Source: https://code.google.com/p/google-security-research/issues/detail?id=415

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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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Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38280.zip