CVE-2020-8561

Webhook redirect in kube-apiserver

Severity Score

4.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

Se ha detectado un problema de seguridad en Kubernetes donde los actores que controlan las respuestas de las peticiones MutatingWebhookConfiguration o ValidatingWebhookConfiguration son capaces de redirigir las peticiones de kube-apiserver a redes privadas del apiserver. Si ese usuario puede visualizar los registros de kube-apiserver cuando el nivel de registro se establece en 10, puede visualizar las respuestas redirigidas y los encabezados en los registros

*Credits: QiQi Xu

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-03 CVE Reserved
2021-09-20 CVE Published
2023-08-07 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
CWE-610: Externally Controlled Reference to a Resource in Another Sphere

CAPEC

References (3)

URL	Tag	Source
https://github.com/kubernetes/kubernetes/issues/104720	Mitigation
https://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY	Mailing List
https://security.netapp.com/advisory/ntap-20211014-0002	Third Party Advisory

URL	Date	SRC

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
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				1.20.11 Search vendor "Kubernetes" for product "Kubernetes" and version "1.20.11"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				1.21.5 Search vendor "Kubernetes" for product "Kubernetes" and version "1.21.5"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				1.22.2 Search vendor "Kubernetes" for product "Kubernetes" and version "1.22.2"		-		Affected