Description
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.
CVSS breakdown
Affected products
- traefik / traefik>= 3.7.0-ea.1, < 3.7.3 – >= 3.7.0-ea.1, < 3.7.3
- traefik / traefik>= 3.0.0-beta1, < 3.6.19 – >= 3.0.0-beta1, < 3.6.19
- traefik / traefik< 2.11.48 – < 2.11.48