full-disclosure - Re: Pros and cons of 'Access-Control-Allow-Origin' header?

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Message-ID: <4F4548CA.90709@gmail.com>
Date: Wed, 22 Feb 2012 20:58:02 +0100
From: Michele Orru <antisnatchor@...il.com>
To: David Blanc <davidblanc1975@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Pros and cons of
 'Access-Control-Allow-Origin' header?

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Take a look at http://beefproject.com internals.

We're using that header.

Actually it depends how do you use it.
It's like crossdomain.xml: you can use a wildcard or not,
it's up to you.

Cheers
antisnatchor

David Blanc wrote:
> Does 'Access-Control-Allow-Origin' header provide any benefits in
> defending against cross site scripting attacks?
> 
> Doesn't 'Access-Control-Allow-Origin' header make any XSS flaw
> trivially exploitable? For example, if an attacker finds an XSS flaw
> in a web application, he can now inject a JavaScript with
> XMLHttpRequest that sends a request to attacker's web server which
> serves resources with the HTTP header "Access-Control-Allow-Origin:
> *". The browser would see this header and fetch the resource from the
> attacker's web server.
> 
> Isn't the web a safer place without this header?
> 
> _______________________________________________
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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