RE: ISSUE 19: Requirements and Usage Scenarios document

David,
Wouldn't it be simpler to just say "no new attack vectors" rather than
attempt to find wording that says "aren't already similar..."? If it's a
new attack vector, I don't think it matters whether it is similar to
something that already exists.

Jon




                                                                           
             "David Orchard"                                               
             <dorchard@bea.com                                             
             >                                                          To 
             Sent by:                  "Anne van Kesteren"                 
             public-appformats         <annevk@opera.com>, Jon             
             -request@w3.org           Ferraiolo/Menlo Park/IBM@IBMUS      
                                                                        cc 
                                       "WAF WG (public)"                   
             01/15/2008 08:44          <public-appformats@w3.org>          
             AM                                                    Subject 
                                       RE: ISSUE 19: Requirements and      
                                       Usage Scenarios document            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           





Anne,

If Cookies would be sent as part of more requests because of deployment
of the Access Control spec, then isn't this spec opening a new attack
vector?  I understand your point that cookies are already sent under
img, script and form, but this is something newer and in addition to
those.  I think one of the rough requirements we have is no new attack
vectors.  Now maybe that requirement ought to be something like "no new
attack vectors that aren't already similar to current attack vectors
such as cookies under img, script and form".

Cheers,
Dave

> -----Original Message-----
> From: public-appformats-request@w3.org
> [mailto:public-appformats-request@w3.org] On Behalf Of Anne
> van Kesteren
> Sent: Tuesday, January 15, 2008 7:53 AM
> To: Jon Ferraiolo
> Cc: WAF WG (public)
> Subject: Re: ISSUE 19: Requirements and Usage Scenarios document
>
>
> On Tue, 15 Jan 2008 15:20:46 +0100, Jon Ferraiolo <jferrai@us.ibm.com>
> wrote:
> > I described a CSRF scenario in
> >
> http://lists.w3.org/Archives/Public/public-appformats/2008Jan/
0072.html.
> > Search for the word "attack". My example attack vector depends on
> > cookies being sent as part of the cross-site request and
> assumes that
> > the simplicity of using Access Control would result is widespread
> > adoption by a new generation of unsophisticated web service
> developers
> > who will open up their APIs to mashup applications without
> > understanding the consequences.
> > Note that the big CSRF worry here is that cookies are sent with the
> > requests.
>
> Cookies are already sent for <img>, <script>, and <form>
> requests. Nothing new. If people mindless opt in we have
> might have a problem (though it's really the people that opt
> in that do), but I would expect that dalmationlovers.invalid
> & co are using some off the shelf software.
>
>
> --
> Anne van Kesteren
> <http://annevankesteren.nl/>
> <http://www.opera.com/>
>
>