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Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000363-GPOS-00150

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  • The Ubuntu operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner. The file integrity tool must notify the system administrator (SA) when changes to the baseline configuration or anomalies in the operation of any security functions are discovered.

    &lt;VulnDiscussion&gt;Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized ...
    Rule Medium Severity
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  • SRG-OS-000366-GPOS-00153

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  • The Ubuntu operating system's Advance Package Tool (APT) must be configured to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.

    &lt;VulnDiscussion&gt;Changes to any software components can have significant effects on the overall security of the operating system. This require...
    Rule Medium Severity
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  • SRG-OS-000368-GPOS-00154

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  • The Ubuntu operating system must be configured to use AppArmor.

    &lt;VulnDiscussion&gt;Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may pr...
    Rule Medium Severity
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  • SRG-OS-000380-GPOS-00165

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  • The Ubuntu operating system must allow the use of a temporary password for system logons with an immediate change to a permanent password.

    &lt;VulnDiscussion&gt;Without providing this capability, an account may be created without a password. Non-repudiation cannot be guaranteed once an...
    Rule Medium Severity
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  • SRG-OS-000383-GPOS-00166

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  • The Ubuntu operating system must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.

    &lt;VulnDiscussion&gt;If cached authentication information is out-of-date, the validity of the authentication information may be questionable.&lt;/...
    Rule Low Severity
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  • SRG-OS-000396-GPOS-00176

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  • The Ubuntu operating system must implement NIST FIPS-validated cryptography to protect classified information and for the following: To provision digital signatures, to generate cryptographic hashes, and to protect unclassified information requiring confidentiality and cryptographic protection in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating ...
    Rule High Severity
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  • SRG-OS-000403-GPOS-00182

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  • The Ubuntu operating system must use DoD PKI-established certificate authorities for verification of the establishment of protected sessions.

    &lt;VulnDiscussion&gt;Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that se...
    Rule Medium Severity
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  • SRG-OS-000404-GPOS-00183

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  • Ubuntu operating system must implement cryptographic mechanisms to prevent unauthorized modification of all information at rest.

    &lt;VulnDiscussion&gt;Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthor...
    Rule Medium Severity
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  • SRG-OS-000405-GPOS-00184

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  • Ubuntu operating system must implement cryptographic mechanisms to prevent unauthorized disclosure of all information at rest.

    &lt;VulnDiscussion&gt;Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthor...
    Rule Medium Severity
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  • SRG-OS-000420-GPOS-00186

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  • The Ubuntu operating system must configure the uncomplicated firewall to rate-limit impacted network interfaces.

    &lt;VulnDiscussion&gt;Denial of service (DoS) is a condition when a resource is not available for legitimate users. When this occurs, the organizat...
    Rule Medium Severity
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