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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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.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

  • 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

  • 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.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

Node 2

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The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.

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