On Mon, 19 Jan 2004, Dave McKinney wrote:

> This does appear to be a known way of tracking web users without using
> cookies: http://sourcefrog.net/projects/meantime/

Yup, my apologies for this sort-of-false alert. The only excuse I can
offer is that I failed to find any related information during a routine
run of Google queries, and that the flaw is still very much alive
nowadays.

The problem is ineed known, both the use of ETags and Last-Modified
headers to store data, and the indirect variant I described later on. The
issue had been initially reported by Martin Pool here:

http://cert.uni-stuttgart.de/archive/bugtraq/2000/03/msg00365.html

Cheers,
--
------------------------- bash$ :(){ :|:&};: --
Michal Zalewski * [http://lcamtuf.coredump.cx]
Did you know that clones never use mirrors?
--------------------------- 2004-01-20 01:57 --
http://lcamtuf.coredump.cx/photo/current/

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