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Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000424-GPOS-00188

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system must configure the SSH daemon to use FIPS 140-2 approved ciphers to prevent the unauthorized disclosure of information and/or detect changes to information during transmission.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote a...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00229

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system must not allow unattended or automatic login via SSH.

    &lt;VulnDiscussion&gt;Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security.&lt;/VulnDiscuss...
    Rule High Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system must be configured so that remote X connections are disabled, unless to fulfill documented and validated mission requirements.

    &lt;VulnDiscussion&gt;The security risk of using X11 forwarding is that the client's X11 display server may be exposed to attack when the SSH clien...
    Rule High Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system SSH daemon must prevent remote hosts from connecting to the proxy display.

    &lt;VulnDiscussion&gt;When X11 forwarding is enabled, there may be additional exposure to the server and client displays if the sshd proxy display ...
    Rule Medium Severity
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  • SRG-OS-000069-GPOS-00037

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  • The Ubuntu operating system must enforce password complexity by requiring that at least one upper-case character be used.

    &lt;VulnDiscussion&gt;Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...
    Rule Low Severity
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