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Guide to the Secure Configuration of Ubuntu 20.04

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  • Configure Security Tools to Improve System Robustness

    Several tools exist which can be effectively used to improve a system's resistance to and detection of unknown attacks. These tools can improve rob...
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  • How to Use This Guide

    Readers should heed the following points when using the guide.
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  • Formatting Conventions

    Commands intended for shell execution, as well as configuration file text, are featured in a <code>monospace font</code>. <i>Italics</i> are used t...
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  • Read Sections Completely and in Order

    Each section may build on information and recommendations discussed in prior sections. Each section should be read and understood completely; instr...
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  • Reboot Required

    A system reboot is implicitly required after some actions in order to complete the reconfiguration of the system. In many cases, the changes will n...
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  • Root Shell Environment Assumed

    Most of the actions listed in this document are written with the assumption that they will be executed by the root user running the <code>/bin/bash...
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  • Test in Non-Production Environment

    This guidance should always be tested in a non-production environment before deployment. This test environment should simulate the setup in which t...
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  • Disable SSH Support for User Known Hosts

    SSH can allow system users to connect to systems if a cache of the remote systems public keys is available. This should be disabled. <br><br> To e...
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  • Verify Permissions on group File

    To properly set the permissions of /etc/group, run the command: 
    $ sudo chmod 0644 /etc/group
    Rule Medium Severity
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  • Restrict Access to Kernel Message Buffer

    To set the runtime status of the <code>kernel.dmesg_restrict</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.dmesg...
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