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Windows Reversing Technique Articles


Item name: Subverting Windows7 x64 kernel with DMA attacks
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Author: Christophe Devine, Damien Aumaitre                        
Home URL: https://bob.cat/
Last updated: July 4, 2010
Version (if appl.):
Direct D/L link: http://conference.hitb.org/hitbsecconf2010ams/materials/D2T2%20-%20Devine%20&%20Aumaitre%20-%20Subverting%20Windows%207%20x64%20Kernel%20with%20DMA%20Attacks.pdf
Description: This presentation will focus on concrete examples of compromising the Windows 7 x64 operating system, in effect bypassing two major security mecanisms: code signing and integrity verification (PatchGuard).

First, we’ll explain the internal structures of the operating system, and how they differ from previous versions. Then we describe how to alter these structures in order to gain control over the execution flow. The implementation of this attack is then presented, using an embedded soft-core MIPS CPU implemented on an FPGA PCMCIA/CardBus card.

Finally, we will conclude on the importance of new protection features included in recent CPUs, in particular the IOMMU and TXT.
Also listed in: Windows Internals Articles
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