Source: https://code.google.com/p/google-security-research/issues/detail?id=544

The attached PoC triggers a null pointer vulnerability in OffsetChildren on Windows 7 32-bit. By mapping the null page an attacker can leverage this vulnerability to write to an arbitrary address.
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Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/bin-sploits/39025.zip