BugTraq
RE: ASP.NET __VIEWSTATE crypto validation prone to replay attacks May 03 2005 04:58PM
Tim Farley (tfarley spidynamics com)
Microsoft has addressed your issues 1-a, 1-b and 1-c by adding a property "ViewStateUserKey" to the System.Web.UI.Page class in .NET Framework 1.1. The documentation for this property is here:

http://msdn.microsoft.com/library/en-us/cpref/html/frlrfsystemwebuipagec
lassviewstateuserkeytopic.asp

Of course, it is up to the individual web page developer to ensure an appropriate non-trivial value has been placed into this property. As we all know, this is exactly the sort of detail that developers often forget or flub, with disastrous results.

--Tim Farley
SPI Dynamics

Start Secure. Stay Secure.
Security Assurance Throughout the Application Lifecycle.

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