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Traefik vulnerable to potential DDoS via ACME HTTPChallenge

Moderate severity GitHub Reviewed Published Dec 4, 2023 in traefik/traefik • Updated Dec 5, 2023

Package

gomod github.com/traefik/traefik/v2 (Go)

Affected versions

< 2.10.6

Patched versions

2.10.6
gomod github.com/traefik/traefik/v3 (Go)
< 3.0.0-beta5
3.0.0-beta5

Description

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

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.

References

@nmengin nmengin published to traefik/traefik Dec 4, 2023
Published by the National Vulnerability Database Dec 4, 2023
Published to the GitHub Advisory Database Dec 5, 2023
Reviewed Dec 5, 2023
Last updated Dec 5, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.102%
(43rd percentile)

Weaknesses

CVE ID

CVE-2023-47124

GHSA ID

GHSA-8g85-whqh-cr2f

Source code

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