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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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?

-----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?
> 
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iQEcBAEBAgAGBQJPRUjKAAoJEBgl8Z+oSxe4Gn8H+wTu5HqCgm5md7jZOghFV0c0
TSgTakNd05x60raj1wNeCXjqE2mqHDvECjJIezlzlDgAx3q2TpagUlzR2iIICc6Y
25N9CCIkvb6WPqBl3Ee/NYkXPgKb6GDNGzdzNGZtrzZZrvOP3Dy6MCvw6RxwjcWo
DtAzvHd4tAktRMfOpE61ICwyXOl5dCER4a/ai3DolN7O5xJvv0SsB3qgBF+4++pJ
XhuQC9WA3j9994k9n9x4NGqJBZUE7vvfTIZR3T85BgcY8YiJgOHTmarMF7Fb6kHB
mSLEVLWE1bY3aMKN7+SPjnkS7LZeCoMnhmXEQ2jcWCPUBQpv/hzjq6hgduOSoes=
=xNpJ
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/