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The Power of ViewState in ASP.NET

, 7 Sep 2012 CPOL
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How to prevent one-click attacks.


One of my client servers was attacked by an 'One-Click Attack'. Do you know what an one-click attack is? I don’t want to annoy you with a long description of it, so I will make it short! An one-click attack is when a hacker creates HTML that includes a form and a link which, when clicked, submits the form to the server being attacked. The hacker use it to then spam the target site.


In one-click attacks they use third parties. Like emails with content that looks familiar like: "click here to claim your prize". You can set the ViewStateUserKey property on your pages and it will be stored in ViewState. If the page is postback, the runtime checks the ViewState to make sure it’s equal to the current ViewStateUserKey.

Here is an example of a code that can solve your problem:

protected void Page_Init(object sender, EventArgs e)
  this.ViewStateUserKey = Request.UserHostAddress;

And now attackers can’t copy your hidden field and use it in an one-click attack!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

taha bahrami
Web Developer
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
Taha has started programming at the age of 16 and he has taken an avid interest in Microsoft technologies. He professionally works on ASP.NET and C#. Mainly, He lives for getting the world into codes and follows this aspiration in a third world country with lack of facility and support. He never gives up seeking success and competence.
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Comments and Discussions

QuestionNice Article Pinmemberkkankala7-Sep-12 6:16 
AnswerRe: Nice Article Pinmembertaha bahrami8-Sep-12 10:21 

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