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Guide to the Secure Configuration of Amazon Linux 2023

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Kernel Parameters Which Affect Networking

    The sysctl utility is used to set parameters which affect the operation of the Linux kernel. Kernel parameters which affect networking and have security implications are described here.
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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 certain types of IPv4 protocol attacks.
    Group
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  • net.ipv4.conf.all.accept_redirects

    Disable ICMP Redirect Acceptance
    Value
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  • 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 redirected.
    Value
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  • net.ipv4.conf.all.log_martians

    Disable so you don't Log Spoofed Packets, Source Routed Packets, Redirect Packets
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  • 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 IP addresses in the IP header do not make sense whe...
    Value
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  • 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 ICMP redirected packets on all interfaces.
    Value
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  • net.ipv4.conf.default.accept_redirects

    Disable ICMP Redirect Acceptance?
    Value
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  • net.ipv4.conf.default.accept_source_route

    Disable IP source routing?
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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
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  • 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 -w net.ipv4.conf.all.accept_source_route=0</pre> ...
    Rule Medium Severity
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  • 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.ipv4.conf.all.log_martians=1</pre> To make sure t...
    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.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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  • 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 sysctl -w net.ipv4.conf.default.accept_redirects=0</pre...
    Rule Medium Severity
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  • 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
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  • 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 net.ipv4.conf.default.log_martians=1</pre> To mak...
    Rule Unknown Severity
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  • 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 net.ipv4.conf.default.rp_filter=1</pre> To make sure...
    Rule Medium Severity
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  • 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 sysctl -w net.ipv4.conf.default.secure_redirects=0</pre...
    Rule Medium Severity
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  • 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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