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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

  • net.ipv4.conf.all.log_martians

    Disable so you don't Log Spoofed Packets, Source Routed Packets, Redirect Packets
    Value
    Show

  • net.ipv4.conf.all.rp_filter

    Enable to enforce sanity checking, also called ingress filtering or egress filtering. The point is to drop a packet if the source and destination I...
    Value
    Show

  • net.ipv4.conf.all.secure_redirects

    Enable to prevent hijacking of routing path by only allowing redirects from gateways known in routing table. Disable to refuse acceptance of secure...
    Value
    Show

  • net.ipv4.conf.all.shared_media

    Controls whether the system can send (router) or accept (host) RFC1620 shared media redirects. <code>shared_media</code> for the interface will be ...
    Value
    Show

  • net.ipv4.conf.default.accept_redirects

    Disable ICMP Redirect Acceptance?
    Value
    Show

  • net.ipv4.conf.default.accept_source_route

    Disable IP source routing?
    Value
    Show

  • net.ipv4.conf.default.log_martians

    Disable so you don't Log Spoofed Packets, Source Routed Packets, Redirect Packets
    Value
    Show

  • net.ipv4.conf.default.rp_filter

    Enables source route verification
    Value
    Show

  • net.ipv4.conf.default.secure_redirects

    Enable to prevent hijacking of routing path by only allowing redirects from gateways known in routing table. Disable to refuse acceptance of secure...
    Value
    Show

  • net.ipv4.conf.default.shared_media

    Controls whether the system can send(router) or accept(host) RFC1620 shared media redirects. <code>shared_media</code> for the interface will be en...
    Value
    Show

  • net.ipv4.icmp_echo_ignore_broadcasts

    Ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast
    Value
    Show

  • net.ipv4.icmp_ignore_bogus_error_responses

    Enable to prevent unnecessary logging
    Value
    Show

  • net.ipv4.tcp_invalid_ratelimit

    Configure the maximal rate for sending duplicate acknowledgments in response to incoming invalid TCP packets.
    Value
    Show

  • net.ipv4.tcp_rfc1337

    Enable to enable TCP behavior conformant with RFC 1337
    Value
    Show

  • net.ipv4.tcp_syncookies

    Enable to turn on TCP SYN Cookie Protection
    Value
    Show

  • 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...
    Rule Medium Severity
    Show

  • 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

  • Configure ARP filtering for All IPv4 Interfaces

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

  • 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 n...
    Rule Medium Severity
    Show

  • 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
    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...
    Rule Medium Severity
    Show

  • cdrecord_read_content SELinux Boolean

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

  • 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...
    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

  • Configure Sending and Accepting Shared Media Redirects by Default

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

  • cluster_can_network_connect SELinux Boolean

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

  • 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
    Show

  • 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 ar...
    Rule Medium Severity
    Show

  • 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
    Show

  • 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
    Show

  • 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 Wireless Through Software Configuration

    If it is impossible to remove the wireless hardware from the device in question, disable as much of it as possible through software. The following ...
    Group
    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
    Show

  • 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
    Show

  • Nftables Base Chain Hooks

    The possible hooks which can be used to configure the base chain are: <code>ingress</code> (only in netdev family since Linux kernel 4.2, and inet ...
    Value
    Show

  • Nftables Chain Names

    The rules in nftables are attached to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter pack...
    Value
    Show

  • Nftables Base Chain Policies

    This is the default verdict that will be applied to packets reaching the end of the chain (i.e, no more rules to be evaluated against). Currently ...
    Value
    Show

  • Nftables Base Chain Priorities

    Each nftables base chain is assigned a priority that defines its ordering among other base chains, flowtables, and Netfilter internal operations a...
    Value
    Show

  • Nftables Base Chain Types

    Base chains are those that are registered into the Netfilter hooks, i.e. these chains see packets flowing through the Linux TCP/IP stack. The poss...
    Value
    Show

  • Nftables Families

    Netfilter enables filtering at multiple networking levels. With iptables there is a separate tool for each level: iptables, ip6tables, arptables, ...
    Value
    Show

  • Nftables Master configuration file

    The file which contains top level configuration for nftables service, and with which, the service is started.
    Value
    Show

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