Re: Cookies

[Crispin Cowan <crispin () WIREX COM>]

George wrote:

> A few friends of mine were discussing the possibility of a custom crafted
> cookie replacing a valid cookie on a client machine being used to exploit
> the web server that placed the first cookie on the client.
>
> Has anyone looked at the possibility of editing a cookie to search
> for/exploit buffer overflows in the server side code that reads cookies? If
> there is any information on this sort of technique I would appreciate a
> pointer.

This sounds like an interesting variation on the "cross-site scripting" issue
announced early this year here http://www.cert.org/advisories/CA-2000-02.html
and here http://www.apache.org/info/css-security/index.html .  In both cases,
you're pretending to be "bigbiz.com" but actually sending data to
"badguyz.net".

Crispin

--
Crispin Cowan, Chief Scientist, WireX Communications, Inc. http://wirex.com
Free Hardened Linux Distribution:                          http://immunix.org