Description
Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
traefik traefik
< 2.10.6affected>= 3.0.0-beta1, < 3.0.0-beta5affected
References
- https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f ↗
- https://doc.traefik.io/traefik/https/acme/#dnschallenge ↗
- https://doc.traefik.io/traefik/https/acme/#httpchallenge ↗
- https://doc.traefik.io/traefik/https/acme/#tlschallenge ↗
- https://github.com/traefik/traefik/releases/tag/v2.10.6 ↗
- https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5 ↗
- https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris ↗