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Date: Wed, 22 Aug 2012 14:31:07 +0400
From: Solar Designer <>
Cc:, Aggelos Kiayias <>
Subject: Re: Randomness Attacks Against PHP Applications


On Thu, Aug 09, 2012 at 11:19:14AM -0700, Yves-Alexis Perez wrote:
> I'm currently at the Usenix Security 2012 conference, where there was a
> nice paper about randomness vulnerabilities in PHP applications. I
> invite you to read the paper[1] but in summary, a lot of PHP
> applications make false assumption about the true randomness of the core
> PHP random functions and it might lead to attacks, for example using the
> ???password reset??? features.
> Paper authors tried to port this to PHP security team, but it seems the
> answer was that it was an application problem.

Here's a vulnerability in and attack on session IDs of PHP proper:

This is not exactly the same topic (PHP apps vs. PHP itself), yet it's
closely related and the timing of it was provoked by the same research.


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