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Vulnerability · Published Dec 4, 2023 · Assigned by GitHub_M

CVE-2023-47124Denial of service whith ACME HTTPChallenge in Traefik

Medium 5.9

In plain English

A medium-severity security flaw in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.8%top 43.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGO-2023-2381
Gogithub.com/traefik/traefik/v22.10.6GHSA-8g85-whqh-cr2f
Gogithub.com/traefik/traefik/v22.10.6GO-2023-2381
Gogithub.com/traefik/traefik/v33.0.0-beta5GHSA-8g85-whqh-cr2f
Gogithub.com/traefik/traefik/v33.0.0-beta5GO-2023-2381

Affected products (as reported)

VendorProductVersions
traefik traefik < 2.10.6>= 3.0.0-beta1, < 3.0.0-beta5

Weakness: CWE-772 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References