Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik
CVE-2023-47106

6.5MEDIUM

Key Information:

Vendor

traefik

Status
traefik
Vendor
CVE Published:
4 December 2023

What is CVE-2023-47106?

Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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Affected Version(s)

traefik < 2.10.6 < 2.10.6

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

References

https://github.com/traefik/traefik/security/advisories/GH...
x_refsource_CONFIRM
https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1
x_refsource_MISC
https://github.com/traefik/traefik/releases/tag/v2.10.6
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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