. ...
    Rule Medium Severity
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  • Restrict Programs from Dangerous Execution Patterns

    The recommendations in this section are designed to ensure that the system's features to protect against potentially dangerous program execution ar...
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  • Disable Core Dumps

    A core dump file is the memory image of an executable program when it was terminated by the operating system due to errant behavior. In most cases,...
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  • Disable Core Dumps for SUID programs

    To set the runtime status of the <code>fs.suid_dumpable</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.suid_dumpable=...
    Rule Medium Severity
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  • SELinux

    SELinux is a feature of the Linux kernel which can be used to guard against misconfigured or compromised programs. SELinux enforces the idea that p...
    Group
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  • Install libselinux Package

    The libselinux package can be installed with the following command: 
    $ sudo dnf install libselinux
    Rule High Severity
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  • Ensure SELinux Not Disabled in /etc/default/grub

    SELinux can be disabled at boot time by an argument in <code>/etc/default/grub</code>. Remove any instances of <code>selinux=0</code> from the kern...
    Rule Medium Severity
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  • Configure SELinux Policy

    The SELinux <code>targeted</code> policy is appropriate for general-purpose desktops and servers, as well as systems in many other roles. To config...
    Rule Medium Severity
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