Tuleap is an Open Source Suite to improve management of software developments and collaboration. Tuleap Community Edition prior to version 16.13.99.1762267347 and Tuleap Enterprise Edition prior to versions 17.01-, 16.13-6, and 16.12-9 dont have cross-site request forgery protections in the file release system. An attacker could use this vulnerability to trick victims into changing the commit rules or immutable tags of a SVN repo. Tuleap Community Edition 16.13.99.1762267347, Tuleap Enterprise Edition 17.0-1, Tuleap Enterprise Edition 16.13-6, and Tuleap Enterprise Edition 16.12-9 fix the issue.
Weakness
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
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 [REF-1482].
- 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