Credit is to "Nils Sommer of bytegeist, working with Google Project Zero".
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Tested on Win 7 32-bit with Special Pool enabled.
Multiple pool buffer overflows can be triggered through the NtGdiStretchBlt system call. The attached PoC demonstrates a write overflow and another read over flow issue which is likely to be usable for memory leaks (enabled by uncommenting the first NtGdiStretchBlt call).
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This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.
