// For flags

CVE-2020-15127

Denial of service in Contour

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Contour ( Ingress controller for Kubernetes) before version 1.7.0, a bad actor can shut down all instances of Envoy, essentially killing the entire ingress data plane. GET requests to /shutdown on port 8090 of the Envoy pod initiate Envoy's shutdown procedure. The shutdown procedure includes flipping the readiness endpoint to false, which removes Envoy from the routing pool. When running Envoy (For example on the host network, pod spec hostNetwork=true), the shutdown manager's endpoint is accessible to anyone on the network that can reach the Kubernetes node that's running Envoy. There is no authentication in place that prevents a rogue actor on the network from shutting down Envoy via the shutdown manager endpoint. Successful exploitation of this issue will lead to bad actors shutting down all instances of Envoy, essentially killing the entire ingress data plane. This is fixed in version 1.7.0.

En Contour (Controlador de ingreso para Kubernetes) anterior a la versión 1.7.0, un actor malo puede cerrar todas las instancias de Envoy, esencialmente eliminando todo el plano de entrada de datos. Las peticiones GET hacia /shutdown en el puerto 8090 del pod Envoy inician el procedimiento de apagado de Envoy. El procedimiento de apagado incluye cambiar el endpoint readiness a falso, lo que elimina a Envoy del grupo de enrutamiento. Cuando se ejecuta Envoy (por ejemplo, en la red host, pod especifica hostNetwork=true), el endpoint del administrador de cierre es accesible para cualquier persona en la red que pueda alcanzar el nodo Kubernetes que ejecuta Envoy. No existe una autenticación que impida a un actor malicioso de la red cerrar Envoy por medio del endpoint del administrador de cierre. Una explotación con éxito de este problema llevará a que los actores malos cierren todas las instancias de Envoy, esencialmente eliminando todo el plano de datos de ingreso. Esto es corregido en la versión 1.7.0

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-06-25 CVE Reserved
  • 2020-08-05 CVE Published
  • 2023-04-21 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-306: Missing Authentication for Critical Function
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Projectcontour
Search vendor "Projectcontour"
 Contour
Search vendor "Projectcontour" for product "Contour"
 < 1.7.0
Search vendor "Projectcontour" for product "Contour" and version " < 1.7.0"
kubernetes
Affected