Summary
ASP.NET MVC 3 includes a new change in the the Account Controller to prevent open redirection attacks. After explaining how open redirection attacks work, I'll This tutorial explains how you can prevent open redirection attacks in your ASP.NET MVC applications. This tutorial discusses the changes that have been made in the AccountController in ASP.NET MVC 3 and demonstrates how you can apply these changes in your existing ASP.NET MVC 1.0 and 2 applications. What is an Open Redirection Attack?
Any web application that redirects to a URL that is specified via the request such as the querystring or form data can potentially be tampered with to redirect users to an external, malicious URL. This tampering is called an open redirection attack. Whenever your application logic redirects to a specified URL, you must verify that the redirection URL hasn’t been tampered with. The login used in the default AccountController for both ASP.NET MVC 1.0 and ASP.NET MVC 2 is vulnerable to open redirection attacks. Fortunately, it is easy to update your existing applications to use the corrections from the ASP.NET MVC 3 Preview. To understand the vulnerability, let’s look at how the login redirection works in a default ASP.NET MVC 2 Web Application project. In this application, attempting to visit a controller action that has the [Authorize] attribute will redirect unauthorized users to the /Account/LogOn view. This redirect to /Account/LogOn will include a returnUrl querystring parameter so that the user can be returned to the originally requested URL after they have successfully logged in. In the screenshot below, we can see that an attempt to access the /Account/ChangePassword view when not logged in results in a redirect to /Account/LogOn?ReturnUrl=%2fAccount%2fChangePassword%2f.Read more: Jon Galloway
ASP.NET MVC 3 includes a new change in the the Account Controller to prevent open redirection attacks. After explaining how open redirection attacks work, I'll This tutorial explains how you can prevent open redirection attacks in your ASP.NET MVC applications. This tutorial discusses the changes that have been made in the AccountController in ASP.NET MVC 3 and demonstrates how you can apply these changes in your existing ASP.NET MVC 1.0 and 2 applications. What is an Open Redirection Attack?
Any web application that redirects to a URL that is specified via the request such as the querystring or form data can potentially be tampered with to redirect users to an external, malicious URL. This tampering is called an open redirection attack. Whenever your application logic redirects to a specified URL, you must verify that the redirection URL hasn’t been tampered with. The login used in the default AccountController for both ASP.NET MVC 1.0 and ASP.NET MVC 2 is vulnerable to open redirection attacks. Fortunately, it is easy to update your existing applications to use the corrections from the ASP.NET MVC 3 Preview. To understand the vulnerability, let’s look at how the login redirection works in a default ASP.NET MVC 2 Web Application project. In this application, attempting to visit a controller action that has the [Authorize] attribute will redirect unauthorized users to the /Account/LogOn view. This redirect to /Account/LogOn will include a returnUrl querystring parameter so that the user can be returned to the originally requested URL after they have successfully logged in. In the screenshot below, we can see that an attempt to access the /Account/ChangePassword view when not logged in results in a redirect to /Account/LogOn?ReturnUrl=%2fAccount%2fChangePassword%2f.Read more: Jon Galloway
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