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How to check the Origin header server-wide in IIS?
Could you please let me know how can we check the origin header server-wide in IIS to prevent CSRF through the configuration change only without adding a custom HTTP module in IIS? Thanks for contributing an answer to Information Security Stack Exchange!
How to prevent CSRF with the origin request header?
For sites to actively defend against CSRF, it is useful to determine which page triggers a request. If a site can determine where the request comes from, it can allow some sites and block others. The Referer header contains this information but is unreliable.
Why do we need to check the Origin header?
Checking the origin header is a good additional measure to prevent cross-site request forgery and related attacks. Although it is already implemented in browsers, its behavior is not defined enough to depend on the origin header to be present in particular requests.
How to prevent cross site request forgery ( XSRF / CSRF ) attacks?
If local storage is used to store the token, CSRF vulnerability might be mitigated because values from local storage aren’t sent automatically to the server with every request. Thus, using local storage to store the antiforgery token on the client and sending the token as a request header is a recommended approach.
What does the Origin header in http mean?
The Origin request header indicates where a fetch originates from. It doesn’t include any path information, but only the server name. It is sent with CORS requests, as well as with POST requests.
Is it necessary to check the referer and origin headers?
So to protect against CSRF it is necessary to block any requests that are missing a referer (and origin) header. Edit: This paper has some numbers on what portion of clients omit a referer header. OWASP recommends checking a CSRF token in addition to checking the origin and referer.