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Re: [http-state] Security considerations overview

Achim Hoffmann <ah@securenet.de> Thu, 04 March 2010 08:55 UTC

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Date: Thu, 04 Mar 2010 09:55:45 +0100
From: Achim Hoffmann <ah@securenet.de>
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To: Mark Pauley <mpauley@apple.com>
References: <5c4444771003021103s422a65c3me96af57dfee58105@mail.gmail.com> <Pine.LNX.4.64.1003021139330.4097@egate.xpasc.com> <5c4444771003021205t78c18f73t78913ae6ff3c70b1@mail.gmail.com> <Pine.LNX.4.64.1003021337130.21569@egate.xpasc.com> <5c4444771003021354o70faccache31b8a0d28005aeb@mail.gmail.com> <5691356f1003021438t1487d6d0g39439a2bdc3543ce@mail.gmail.com> <5c4444771003021452g44538236ta855abcfe6d578da@mail.gmail.com> <Pine.LNX.4.64.1003021508100.21569@egate.xpasc.com> <5c4444771003021539i2ed4ea44mf6b52970bc52385b@mail.gmail.com> <D88C1747-4C28-43DB-9BBD-5EB951CCD471@apple.com> <5691356f1003021640n22c2dc49j7939a2f4d19d1868@mail.gmail.com> <58FE8180-6A66-44B2-90AB-33F6FFE79779@apple.com> <B9FD2591-8A5A-46CA-A1E7-323868B23CF1@apple.com>
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Cc: http-state <http-state@ietf.org>
Subject: Re: [http-state] Security considerations overview
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Mark Pauley wrote on 04.03.2010 00:38:
> It would appear that this is covered by 4.1.2.2
> 
> We (and many other browsers) do allow setting a cookie with domain .bar.example.com from .foo.example.com
> 
> Indeed, some web applications rely on this behavior.  The compromise is that we'll allow .foo.example.com to set a cookie for .bar.example.com if and only if .example.com is not a Top Level (or registry controlled) Domain.

outch.
That's exactly why 7. Security Consideration writes:

   Cookie protocol is NOT RECOMMENDED for (new) applications.

(my personal opinion for *secure* applications would be: FORBIDDEN ;-)
Achim

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