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In short, CSRF abuses the trust relationship between browser andserver. This means that anything that a server uses in order toestablish trust with a browser (e.g., cookies, but also HTTP/WindowsAuthentication) is exactly what allows CSRF to take place - but thisonly the first piece for a successful CSRF attack.

The second piece is a web form or request which contains parameterspredictable enough that an attacker could craft their own maliciousform/request which, in turn, would be successfully accepted by thetarget service. Then, usually through social engineering or XSS, thevictim would trigger that malicious form/request submission whileauthenticated to the legitimate service. This is where thebrowser/server trust is exploited.

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In order to prevent CSRF in ASP.NET, anti-forgery tokens (also known asrequest verification tokens) must be utilized.

These tokens are simply randomly-generated values included in anyform/request that warrants protection. Note that this value should beunique for every individual session. This guarantees that everyform/request is tied to the authenticated user and, therefore, protectedfrom CSRF.

Important: non-idempotent GET requestsrepresent an anti-pattern where CSRF protection is concerned. Always usePOST requests with anti-CSRF tokens for proper protection.

Please note that the following examples may not entail a completeanti-CSRF solution for any given Web application. Specific requirementsmay call for adjustments and/or combinations of different strategies.

Solutions NOT considered secure

• All of the solutions provided in this article are not designed towork with GET requests that change the server state (e.g.,/example/delete.aspx?id=1). GET requests should beidempotent so that CSRFcannot take place.

• Assuming that SSL/TLS will thwart CSRF attacks just because thecookie is marked “Secure” and/or “HTTPOnly”. The problem lies in thetrust between legitimate browser and server. Therefore, the browser willjust send its current cookies when the forged request is triggered. Theattacker never has to touch any cookies.

• Referer header verification as the only protection. This can beeasily manipulated.

• Cookie double-submission when the cookie utilized is the sessioncookie. This exposes the session cookie to JavaScript. Always mark thesession cookie “HTTPOnly” so that it cannot be accessed with JavaScript.

• Any CSRF protection is null and void given the presence of XSS, forseveral reasons. The main and obvious reason is that, through XSS, theattacker can hijack the session and spoof the user, not even having toworry about performing CSRF.

ASP.NET MVC and Web API: Anti-CSRF Token

ASP.NET has the capability to generate anti-CSRF security tokens forconsumption by your application, as such:

1) Authenticated user (has session which is managed by the framework)requests a page which contains form(s) that changes the server state(e.g., user options, account transfer, file upload, admin functions,etc.)

2) Generate the security token (or grab it from the session state) andsend the token as a session cookie (again, managed in the session state,unique per session) as well as within a hidden value in each form.

3) Once the user submits the form, validate the token stored in thesession state against the token included in the submitted form value. Onfailure, disregard form.

Effectively, this is the cookie double-submission approach done right,since the security token is submitted both as a cookie (managed in theframework session state) and within a hidden form value at the sametime.

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For implementation details, see:MVC CSRF Prevention (official ASP.NET blog)Web API CSRF Prevention (official ASP.NET blog)

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The standard frequency of token generation is per-session, so makesure your sessions have a reasonable/configurable time-out. It ispossible to issue new tokens on a per-request basis. However, the addedprotection may be insignificant, if this approach even fits yourapplication. See the link below for a discussion on the matter:Why refresh CSRF token per form request?

WebForms: ViewState

Requirement:EnableViewStateMacmust be set.In fact, the ViewState MAC can no longer be disabled for versions sinceSeptember 2014.

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The ASP.NET ViewState contains a property,ViewStateUserKey,which offers protection against CSRF by adding uniqueness to theViewState MAC as long as you set it to a new value for every session.

Note that ViewStateUserKey will not actually add a new value to theViewState, but rather simply influence the MAC process so as to makeevery MAC unique per user session. Therefore, setting ViewStateUserKeyto the current Session ID is acceptable.

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Since Visual Studio 2012, the anti-CSRF mechanism has been improved.

The new strategy still uses the ViewState as the main entity for CSRFprotection but also makes use of tokens (which you can generate asGUIDs) so that you can set the ViewStateUserKey to the token rather thanthe Session ID, and then validate it against the cookie.

Here’s a blog post by Eric Johnson and James Jardinewith an example of this implementation.

For more implementation details, see:MSDN - Securing ViewStateMSDN - ViewStateUserKey

Considerations for AJAX

Depending on your application, you’ll likely have to choose betweenusing HTTP Headers or POST data to carry your anti-CSRF tokens.

Whatever you choose, the optimal validation method is indeed throughtokens. This means you can follow the token strategy while creatingeither a custom header to hold the token value or just sending thetoken with the rest of the POST data.

For more guidance, see the answers given to the followingquestions:Anti-CSRF CookieCSRF Protection With Custom Headers