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Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000023-GPOS-00006

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enable the graphical user logon banner to display the Standard Mandatory DoD Notice and Consent Banner before granting local access to the system via a graphical user logon.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy...
    Rule Medium Severity
    Show

  • SRG-OS-000023-GPOS-00006

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local access to the system via a graphical user logon.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy...
    Rule Medium Severity
    Show

  • SRG-OS-000028-GPOS-00009

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must retain a user's session lock until that user reestablishes access using established identification and authentication procedures.

    &lt;VulnDiscussion&gt;A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the ...
    Rule Medium Severity
    Show

  • SRG-OS-000030-GPOS-00011

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must allow users to directly initiate a session lock for all connection types.

    &lt;VulnDiscussion&gt;A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the ...
    Rule Medium Severity
    Show

  • SRG-OS-000068-GPOS-00036

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication.

    &lt;VulnDiscussion&gt;Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the indivi...
    Rule High Severity
    Show

  • SRG-OS-000075-GPOS-00043

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enforce 24 hours/1 day as the minimum password lifetime. Passwords for new users must have a 24 hours/1 day minimum password lifetime restriction.

    &lt;VulnDiscussion&gt;Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enfo...
    Rule Low Severity
    Show

  • SRG-OS-000076-GPOS-00044

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enforce a 60-day maximum password lifetime restriction. Passwords for new users must have a 60-day maximum password lifetime restriction.

    &lt;VulnDiscussion&gt;Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the ...
    Rule Low Severity
    Show

  • SRG-OS-000080-GPOS-00048

    <GroupDescription></GroupDescription>
    Group
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  • Ubuntu operating systems when booted must require authentication upon booting into single-user and maintenance modes.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule High Severity
    Show

  • SRG-OS-000104-GPOS-00051

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must uniquely identify interactive users.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule Medium Severity
    Show

  • SRG-OS-000134-GPOS-00068

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must ensure only users who need access to security functions are part of sudo group.

    &lt;VulnDiscussion&gt;An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform...
    Rule High Severity
    Show

  • SRG-OS-000279-GPOS-00109

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must automatically terminate a user session after inactivity timeouts have expired.

    &lt;VulnDiscussion&gt;Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of ...
    Rule Medium Severity
    Show

  • SRG-OS-000373-GPOS-00156

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must require users to reauthenticate for privilege escalation or when changing roles.

    &lt;VulnDiscussion&gt;Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When oper...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00228

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system default filesystem permissions must be defined in such a way that all authenticated users can read and modify only their own files.

    &lt;VulnDiscussion&gt;Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary acce...
    Rule Medium Severity
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  • SRG-OS-000105-GPOS-00052

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must implement smart card logins for multifactor authentication for local and network access to privileged and non-privileged accounts.

    &lt;VulnDiscussion&gt;Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased. Multifacto...
    Rule Medium Severity
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  • SRG-OS-000125-GPOS-00065

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must use strong authenticators in establishing nonlocal maintenance and diagnostic sessions.

    &lt;VulnDiscussion&gt;Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network,...
    Rule Medium Severity
    Show

  • SRG-OS-000126-GPOS-00066

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must immediately terminate all network connections associated with SSH traffic after a period of inactivity.

    &lt;VulnDiscussion&gt;Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of ...
    Rule Medium Severity
    Show

  • SRG-OS-000163-GPOS-00072

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must immediately terminate all network connections associated with SSH traffic at the end of the session or after 10 minutes of inactivity.

    &lt;VulnDiscussion&gt;Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take c...
    Rule Medium Severity
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  • SRG-OS-000228-GPOS-00088

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting any local or remote connection to the system.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the publicly accessible operating system en...
    Rule Medium Severity
    Show

  • SRG-OS-000423-GPOS-00187

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must use SSH to protect the confidentiality and integrity of transmitted information.

    &lt;VulnDiscussion&gt;Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected commu...
    Rule High Severity
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  • SRG-OS-000424-GPOS-00188

    <GroupDescription></GroupDescription>
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  • The Ubuntu operating system must configure the SSH daemon to use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hashes 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-000424-GPOS-00188

    <GroupDescription></GroupDescription>
    Group
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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
    Show

  • SRG-OS-000480-GPOS-00229

    <GroupDescription></GroupDescription>
    Group
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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>
    Group
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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

    <GroupDescription></GroupDescription>
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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
    Show

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