CVE-2023-47124

moderate-risk
Published 2023-12-04

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`.

Do I need to act?

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0.23% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (5)

Affected Vendors

Traefik

References (14)

Product https://doc.traefik.io/traefik/https/acme/#dnschallenge
Product https://doc.traefik.io/traefik/https/acme/#httpchallenge
Product https://doc.traefik.io/traefik/https/acme/#tlschallenge
Release Notes https://github.com/traefik/traefik/releases/tag/v2.10.6
Release Notes https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5
Third Party Advisory https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
Product https://doc.traefik.io/traefik/https/acme/#dnschallenge
Product https://doc.traefik.io/traefik/https/acme/#httpchallenge
Product https://doc.traefik.io/traefik/https/acme/#tlschallenge
Release Notes https://github.com/traefik/traefik/releases/tag/v2.10.6
Release Notes https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5
Third Party Advisory https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/
31
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 12/34 · Low