Date: Wed, 22 Aug 2012 14:31:07 +0400 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: argyros.george@...il.com, Aggelos Kiayias <aggelos@...yias.com> Subject: Re: Randomness Attacks Against PHP Applications Hi, 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 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: http://blog.ptsecurity.com/2012/08/not-so-random-numbers-take-two.html 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. Alexander
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