Is CSRF necessary?
Server headers are generally easy for an attacker to manipulate. However, a comparison of existing server headers does not provide sufficient protection against CSRF attacks, which is why a matching CSRF token is necessary. A CSRF token should be sent with every action that can result in a change of status.
Does CSRF only work with GET requests?
Only accepting POST requests Applications can be developed to only accept POST requests for the execution of business logic. The misconception is that since the attacker cannot construct a malicious link, a CSRF attack cannot be executed. Unfortunately, this logic is incorrect.
Why are GET requests vulnerable to CSRF attacks?
Apps that change state on GET requests, where variables or resources are altered, are vulnerable to malicious attacks. GET requests that change state are insecure. A best practice is to never change state on a GET request. CSRF attacks are possible against web apps that use cookies for authentication because:
How is SameSite used to mitigate CSRF attacks?
SameSite is a cookie attribute (similar to HTTPOnly, Secure etc.) which aims to mitigate CSRF attacks. It is defined in RFC6265bis. This attribute helps the browser decide whether to send cookies along with cross-site requests. Possible values for this attribute are Lax, Strict, or None.
How does cross-site request forgery ( CSRF ) attack work?
Cross-Site Request Forgery (CSRF) is a type of attack that occurs when a malicious web site, email, blog, instant message, or program causes a user’s web browser to perform an unwanted action on a trusted site when the user is authenticated. A CSRF attack works because browser requests automatically include all cookies including session cookies.
Which is the best framework for CSRF protection?
It is strongly recommended to research if the framework you are using has an option to achieve CSRF protection by default before trying to build your custom token generating system. For example, .NET has built-in protection that adds a token to CSRF vulnerable resources.