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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 Group Who Owns /etc/ipsec.secrets File

    To properly set the group owner of /etc/ipsec.secrets, run the command: 
    $ sudo chgrp root /etc/ipsec.secrets
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/ipsec.conf File

    To properly set the owner of /etc/ipsec.conf, run the command: 
    $ sudo chown root /etc/ipsec.conf
    Rule Medium Severity
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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. This firewall is controlled by the program <code...
    Group
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  • Remove iptables-services Package

    The iptables-services package can be removed with the following command: 
    $ sudo yum erase iptables-services
    Rule Medium Severity
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  • Verify Group Who Owns /etc/iptables Directory

    To properly set the group owner of /etc/iptables, run the command: 
    $ sudo chgrp root /etc/iptables
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/iptables Directory

    To properly set the owner of /etc/iptables, run the command: 
    $ sudo chown root /etc/iptables
    Rule Medium Severity
    Show

  • Verify Permissions On /etc/iptables Directory

    To properly set the permissions of /etc/iptables, run the command: 
    $ sudo chmod 0700 /etc/iptables
    Rule Medium Severity
    Show

  • 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 analogous for <code>ip6tables</code>. <br> ...
    Group
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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 the configuration files <code>iptables</code> and <code>ip6tables</code> in t...
    Group
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  • Set Default iptables Policy for Forwarded Packets

    To set the default policy to DROP (instead of ACCEPT) for the built-in FORWARD chain which processes packets that will be forwarded from one interface to another, add or correct the following line ...
    Rule Medium Severity
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  • Ensure IPv6 is disabled through kernel boot parameter

    To disable IPv6 protocol support in the Linux kernel, add the argument <code>ipv6.disable=1</code> to the default GRUB2 command line for the Linux operating system. To ensure that <code>ipv6.disabl...
    Rule Low Severity
    Show

  • Manually Assign IPv6 Router Address

    Edit the file <code>/etc/sysconfig/network-scripts/ifcfg-<i>interface</i> </code>, and add or correct the following line (substituting your gateway IP as appropriate): <pre>IPV6_D...
    Rule Unknown Severity
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  • Use Privacy Extensions for Address

    To introduce randomness into the automatic generation of IPv6 addresses, add or correct the following line in <code>/etc/sysconfig/network-scripts/ifcfg-<i>interface</i> </code>: ...
    Rule Unknown Severity
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  • Configure Accepting Prefix Information in Router Advertisements on All IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.all.accept_ra_pinfo</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv6.conf.all.accept_ra_pinfo=0</pre> To make ...
    Rule Unknown Severity
    Show

  • Configure Maximum Number of Autoconfigured Addresses on All IPv6 Interfaces

    To set the runtime status of the <code>net.ipv6.conf.all.max_addresses</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv6.conf.all.max_addresses=1</pre> To make sure...
    Rule Unknown Severity
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  • 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 sysctl -w net.ipv6.conf.default.accept_source_route=...
    Rule Medium Severity
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  • Configure Denying Router Solicitations on All IPv6 Interfaces By Default

    To set the runtime status of the <code>net.ipv6.conf.default.router_solicitations</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv6.conf.default.router_solicitation...
    Rule Unknown Severity
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  • Disable Accepting Packets Routed Between Local Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.accept_local</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.accept_local=0</pre> To make sure t...
    Rule Medium Severity
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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 net.ipv4.conf.all.accept_redirects=0</pre> To mak...
    Rule Medium Severity
    Show

  • Configure Response Mode of ARP Requests for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.arp_ignore</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.arp_ignore=<xccdf-1.2:sub idref="xccd...
    Rule Medium Severity
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  • Prevent Routing External Traffic to Local Loopback on All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.route_localnet</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.route_localnet=0</pre> To make su...
    Rule Medium 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.ipv4.conf.all.rp_filter=1</pre> To make sure that th...
    Rule Medium Severity
    Show

  • 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 net.ipv4.conf.all.secure_redirects=0</pre> To mak...
    Rule Medium Severity
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  • Configure Sending and Accepting Shared Media Redirects for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.shared_media</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.shared_media=<xccdf-1.2:sub idref="...
    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 sysctl -w net.ipv4.conf.default.accept_source_route=...
    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 -w net.ipv4.icmp_echo_ignore_broadcasts=1</pre> To...
    Rule Medium Severity
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  • Verify that Shared Library Directories Have Root Group Ownership

