oss-security - Predictable Math.random() in browsers

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Date: Tue, 09 Jun 2009 13:11:35 +0200
From: Florian Weimer <fw@...eb.enyo.de>
To: oss-security@...ts.openwall.com
Subject: Predictable Math.random() in browsers

<http://www.trusteer.com/temporary-user-tracking-in-major-browsers>
describes what essentially is a weakness in Math.random()---it's
predictable and its state is shared across domains.

Contrary to the report, I'm more worried about the general
consequences of weak random numbers.  Browsers should probably use a
stronger PRNG which doesn't leak its state, so that the shared state
doesn't matter.

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