Cookies are not a threat to 'todays web applications'.
It is how they are implemented, and what the function of what they are
implemented by is (e.g. online banking), and what it has (e.g.
forums).
If I steal your cookies
via the forums (assuming PATH is / and they are both on X.com), I have
your bank account. Naturally, it doesn't work that way - just an
example.
You must properly sanatise input, that's all. Cookies are in no way insecure.
On 4/29/06, Brian Eaton <eaton.lists@gmail.com> wrote:
On 4/29/06, Achim Hoffmann <kirke11@securenet.de> wrote:
> Well, my post is a bit off-topic to the initial subject, but the question
> and my other question "sequence of cookies in a request" show again that
> cookies are a fundametal threat in todays web applications.
> I claim too "There is no path security".
> (cookie2 with encrypted values are a different story, however ...)
I just went and looked up your old note in the archives
(http://www.webappsec.org/lists/websecurity/archive/2005-11/msg00097.html).
I didn't see any responses there. One important thing about the
order in which cookies are sent (that you didn't mention in your
original note) is that they are sent with the most restrictive path
first. For example, if there are two cookies with the same name, one
with a path of /one, and the other with a path of /one/two, the
/one/two cookie is sent before the /one cookie.
I'm not entirely in agreement with your statement, "cookies are a
fundamental threat in todays web applications." There is simply not a
viable replacement for the functionality they provide. When misguided
folks suggest that a web application not use cookies for security
reasons, web developers just turn around and use hidden form fields.
Hidden form fields and cookies are exactly the same from a security
perspective. It's just one is more difficult to implement.
If a developer is going to spend time worrying about cookies, I'd
rather they worried about something useful like whether they are using
a proper random number generator for their session IDs.
I'm just not seeing the fundamental threat from cookies that you
describe. Would you explain a little more fully what you mean?
Regards,
Brian
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