CVE-2023-47106

Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Traefik es un equilibrador de carga y proxy inverso HTTP de código abierto. Cuando se envía una solicitud a Traefik con un fragmento de URL, Traefik codifica automáticamente la URL y reenvía el fragmento al servidor backend. Esto viola RFC 7230 porque en el formulario de origen la URL solo debe contener la ruta absoluta y la consulta. Cuando esto se combina con otro proxy de interfaz como Nginx, se puede utilizar para evitar las restricciones de control de acceso basadas en URI del proxy de interfaz. Esta vulnerabilidad se ha solucionado en las versiones 2.10.6 y 3.0.0-beta5. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-10-30 CVE Reserved
2023-12-04 CVE Published
2023-12-08 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation

CAPEC

References (4)

URL	Tag	Source
https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1	Not Applicable
https://github.com/traefik/traefik/releases/tag/v2.10.6	Release Notes
https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5	Release Notes

URL	Date	SRC
https://github.com/traefik/traefik/security/advisories/GHSA-fvhj-4qfh-q2hm	2024-08-02

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Traefik Search vendor "Traefik"		Traefik Search vendor "Traefik" for product "Traefik"				<= 2.10.5 Search vendor "Traefik" for product "Traefik" and version " <= 2.10.5"		-		Affected
Traefik Search vendor "Traefik"		Traefik Search vendor "Traefik" for product "Traefik"				3.0.0 Search vendor "Traefik" for product "Traefik" and version "3.0.0"		beta1		Affected
Traefik Search vendor "Traefik"		Traefik Search vendor "Traefik" for product "Traefik"				3.0.0 Search vendor "Traefik" for product "Traefik" and version "3.0.0"		beta2		Affected
Traefik Search vendor "Traefik"		Traefik Search vendor "Traefik" for product "Traefik"				3.0.0 Search vendor "Traefik" for product "Traefik" and version "3.0.0"		beta3		Affected
Traefik Search vendor "Traefik"		Traefik Search vendor "Traefik" for product "Traefik"				3.0.0 Search vendor "Traefik" for product "Traefik" and version "3.0.0"		beta4		Affected