bugtraq - Re: Jetty Session ID Prediction

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Message-ID: <Pine.LNX.4.58.0702052037400.30846@dione>
Date: Mon, 5 Feb 2007 20:42:14 +0100 (CET)
From: Michal Zalewski <lcamtuf@...ne.ids.pl>
To: NGSSoftware Insight Security Research <nisr@...software.com>
Cc: bugtraq@...urityfocus.com
Subject: Re: Jetty Session ID Prediction

On Mon, 5 Feb 2007, NGSSoftware Insight Security Research wrote:

> Jetty generates a 64-bit session id by generating two 32-bit numbers in
> this way, so we end up with an encoded 64-bit integer. By decoding the
> integer and splitting it into its two component 32-bit integers, we can
> easily brute-force the generator's internal state.

Why on earth would you want to brute-force it?

http://www.springerlink.com/content/9jkp3179mj6fwh6m/s
http://dsns.csie.nctu.edu.tw/research/crypto/HTML/PDF/C89/138.PDF

Cheers,
/mz