GHSA-9q69-g5gc-9fgf Cross-Site Request Forgery in Vert.x-Web framework

• Maven io.vertx:vertx-web: >= 4.0.0-milestone1, < 4.0.0-milestone5 → fixed in 4.0.0-milestone5 • Maven io.vertx:vertx-web: >= 4.0.0-milestone2, < 4.0.0-milestone5 → fixed in 4.0.0-milestone5 • Maven io.vertx:vertx-web: >= 4.0.0-milestone3, < 4.0.0-milestone5 → fixed in 4.0.0-milestone5 • Maven io.vertx:vertx-web: >= 4.0.0-milestone4, < 4.0.0-milestone5 → fixed in 4.0.0-milestone5

Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.