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Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

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

    <VulnDiscussion>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
    Show

  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
    Group
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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
    Show

  • SRG-OS-000069-GPOS-00037

    <GroupDescription></GroupDescription>
    Group
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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

  • SRG-OS-000070-GPOS-00038

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must enforce password complexity by requiring that at least one lower-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

  • SRG-OS-000071-GPOS-00039

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enforce password complexity by requiring that at least one numeric 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

  • SRG-OS-000072-GPOS-00040

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must require the change of at least 8 characters when passwords are changed.

    &lt;VulnDiscussion&gt; If the operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances o...
    Rule Low Severity
    Show

  • SRG-OS-000078-GPOS-00046

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enforce a minimum 15-character password length.

    &lt;VulnDiscussion&gt;The shorter the password, the lower the number of possible combinations that need to be tested before the password is comprom...
    Rule Medium Severity
    Show

  • SRG-OS-000266-GPOS-00101

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must enforce password complexity by requiring that at least one special 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 o...
    Rule Low Severity
    Show

  • SRG-OS-000480-GPOS-00225

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must prevent the use of dictionary words for passwords.

    &lt;VulnDiscussion&gt;If the Ubuntu operating system allows the user to select passwords based on dictionary words, then this increases the chances...
    Rule Medium Severity
    Show

  • SRG-OS-000480-GPOS-00225

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must be configured so that when passwords are changed or new passwords are established, pwquality must 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 Medium Severity
    Show

  • SRG-OS-000066-GPOS-00034

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system, for PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.

    &lt;VulnDiscussion&gt;Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate n...
    Rule Medium Severity
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  • SRG-OS-000375-GPOS-00160

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.

    &lt;VulnDiscussion&gt;Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the...
    Rule Medium Severity
    Show

  • SRG-OS-000376-GPOS-00161

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must accept Personal Identity Verification (PIV) credentials.

    &lt;VulnDiscussion&gt;The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. DoD has mandated the u...
    Rule Medium Severity
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  • SRG-OS-000377-GPOS-00162

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must electronically verify Personal Identity Verification (PIV) credentials.

    &lt;VulnDiscussion&gt;The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. DoD has mandated the u...
    Rule Medium Severity
    Show

  • The Ubuntu operating system for PKI-based authentication, must implement a local cache of revocation data in case of the inability to access revocation information via the network.

    &lt;VulnDiscussion&gt;Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer autho...
    Rule Medium Severity
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  • SRG-OS-000077-GPOS-00045

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must prohibit password reuse for a minimum of five generations.

    &lt;VulnDiscussion&gt;Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute...
    Rule Low Severity
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  • SRG-OS-000329-GPOS-00128

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts have been made.

    &lt;VulnDiscussion&gt;By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise...
    Rule Low Severity
    Show

  • SRG-OS-000446-GPOS-00200

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must be configured so that the script which runs each 30 days or less to check file integrity is the default one.

    &lt;VulnDiscussion&gt;Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00226

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.

    &lt;VulnDiscussion&gt;Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain acc...
    Rule Low Severity
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  • SRG-OS-000004-GPOS-00004

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must permit only authorized groups ownership of the audit log files.

    &lt;VulnDiscussion&gt;Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confide...
    Rule Medium Severity
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  • SRG-OS-000059-GPOS-00029

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000004-GPOS-00004

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/group.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000004-GPOS-00004

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000004-GPOS-00004

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/gshadow.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000004-GPOS-00004

    <GroupDescription></GroupDescription>
    Group
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  • The Ubuntu operating system must be configured so that the audit log directory is not write-accessible by unauthorized users.

    &lt;VulnDiscussion&gt;If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malic...
    Rule Medium Severity
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  • The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000046-GPOS-00022

    <GroupDescription></GroupDescription>
    Group
    Show

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