Virtual Hard Disk (.vhd file) contents may be accessed by all users after you mount the file as a loopback device in Windows Server 2008

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Article ID: 954358 - View products that this article applies to.
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Consider the following scenario. You mount a Virtual Machine hard disk file (.vhd file) as a loopback device in Windows Server 2008. The .vhd file is now available as a virtual hard disk. In this scenario, users may access the virtual machine, and they can read from or write to the virtual hard disk.


This issue occurs if you mount a .vhd file as loopback device by using the Hyper-V Windows Management Instrumentation (WMI) APIs.


To enforce the security of the contents of a .vhd file that is mounted as a loopback device, use one of the following methods:
  • Configure NTFS file system permissions on files and folders in the mounted .vhd file.
  • Use a separate server to which virtual machine users do not have access.


For more information about Hyper-V, visit the following Microsoft Web site:


Article ID: 954358 - Last Review: June 23, 2008 - Revision: 2.0
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
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