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

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Date: Thu, 23 Feb 2012 01:45:43 +0530
From: David Blanc <davidblanc1975@...il.com>
To: Michele Orru <antisnatchor@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Pros and cons of
	'Access-Control-Allow-Origin' header?

I am sorry, I don't understand what you are trying to say here. Which
question of mine did you answer?

BTW, I'm aware that whether we use a wildcard or not is up to us.

On Thu, Feb 23, 2012 at 1:28 AM, Michele Orru <antisnatchor@...il.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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
Hosted and sponsored by Secunia - http://secunia.com/