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How does the unofficial patch work?

April 26, 2017patch unofficial

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How does the unofficial patch work?

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The wmfhotfix.dll is injected into any process loading user32.dll. The DLL then patches (in memory) gdi32.dll’s Escape() function so that it ignores any call using the SETABORTPROC (ie. 0x09) parameter. This should allow Windows programs to display WMF files normally while still blocking the exploit. The version of the patch located here has been carefully checked against the source code provided as well as tested against all known versions of the exploit. It should work on WinXP (SP1 and SP2) and Win2K.