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III - Administrative Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000095-VMM-000480

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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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  • SRG-OS-000095-VMM-000480

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  • The ESXi host must be configured to disable nonessential capabilities by disabling the ESXi shell.

    &lt;VulnDiscussion&gt;The ESXi Shell is an interactive command line environment available locally from the Direct Console User Interface (DCUI) or ...
    Rule Medium Severity
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  • SRG-OS-000163-VMM-000700

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  • The ESXi host must automatically stop shell services after 10 minutes.

    &lt;VulnDiscussion&gt;When the ESXi Shell or Secure Shell (SSH) services are enabled on a host, they will run indefinitely. To avoid having these s...
    Rule Medium Severity
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  • SRG-OS-000163-VMM-000700

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  • The ESXi host must set a timeout to automatically end idle DCUI sessions after 10 minutes.

    &lt;VulnDiscussion&gt;When the Direct Console User Interface (DCUI) is enabled and logged in, it should be automatically logged out if left logged ...
    Rule Medium Severity
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  • SRG-OS-000423-VMM-001700

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  • The ESXi host must protect the confidentiality and integrity of transmitted information by isolating ESXi management traffic.

    &lt;VulnDiscussion&gt;The vSphere management network provides access to the vSphere management interface on each component. Services running on the...
    Rule Medium Severity
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  • SRG-OS-000423-VMM-001700

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  • The ESXi host must protect the confidentiality and integrity of transmitted information by isolating IP-based storage traffic.

    &lt;VulnDiscussion&gt;Virtual machines (VMs) might share virtual switches and VLANs with the IP-based storage configurations. IP-based storage incl...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host lockdown mode exception users list must be verified.

    &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-000480-VMM-002000

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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
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  • SRG-OS-000480-VMM-002000

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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

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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

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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

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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

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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-000480-VMM-002000

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  • The ESXi host must disable Simple Network Management Protocol (SNMP) v1 and v2c.

    &lt;VulnDiscussion&gt;If SNMP is not being used, it must remain disabled. If it is being used, the proper trap destination must be configured. If S...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must disable Inter-Virtual Machine (VM) Transparent Page Sharing.

    &lt;VulnDiscussion&gt;Published academic papers have demonstrated that by forcing a flush and reload of cache memory, it is possible to measure mem...
    Rule Low Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must configure the firewall to block network traffic by default.

    &lt;VulnDiscussion&gt;In addition to service-specific firewall rules, ESXi has a default firewall rule policy to allow or deny incoming and outgoin...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must enable Bridge Protocol Data Units (BPDU) filter on the host to prevent being locked out of physical switch ports with Portfast and BPDU Guard enabled.

    &lt;VulnDiscussion&gt;BPDU Guard and Portfast are commonly enabled on the physical switch to which the ESXi host is directly connected to reduce th...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must configure virtual switch security policies to reject forged transmits.

    &lt;VulnDiscussion&gt;If the virtual machine (VM) operating system changes the Media Access Control (MAC) address, the operating system can send fr...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must configure virtual switch security policies to reject Media Access Control (MAC) address changes.

    &lt;VulnDiscussion&gt;If the virtual machine (VM) operating system changes the MAC address, it can send frames with an impersonated source MAC addr...
    Rule High Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must configure virtual switch security policies to reject promiscuous mode requests.

    &lt;VulnDiscussion&gt;When promiscuous mode is enabled for a virtual switch, all virtual machines (VMs) connected to the Portgroup have the potenti...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must restrict use of the dvFilter network application programming interface (API).

    &lt;VulnDiscussion&gt;If the organization is not using products that use the dvFilter network API, the host should not be configured to send networ...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must restrict the use of Virtual Guest Tagging (VGT) on standard switches.

    &lt;VulnDiscussion&gt;When a port group is set to VLAN 4095, the vSwitch passes all network frames to the attached virtual machines (VMs) without m...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must have all security patches and updates installed.

    &lt;VulnDiscussion&gt;Installing software updates is a fundamental mitigation against the exploitation of publicly known vulnerabilities.&lt;/VulnD...
    Rule High Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must not suppress warnings that the local or remote shell sessions are enabled.

    &lt;VulnDiscussion&gt;Warnings that local or remote shell sessions are enabled alert administrators to activity they may not be aware of and need t...
    Rule Medium Severity
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  • SRG-OS-000480-VMM-002000

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  • The ESXi host must not suppress warnings about unmitigated hyperthreading vulnerabilities.

    &lt;VulnDiscussion&gt;The L1 Terminal Fault (L1TF) CPU vulnerabilities published in 2018 have patches and mitigations available in vSphere. However...
    Rule Medium Severity
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