GitHub Advisory DatabaseGHSA-8G85-WHQH-CR2FTraefik vulnerable to potential DDoS via ACME HTTPChallenge
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
42.0%
Impact
There is a potential vulnerability in Traefik managing the ACME HTTP challenge.
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 (slowloris attack).
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 or the DNSChallenge.
For more information
If you have any questions or comments about this advisory, please open an issue.
Affected configurations
References
doc.traefik.io/traefik/https/acme/#dnschallenge
doc.traefik.io/traefik/https/acme/#httpchallenge
doc.traefik.io/traefik/https/acme/#tlschallenge
github.com/advisories/GHSA-8g85-whqh-cr2f
github.com/traefik/traefik/releases/tag/v2.10.6
github.com/traefik/traefik/releases/tag/v3.0.0-beta5
github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
nvd.nist.gov/vuln/detail/CVE-2023-47124
www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/
Related
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
42.0%