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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 can this attack on file upload functionality be exploited?
File uploads are not excluded. So how can this be exploited? If your site is example.com the attacker host some JS like this on a site that she tricks the victim into visiting: This will make the victims browser send a POST request to your site, with whatever the attacker chooses as fileContent as the file.
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.
How to protect against file uploads in OWASP?
Other than defining the extension of the uploaded file, its MIME-type can be checked for a quick protection against simple file upload attacks. This can be done preferrably in an allow list approach; otherwise, this can be done in a block list approach.
What is a cross site request forgery ( CSRF ) vulnerability?
Cross-site request forgery (CSRF) is a weakness within a web application which is caused by insufficient or absent verification of the HTTP request origin. Webservers are usually designed to accept all requests but due to the same-origin policy (SOP) the responses will be prevented from being read.
How is CSRF protection implemented in JSF 2.2?
In JSF 2.2, postback requests and non-postback requests (like GET) are inspected for protection. For postback requests, the client state or view state is “on” by default; for non-postback requests, a new configuration element, , was implemented.
How are Razor pages protected from XSRF / CSRF attacks?
Razor Pages are automatically protected from XSRF/CSRF. For more information, see XSRF/CSRF and Razor Pages. The most common approach to defending against CSRF attacks is to use the Synchronizer Token Pattern (STP). STP is used when the user requests a page with form data: