your_spotify is an open source, self hosted Spotify tracking dashboard. YourSpotify versions < 1.9.0 do not protect the API and login flow against Cross-Site Request Forgery (CSRF). Attackers can use this to execute CSRF attacks on victims, allowing them to retrieve, modify or delete data on the affected YourSpotify instance. Using repeated CSRF attacks, it is also possible to create a new user on the victim instance and promote the new user to instance administrator if a legitimate administrator visits a website prepared by an attacker. Note: Real-world exploitability of this vulnerability depends on the browser version and browser settings in use by the victim. This issue has been addressed in version 1.9.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.
Potential Mitigations
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, use anti-CSRF packages such as the OWASP CSRFGuard. [REF-330]
- Another example is the ESAPI Session Management control, which includes a component for CSRF. [REF-45]
- Use the “double-submitted cookie” method as described by Felten and Zeller:
- When a user visits a site, the site should generate a pseudorandom value and set it as a cookie on the user’s machine. The site should require every form submission to include this value as a form value and also as a cookie value. When a POST request is sent to the site, the request should only be considered valid if the form value and the cookie value are the same.
- Because of the same-origin policy, an attacker cannot read or modify the value stored in the cookie. To successfully submit a form on behalf of the user, the attacker would have to correctly guess the pseudorandom value. If the pseudorandom value is cryptographically strong, this will be prohibitively difficult.
- This technique requires Javascript, so it may not work for browsers that have Javascript disabled. [REF-331]
References