CVE-2023-47124
Traefik vulnerable to potential DDoS via ACME HTTPChallenge
Impact
## Impact There is a potential vulnerability in Traefik managing the ACME HTTP challenge. When Traefik is configured to use the [HTTPChallenge](https://doc.traefik.io/traefik/https/acme/#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 ([slowloris attack](https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/)). ## Patches - https://github.com/traefik/traefik/releases/tag/v2.10.6 - https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5 ## Workarounds Replace the HTTPChallenge with the [TLSChallenge](https://doc.traefik.io/traefik/https/acme/#tlschallenge) or the [DNSChallenge](https://doc.traefik.io/traefik/https/acme/#dnschallenge). ## For more information If you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/traefik/traefik/v2 | < 2.10.6 | 2.10.6 |
| go | github.com/traefik/traefik/v3 | < 3.0.0-beta5 | 3.0.0-beta5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Traefik | Traefik | through 2.10.5 Version 3.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
- https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
- https://github.com/advisories/GHSA-8g85-whqh-cr2f
- https://nvd.nist.gov/vuln/detail/CVE-2023-47124