bugtraq - Writeup by Amit Klein (Trusteer): "Google Chrome 3.0 (Beta) Math.random vulnerability"

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Message-ID: <4A9BB342.6020905@trusteer.com>
Date: Mon, 31 Aug 2009 14:25:54 +0300
From: Amit Klein <amit.klein@...steer.com>
To: bugtraq@...urityfocus.com
Subject: Writeup by Amit Klein (Trusteer): "Google Chrome 3.0 (Beta) Math.random
 vulnerability"

Hi list

I would like to announce a new writeup, titled
"Google Chrome 3.0 (Beta) Math.random vulnerability".
The writeup is available in the following URL:

http://www.trusteer.com/files/Google_Chrome_3.0_Beta_Math.random_vulnerability.pdf

Abstract:
The revised Google Chrome Math.random algorithm (included in version
3.0 of Google Chrome) is predictable. This paper describes how Google
Chrome 3.0 Math.random's internal state can be reconstructed, and how
it can be rolled forward and backward, and how (in Windows) the exact
seeding time can be extracted. This in turn leads to various attacks
(e.g. "in-session phishing") as described in an earlier paper 
(http://www.trusteer.com/files/Temporary_User_Tracking_in_Major_Browsers.pdf).

Thanks,
-Amit

Amit Klein, CTO, Trusteer