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VMware vSphere 7.0 ESXi Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must verify the DCUI.Access list.

    &lt;VulnDiscussion&gt;Lockdown mode disables direct host access, requiring that administrators manage hosts from vCenter Server. However, if a host...
    Rule Medium Severity
    Show

  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must verify the exception users list for lockdown mode.

    &lt;VulnDiscussion&gt;While a host is in lockdown mode (strict or normal), only users on the "Exception Users" list are allowed access. These users...
    Rule Medium Severity
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  • SRG-OS-000032-VMM-000130

    <GroupDescription></GroupDescription>
    Group
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  • Remote logging for ESXi hosts must be configured.

    &lt;VulnDiscussion&gt;Remote logging to a central log host provides a secure, centralized store for ESXi logs. By gathering host log files onto a c...
    Rule Medium Severity
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  • SRG-OS-000021-VMM-000050

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must enforce the limit of three consecutive invalid logon attempts by a user.

    &lt;VulnDiscussion&gt;By limiting the number of failed logon attempts, the risk of unauthorized access via user password guessing, otherwise known ...
    Rule Medium Severity
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  • SRG-OS-000329-VMM-001180

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must enforce an unlock timeout of 15 minutes after a user account is locked out.

    &lt;VulnDiscussion&gt;By enforcing a reasonable unlock timeout after multiple failed logon attempts, the risk of unauthorized access via user passw...
    Rule Medium Severity
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  • SRG-OS-000023-VMM-000060

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must display the Standard Mandatory DOD Notice and Consent Banner before granting access to the system via the Direct Console User Interface (DCUI).

    &lt;VulnDiscussion&gt;Failure to display the DOD logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized ac...
    Rule Medium Severity
    Show

  • SRG-OS-000023-VMM-000060

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host must display the Standard Mandatory DOD Notice and Consent Banner before granting access to the system via Secure Shell (SSH).

    &lt;VulnDiscussion&gt;Failure to display the DOD logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized ac...
    Rule Medium Severity
    Show

  • SRG-OS-000023-VMM-000060

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host SSH daemon must be configured with the DOD logon banner.

    &lt;VulnDiscussion&gt;The warning message reinforces policy awareness during the logon process and facilitates possible legal action against attack...
    Rule Medium Severity
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  • SRG-OS-000033-VMM-000140

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must use FIPS 140-2 validated cryptographic modules to protect the confidentiality of remote access sessions.

    &lt;VulnDiscussion&gt;OpenSSH on the ESXi host ships with a FIPS 140-2 validated cryptographic module that is enabled by default. For backward comp...
    Rule Medium Severity
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  • SRG-OS-000107-VMM-000530

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must ignore ".rhosts" files.

    &lt;VulnDiscussion&gt;SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. SSH can emulate...
    Rule Medium Severity
    Show

  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must not allow host-based authentication.

    &lt;VulnDiscussion&gt;SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. SSH's cryptogra...
    Rule Medium Severity
    Show

  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must not allow authentication using an empty password.

    &lt;VulnDiscussion&gt;Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, ...
    Rule Low Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must not permit user environment settings.

    &lt;VulnDiscussion&gt;SSH environment options potentially allow users to bypass access restriction in some configurations. Users must not be able t...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must perform strict mode checking of home directory configuration files.

    &lt;VulnDiscussion&gt;If other users have access to modify user-specific SSH configuration files, they may be able to log on the system as another ...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must not allow compression or must only allow compression after successful authentication.

    &lt;VulnDiscussion&gt;If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could res...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must be configured to not allow gateway ports.

    &lt;VulnDiscussion&gt;SSH Transmission Control Protocol (TCP) connection forwarding provides a mechanism to establish TCP connections proxied by th...
    Rule Low Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must be configured to not allow X11 forwarding.

    &lt;VulnDiscussion&gt;X11 forwarding over SSH allows for the secure remote execution of X11-based applications. This feature can increase the attac...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must not permit tunnels.

    &lt;VulnDiscussion&gt;OpenSSH has the ability to create network tunnels (layer 2 and layer 3) over an SSH connection. This function can provide sim...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must set a timeout count on idle sessions.

    &lt;VulnDiscussion&gt;Setting a timeout ensures that a user login will be terminated as soon as the "ClientAliveCountMax" is reached.&lt;/VulnDiscu...
    Rule Low Severity
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  • SRG-OS-000480-VMM-002000

    <GroupDescription></GroupDescription>
    Group
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  • The ESXi host Secure Shell (SSH) daemon must set a timeout interval on idle sessions.

    &lt;VulnDiscussion&gt;Automatically logging out idle users guards against compromises via hijacked administrative sessions.&lt;/VulnDiscussion&gt;&...
    Rule Low Severity
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  • SRG-OS-000037-VMM-000150

    <GroupDescription></GroupDescription>
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  • The ESXi host must produce audit records containing information to establish what type of events occurred.

    &lt;VulnDiscussion&gt;Without establishing what types of events occurred, it would be difficult to establish, correlate, and investigate the events...
    Rule Medium Severity
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  • SRG-OS-000069-VMM-000360

    <GroupDescription></GroupDescription>
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  • The ESXi host must be configured with a sufficiently complex password policy.

    &lt;VulnDiscussion&gt;To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of comple...
    Rule Medium Severity
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  • SRG-OS-000077-VMM-000440

    <GroupDescription></GroupDescription>
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  • The ESXi host must prohibit the reuse of passwords within five iterations.

    &lt;VulnDiscussion&gt;If a user or root used the same password continuously or was allowed to change it back shortly after being forced to change i...
    Rule Medium Severity
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  • SRG-OS-000095-VMM-000480

    <GroupDescription></GroupDescription>
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  • The ESXi host must disable the Managed Object Browser (MOB).

    &lt;VulnDiscussion&gt;The MOB provides a way to explore the object model used by the VMkernel to manage the host and enables configurations to be c...
    Rule Medium Severity
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  • SRG-OS-000095-VMM-000480

    <GroupDescription></GroupDescription>
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  • The ESXi host must be configured to disable nonessential capabilities by disabling Secure Shell (SSH).

    &lt;VulnDiscussion&gt;The ESXi Shell is an interactive command line interface (CLI) available at the ESXi server console. The ESXi shell provides t...
    Rule Medium Severity
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