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[Positive Research] Intel SMEP overview and partial bypass on Windows 8 (whitepaper)



Intel SMEP overview and partial bypass on Windows 8 (whitepaper).

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It is natural to conclude that if you can?t store your shellcode in the user-mode, you have to find a way to store it somewhere in the kernel space. The most obvious solution is using windows objects such as WinAPI (Events, Timers, Sections etc) or GDI (Brushes, DCs etc). They are accessed indirectly from the user-mode via WinAPI that uses system calls. The point is that the object body is kept in the kernel and somehow some object fields can be modified from the user-mode, so an attacker can transfer the needed shellcode bytes from the user-mode memory to the kernel-mode.
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-----[ Full details ]
---[ Blog

http://blog.ptsecurity.com/2012/09/intel-smep-overview-and-partial-bypass.html

---[ Whitepapers

English version (PDF):
http://www.ptsecurity.com/download/SMEP_overview_and_partial_bypass_on_Windows_8.pdf

Russian version (PDF):
http://www.ptsecurity.ru/download/Technology_Overview_Intel_SMEP_and_partial_bypass_on_Windows_8.pdf

Thx!

---------------------------------
AShishkin[at]ptsecurity[dot]ru

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