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POErratic Invalid Viewstate issue in a .NET application
 

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    <p>I seem to be getting a "invalid viewstate" every now and then in the event viewer for my <a href="http://en.wikipedia.org/wiki/ASP.NET" rel="noreferrer">ASP.NET</a> application.</p> <p>Most of them (95%) seem to be referencing <code>ScriptResource.axd</code> (the application uses the <a href="http://en.wikipedia.org/wiki/ASP.NET_AJAX" rel="noreferrer">ASP.NET AJAX</a> library). There is no way I can remove the <a href="http://en.wikipedia.org/wiki/Ajax_%28programming%29" rel="noreferrer">Ajax</a> library either as Ajax is used everywhere..</p> <p>How can I reduce these errors? I'm getting ~ 100-200 errors a day and I have no idea how to fix them! They come from different browsers, different IPs and geographical locations.</p> <p>It's difficult for me to reproduce the problem because it barely even happened to me, it has only happened to me 3-4 times out of the blue.</p> <p><strong>Error:</strong></p> <pre><code>Process information: Process ID: 4004 Process name: w3wp.exe Account name: NT AUTHORITY\NETWORK SERVICE Exception information: Exception type: HttpException Exception message: Invalid viewstate. Request information: Request URL: http://domainnamehere/ScriptResource.axd?d=W1R6x9VzZ2C9SKnIkOmX9VRLhSjJ3nOF1GSQvPwKS3html Request path: /ScriptResource.axd User host address: 124.177.170.75 User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\NETWORK SERVICE Thread information: Thread ID: 1 Thread account name: NT AUTHORITY\NETWORK SERVICE Is impersonating: False Stack trace: at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at System.Web.UI.Page.DecryptString(String s) at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString) at System.Web.Handlers.ScriptResourceHandler.ProcessRequestInternal(HttpResponse response, NameValueCollection queryString, VirtualFileReader fileReader) at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context) at System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) Custom event details: For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. </code></pre> <p>I also get this error every now and then in my .NET code which happens at the same time which might be related:</p> <pre><code>Exception raised in GLOBAL.ASAX.Application_Error(): 'Padding is invalid and cannot be removed.' at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]&amp; outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast) at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) </code></pre>
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    1. COI may be seeing crocodiles in your tea cup, but it may be a classic padding oracle attack executing against your web site. Before anything else, its always safe to encrypt whatever sensitive data in your web.config file before its too late.
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