ESXI-67-000064 - For the ESXi host, all port groups must not be configured to VLAN 4095 unless Virtual Guest Tagging (VGT) is required - VGT is required.

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Information

When a port group is set to VLAN 4095, this activates VGT mode. In this mode, the vSwitch passes all network frames to the guest VM without modifying the VLAN tags, leaving it up to the guest to deal with them. VLAN 4095 should be used only if the guest has been specifically configured to manage VLAN tags itself. If VGT is enabled inappropriately, it might cause denial of service or allow a guest VM to interact with traffic on an unauthorized VLAN.

Solution

From the vSphere Client, select the ESXi host and go to Configure >> Networking >> Virtual switches.

Highlight a port group where VLAN ID is set to 4095 and click Edit settings (dots).

Change the VLAN ID to an appropriate VLAN and click 'OK'.

or

From a PowerCLI command prompt while connected to the ESXi host, run the following command:

Get-VirtualPortGroup -Name 'portgroup name' | Set-VirtualPortGroup -VLanId 'New VLAN#'

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_6-7_Y22M10_STIG.zip

Item Details

References: CAT|II, CCI|CCI-000366, Rule-ID|SV-239318r674883_rule, STIG-ID|ESXI-67-000064, Vuln-ID|V-239318

Plugin: VMware

Control ID: c6383e7e6d0dbf1682077553df4746c50ac7caf0551fb21ee42ecc783d3c6758