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Date: Thu, 5 May 2005 23:17:10 +0200
From: Michal Zalewski <>
Subject: Re: ASP.NET __VIEWSTATE crypto validation prone to replay attacks

I would also like to point all concerned to an excellent post about
replay attacks on __VIEWSTATE; the post is by Scott Mitchell, the guy
who authored the MSDN article I initially referred to [1]:

His article is aimed at developers; Scott explains the issue I
reported in a way that makes it perhaps more clear why putting user
ID, session ID, or other similar data in __VIEWSTATE is not a remedy
by itself, and why reposting __VIEWSTATE is dangerous despite target
script location checks.



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