Contents
Does PKCE prevent CSRF?
PKCE protects your application against CSRF attacks. The client will not be able to provide the correct code_verifier because it is not bound to the session with the victim of the CSRF attack. PKCE binds the authorization request to the token request.
What is PKCE protection?
“PKCE (RFC 7636) is an extension to the Authorization Code flow to prevent several attacks and to be able to securely perform the OAuth exchange from public clients.”
What is state and nonce?
As you noted, state is for CSRF prevention while nonce is to prevent replay attacks in the single-page login flow since unlike the other flows it can’t pass along the client secret.
Is JWT a CSRF token?
To mitigate the known issues of this technique, the CSRF token is stored in a JWT. Additionally, the account identifier is included in this JWT as well for logged-in users. Storing the CSRF token in a JWT makes it possible for the back-end application to verify that it produced the token itself.
Which of the following is the most common result of a cross site request forgery?
It can result in damaged client relationships, unauthorized fund transfers, changed passwords and data theft—including stolen session cookies.
What’s the difference between PKCe and nonce?
The newer mechanisms PKCE (RFC7636) and the OpenID Connect parameter nonce not only protect against CSRF, but they also provide some level of protection against Code Injection attacks. In this document, I evaluate (informally) the differences in the provided protection levels of state, PKCE, and Nonce against CSRF and misuse of stolen codes.
Which is better PKCe or nonce for OAuth?
Traditionally, the state parameter is used to provide protection against Cross-Site Request Forgery (CSRF) attacks on OAuth. The newer mechanisms PKCE (RFC7636) and the OpenID Connect parameter nonce not only protect against CSRF, but they also provide some level of protection against Code Injection attacks.
When to use PKCe or nonce for CSRF protection?
If only PKCE or Nonce are used for CSRF protection, error responses can be spoofed. Recommendation: Although the value of this attack seems to be limited, it might be worthwhile to think about proper defense mechanisms. One way would be to return the code_challenge or nonce in the error response to the client.
How does the PKCe extension prevent an attack?
The PKCE extension prevents an attack where the authorization code is intercepted and exchanged for an access token by a malicious client, by providing the authorization server with a way to verify the same client instance that exchanges the authorization code is the same one that initiated the flow.