full-disclosure - Re: Multiple Cookies combined to a single Set-Cookie response

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Date: Fri, 20 Mar 2009 10:00:10 +0100
From: Michal Zalewski <lcamtuf@...edump.cx>
To: Phani <pklanka@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Multiple Cookies combined to a single
	Set-Cookie response

> Could anyone put in any thoughts on this...

That's a weird question for full-disclosure@ - but yeah, your
observations are correct - see the intro text and first bullet here:

http://code.google.com/p/browsersec/wiki/Part2#Same-origin_policy_for_cookies

In general, cookie support is a mess to an extent higher than many
other mechanisms.

There is an original, half-baked draft from Netscape that reflects
bulk of current cookie behavior most accurately; RFC 2109, which
attempted to sort it out, but is widely disregarded on most counts,
though with some exceptions; and RFC 2965, flat out ignored by most
browsers. Every browser has an implementation based on their best
reading of these three documents, but each implementation is unique.
Multiple cookies per Set-Cookie, cookie ordering, quoted-string
handling, and host-scoped cookie behavior are the most important
differences (all of which have some security consequences, by the
way).

/mz

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