Can a CSRF token be reused?

We recently had a pentest running and one security flaw that was reported is that CSRF-Tokens can be reused over multiple requests. … Although, the latter embedded CSRF token seems to differ each request, when using an already used CSRF-Token a form can be validated again and again.

Is CSRF token one time use?

The you create one token for the current 30 minutes in the form. When then form is submitted and you verify the token against for now and against the previous 30 minute period. Therefore a token is valid for 30 minutes up to one hour.

Does CSRF token expire?

At the very least, though, CSRF tokens should expire when the login session expires or when the user logs out. There’s no expectation by the user that a form that you brought up BEFORE you logged out will continue to work AFTER you log back in again.

What can you do with a CSRF token?

CSRF tokens can prevent CSRF attacks by making it impossible for an attacker to construct a fully valid HTTP request suitable for feeding to a victim user.

Can CSRF token be stolen?

Stealing Anti-CSRF Tokens: When CSRF tokens are passed as cookie parameters without Secure and HTTPOnly flags, an attacker can potentially steal the CSRF token via XSS or other attacks.

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How do I invalidate CSRF tokens?

Google Chrome users

  1. Open Chrome Settings.
  2. Scroll to the bottom and click on Advanced.
  3. In the Privacy and security section, click on Content Settings.
  4. Click on Cookies.
  5. Next to Allow, click Add copy and paste “[*.] …
  6. Under All cookies and site data, search for HappyFox, and delete all HappyFox related entries.

Should I replace CSRF token?

Changing the CSRF token on every request provides adequate protection against BREACH, and both Django and Rails have implemented changing CSRF tokens. Both frameworks have implemented it by encoding the actual CSRF token. The token is encoded randomly on each page, thus preventing repetitive output.

Is CSRF needed for REST API?

I would personally try to avoid using cookies with REST APIs, but there may very well be reasons to use them anyway. Either way, the overall answer is simple: if you are using cookies (or other authentication methods that the browser can do automatically) then you need CSRF protection.

How do I make a Csrftoken?

How should CSRF tokens be generated?

  1. Use a well-established random number generator with enough entropy.
  2. Make sure tokens can’t be reused. …
  3. Verify the received token is the same as the set token in a safe way, for example, compare hashes.
  4. Do not send CSRF tokens in HTTP GET requests.

Why is CSRF important?

Why CSRF is important

CSRF attacks can be used on a huge array of sites. If a site allows data to be altered on the user side, then it is a potential target for an attacker. … This shows the scale of a possible attack and why CSRF protection is an essential part of any web security package.

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Does JWT prevent CSRF?

If you put your JWTs in a header, you don’t need to worry about CSRF. You do need to worry about XSS, however. If someone can abuse XSS to steal your JWT, this person is able to impersonate you.

What is XSS and CSRF?

Cross-site scripting (or XSS) allows an attacker to execute arbitrary JavaScript within the browser of a victim user. Cross-site request forgery (or CSRF) allows an attacker to induce a victim user to perform actions that they do not intend to.

Why is CSRF difficult to detect?

The apparent validity of CSRF traffic makes is difficult to block. Web developers must protect their sites by applying measures beyond authenticating the user. After all, the forged request originates from the user even if the user isn’t aware of it. Hence, the site must authenticate the request and the user.