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CVE-2023-47124

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Date: December 4, 2023

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`.

Language: Go

Severity Score

Related Resources (11)

https://doc.traefik.io/traefik/https/acme/#tlschallenge
https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
https://doc.traefik.io/traefik/https/acme/#httpchallenge
https://github.com/traefik/traefik
https://github.com/traefik/traefik/releases/tag/v2.10.6
https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5
https://nvd.nist.gov/vuln/detail/CVE-2023-47124
https://doc.traefik.io/traefik/https/acme/#dnschallenge
ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/
https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
https://www.mend.io/vulnerability-database/CVE-2023-47124

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

Missing Release of Resource after Effective Lifetime

CWE-772

Top Fix

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Upgrade Version

Upgrade to version v2.10.6

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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