Windows 7 and newer systems include the ability to manually mount VHD files. Eventually, Microsoft Hyper-V adopted this disk image format. The VHD (Virtual Hard Disk) file format, originally introduced with Connectix Virtual PC, can store the contents of a hard disk drive. In this post, I describe some of the risks associated with these two file types. In particular, I focused on VHD and VHDX files on Windows systems. (The slides from my presentation are available in the SEI Digital Library.) Although my primary goal was to find bugs in kernel file-system-parsing code, a notable part of my research was investigating attack vectors. Recently, I gave a presentation at BSidesPGH 2019 called Death By Thumb Drive: File System Fuzzing with CERT BFF.
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