    System-wide shared library files, which are linked to executables during process load time or run time, are stored in the following directories by default: <pre>/lib /lib64 /usr/lib /usr/lib64 </pr...
    Rule Medium Severity
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  • Configure Kernel to Rate Limit Sending of Duplicate TCP Acknowledgments

    Make sure that the system is configured to limit the maximal rate for sending duplicate acknowledgments in response to incoming TCP packets that are for an existing connection but that are invalid ...
    Rule Medium Severity
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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 net.ipv4.conf.all.send_redirects=0</pre> To make su...
    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 -w net.ipv4.conf.default.send_redirects=0</pre> To...
    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 guidance in this section.</code><br><br> nftables is a su...
    Group
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  • Install nftables Package

    nftables provides a new in-kernel packet classification framework that is based on a network-specific Virtual Machine (VM) and a new nft userspace command line tool. nftables reuses the existing Ne...
    Rule Medium Severity
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  • Verify Group Who Owns /etc/nftables Directory

    To properly set the group owner of /etc/nftables, run the command: 
    $ sudo chgrp root /etc/nftables
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/nftables Directory

    To properly set the owner of /etc/nftables, run the command: 
    $ sudo chown root /etc/nftables
    Rule Medium Severity
    Show

  • Verify Permissions On /etc/nftables Directory

    To properly set the permissions of /etc/nftables, run the command: 
    $ sudo chmod 0700 /etc/nftables
    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 families. Red Hat Enterprise Linux 8 uses <code>firewa...
    Rule Medium Severity
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  • Disable DCCP Support

    The Datagram Congestion Control Protocol (DCCP) is a relatively new transport layer protocol, designed to support streaming media and telephony. To configure the system to prevent the <code>dccp</...
    Rule Medium Severity
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  • Disable SCTP Support

    The Stream Control Transmission Protocol (SCTP) is a transport layer protocol, designed to support the idea of message-oriented communication, with several streams of messages within one connection...
    Rule Medium Severity
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  • Wireless Networking

    Wireless networking, such as 802.11 (WiFi) and Bluetooth, can present a security risk to sensitive or classified systems and networks. Wireless networking hardware is much more likely to be include...
    Group
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  • Disable Kernel iwlmvm Module

    To configure the system to prevent the <code>iwlmvm</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/iwlmvm.conf</code>: <pre>install iwlmvm /bin/fa...
    Rule Medium Severity
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  • Deactivate Wireless Network Interfaces

    Deactivating wireless network interfaces should prevent normal usage of the wireless capability. <br> <br> Configure the system to disable all wireless network interfaces with th...
    Rule Medium Severity
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  • Verify that system commands directories have root as a group owner

    System commands are stored in the following directories: by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> All these directories should have <code>root</code...
    Rule Medium Severity
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  • Verify Group Who Owns /etc/selinux Directory

    To properly set the group owner of /etc/selinux, run the command: 
    $ sudo chgrp root /etc/selinux
    Rule Medium Severity
    Show

  • Verify that system commands directories have root ownership

    System commands are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> All these directories should be owned by the <code>...
    Rule Medium Severity
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  • Verify Group Who Owns /etc/crypttab File

    To properly set the group owner of /etc/crypttab, run the command: 
    $ sudo chgrp root /etc/crypttab
    Rule Medium Severity
    Show

  • Verify Group Who Owns System.map Files

    The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and their corresponding memory addresses. These files...
    Rule Low Severity
    Show

  • Verify User Who Owns /etc/crypttab File

    To properly set the owner of /etc/crypttab, run the command: 
    $ sudo chown root /etc/crypttab
    Rule Medium Severity
    Show

  • Verify User Who Owns System.map Files

    The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and their corresponding memory addresses. These files...
    Rule Low Severity
    Show

  • Verify Permissions on /etc/audit/auditd.conf

    To properly set the permissions of /etc/audit/auditd.conf, run the command: 
    $ sudo chmod 0640 /etc/audit/auditd.conf
    Rule Medium Severity
    Show

  • Verify Permissions on /etc/audit/rules.d/*.rules

    To properly set the permissions of /etc/audit/rules.d/*.rules, run the command: 
    $ sudo chmod 0640 /etc/audit/rules.d/*.rules
    Rule Medium Severity
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