bugtraq - Re: Jetty Session ID Prediction

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Date: Tue, 6 Feb 2007 09:20:33 +0100 (CET)
From: Michal Zalewski <lcamtuf@...ne.ids.pl>
To: Amit Klein <aksecurity@...il.com>
Cc: NGSSoftware Insight Security Research <nisr@...software.com>,
	bugtraq@...urityfocus.com
Subject: Re: Jetty Session ID Prediction

On Tue, 6 Feb 2007, Amit Klein wrote:

> I don't think that the method described in the paper you referenced
> above is applicable as-is [...] (only 32 bits out of the 48 are known).

There are attacks published for just about any variant of LCG imaginable,
including ones with missing MSB/LSB output bits, etc. But I had a chance
to talk to David Litchfield and Chris Anley off the list, and they do use
an algorithmic approach, not brute force - that was simply a poor choice
of words.

/mz