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Guide to the Secure Configuration of Red Hat Enterprise Linux CoreOS 4

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Verify ip6tables Enabled if Using IPv6

    The <code>ip6tables</code> service can be enabled with the following manifest: <pre> --- apiVersion: machineconfiguration.openshift.io/v1 kind: Ma...
    Rule Medium Severity
    Show

  • Verify iptables Enabled

    The <code>iptables</code> service can be enabled with the following manifest: <pre> --- apiVersion: machineconfiguration.openshift.io/v1 kind: Mac...
    Rule Medium Severity
    Show

  • 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
    Show

  • Disable IPv6 Networking Support Automatic Loading

    To prevent the IPv6 kernel module (<code>ipv6</code>) from binding to the IPv6 networking stack, add the following line to <code>/etc/modprobe.d/di...
    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

  • Set Default iptables 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
    Show

  • 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 interf...
    Rule Medium Severity
    Show

  • Restrict ICMP Message Types

    In <code>/etc/sysconfig/iptables</code>, the accepted ICMP messages types can be restricted. To accept only ICMP echo reply, destination unreachabl...
    Group
    Show

  • Log and Drop Packets with Suspicious Source Addresses

    Packets with non-routable source addresses should be rejected, as they may indicate spoofing. Because the modified policy will reject non-matching ...
    Group
    Show

  • 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...
    Group
    Show

  • Disable Support for IPv6 Unless Needed

    Despite configuration that suggests support for IPv6 has been disabled, link-local IPv6 address auto-configuration occurs even when only an IPv4 ad...
    Group
    Show

  • 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 ...
    Rule Low Severity
    Show

  • Disable IPv6 Addressing on All IPv6 Interfaces

    To disable support for (<code>ipv6</code>) addressing on all interface add the following line to <code>/etc/sysctl.d/ipv6.conf</code> (or another f...
    Rule Medium Severity
    Show

  • Disable IPv6 Addressing on IPv6 Interfaces by Default

    To disable support for (<code>ipv6</code>) addressing on interfaces by default add the following line to <code>/etc/sysctl.d/ipv6.conf</code> (or a...
    Rule Medium Severity
    Show

  • 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
    Show

  • IPV6_AUTOCONF

    Toggle global IPv6 auto-configuration (only, if global forwarding is disabled)
    Value
    Show

  • net.ipv6.conf.all.accept_ra_defrtr

    Accept default router in router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_ra_pinfo

    Accept prefix information in router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_ra_rtr_pref

    Accept router preference in router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_ra

    Accept all router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_redirects

    Toggle ICMP Redirect Acceptance
    Value
    Show

  • net.ipv6.conf.all.accept_source_route

    Trackers could be using source-routed packets to generate traffic that seems to be intra-net, but actually was created outside and has been redirec...
    Value
    Show

  • net.ipv6.conf.all.autoconf

    Enable auto configuration on IPv6 interfaces
    Value
    Show

  • net.ipv6.conf.all.forwarding

    Toggle IPv6 Forwarding
    Value
    Show

  • net.ipv6.conf.all.max_addresses

    Maximum number of autoconfigured IPv6 addresses
    Value
    Show

  • net.ipv6.conf.all.router_solicitations

    Accept all router solicitations?
    Value
    Show

  • net.ipv6.conf.default.accept_ra_defrtr

    Accept default router in router advertisements?
    Value
    Show

  • net.ipv6.conf.default.accept_ra_pinfo

    Accept prefix information in router advertisements?
    Value
    Show

  • net.ipv6.conf.default.accept_ra_rtr_pref

    Accept router preference in router advertisements?
    Value
    Show

  • net.ipv6.conf.default.accept_ra

    Accept default router advertisements by default?
    Value
    Show

  • net.ipv6.conf.default.accept_redirects

    Toggle ICMP Redirect Acceptance By Default
    Value
    Show

  • net.ipv6.conf.default.accept_source_route

    Trackers could be using source-routed packets to generate traffic that seems to be intra-net, but actually was created outside and has been redirec...
    Value
    Show

  • net.ipv6.conf.default.autoconf

    Enable auto configuration on IPv6 interfaces
    Value
    Show

  • net.ipv6.conf.default.forwarding

    Toggle IPv6 default Forwarding
    Value
    Show

  • net.ipv6.conf.default.max_addresses

    Maximum number of autoconfigured IPv6 addresses
    Value
    Show

  • net.ipv6.conf.default.router_solicitations

    Accept all router solicitations by default?
    Value
    Show

  • net.ipv4.conf.all.accept_redirects

    Disable ICMP Redirect Acceptance
    Value
    Show

  • net.ipv4.conf.all.accept_source_route

    Trackers could be using source-routed packets to generate traffic that seems to be intra-net, but actually was created outside and has been redirec...
    Value
    Show

  • 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
    Show

  • 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
    Show

  • Limit Network-Transmitted Configuration if Using Static IPv6 Addresses

    To limit the configuration information requested from other systems and accepted from the network on a system that uses statically-configured IPv6 ...
    Group
    Show

  • 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
    Show

  • 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
    Show

  • net.ipv4.conf.default.arp_filter

    Controls whether the ARP filter is enabled or not. 1 - Allows you to have multiple network interfaces on the same subnet, and have the ARPs for ea...
    Value
    Show

  • net.ipv4.conf.default.arp_ignore

    Control the response modes for ARP queries that resolve local target IP addresses: 0 - (default): reply for any local target IP address, configure...
    Value
    Show

  • net.ipv4.conf.all.forwarding

    Toggle IPv4 Forwarding
    Value
    Show

Node 2

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