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RE: JRun: The Easiness of Session Fixation
From: "Mitja Kolsek" <lists () acros si>
Date: Sat, 8 Mar 2003 18:34:37 +0100

Hi Christoph,

I'm sure you know this but as the author of the session fixation paper I'd
like to make things perfectly clear for everyone: The JRun functionality
that you mentioned is *NOT* a security problem by itself. There has to exist
a session fixation vulnerability in a web application to be exploited using
this functionality in the first place!
You're right that it makes fixing a session much easier but it's just an
unfortunate side effect. Again, if the web application is immune to session
fixation, your ability to set a session ID cookie becomes completely
irrelevant to security. Session fixation is a vulnerability of web
applications, not the web servers these apps are running on. Apologies to
everyone for repeating myself, but my paper seems to have caused a bit of
confusion among readers.

To answer one of your questions, you can make a call to session.invalidate()
for invalidating any current session the browser may be in. This will make
JRun issue a new JSESSIONID cookie.

Regards,

Mitja Kolsek
ACROS Security
http://www.acros.si


-----Original Message-----
From: Christoph Schnidrig [mailto:christoph.schnidrig () csnc ch]
Sent: Friday, February 28, 2003 3:36 PM
To: bugtraq () securityfocus com
Subject: JRun: The Easiness of Session Fixation


Hi all

The the Session-ID Fixation paper available from
http://www.acros.si/papers/session_fixation.pdf mentions that JRun
accepts abritrary Session-ID's and create new sessions with the proposed
Session-ID. This means that it is possible to send the following URL
http://foo/bar?jsessionid=foo123 and the JRun server will accept and use
the proposed Session-ID (foo123). Furthermore the server will set a
cookie in users browser with the proposed Session-ID! Using this
technique, it is much easier to exploit this kind of attack and to enter
in other's web application sessions.

Is anybody aware of a vendor patch or another workaround? Is it possible
to enforce the server to create a new Session-ID?


Thanks a lot

Christoph




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