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Unauthorized serial devices must be disconnected on the virtual machine.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239342 VMCH-67-000011 SV-239342r679575_rule Medium
Description
Ensure that no device is connected to a virtual machine if it is not required. For example, floppy, serial and parallel ports are rarely used for virtual machines in a datacenter environment, and CD/DVD drives are usually connected only temporarily during software installation.
STIG Date
VMware vSphere 6.7 Virtual Machine Security Technical Implementation Guide 2022-01-04

Details

Check Text ( C-42575r679573_chk )
From the vSphere Web Client right-click the Virtual Machine and go to Edit Settings. Review the VMs hardware and verify no serial devices exist.

or

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

Get-VM | Where {$_.ExtensionData.Config.Hardware.Device.DeviceInfo.Label -match "serial"}

If a virtual machine has a serial device present, this is a finding.
Fix Text (F-42534r679574_fix)
The VM must be powered off in order to remove a serial device.

From the vSphere Web Client right-click the Virtual Machine and go to Edit Settings. Select the serial device and click the circle-x to remove then OK.