We recently begun to search bugs in USB host stacks using one of our tool based on the Facedancer. This article first presents our fuzzing approach followed by a practical example of a bug in Windows 8.1 x64 full-updated. The goal of this article is not to redefine state-of-the-art USB fuzzing, nor to give a full description of our fuzzing architecture, but rather to narrate a scenario which starts from fuzzing and ends up with a bug report.
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