CVE-2020-8559

Privilege escalation from compromised node to cluster

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.6 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.

El Kubernetes kube-apiserver en versiones v1.6-v1.15 y versiones anteriores a v1.16.13, v1.17.9 y v1.18.6, son vulnerables a un redireccionamiento no validado en las peticiones de actualización proxy que podrían permitir a un atacante escalar privilegios desde un compromiso de nodo a un compromiso del clúster completo

A flaw was found in the Kubernetes API server, where it allows an attacker to escalate their privileges from a compromised node. This flaw allows an attacker who can intercept requests on a compromised node, to redirect those requests, along with their credentials, to perform actions on other endpoints that trust those credentials (including other clusters), allowing for escalation of privileges. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.

*Credits: Wouter ter Maat of Offensi

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-03 CVE Reserved
2020-07-22 CVE Published
2020-07-23 First Exploit
2024-04-01 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

CAPEC

References (6)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20200810-0004	Third Party Advisory

URL	Date	SRC
https://github.com/tdwyer/CVE-2020-8559	2020-07-23
https://github.com/kubernetes/kubernetes/issues/92914	2024-09-16
https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ	2024-09-16

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2020-8559	2021-02-03
https://bugzilla.redhat.com/show_bug.cgi?id=1851422	2021-02-03

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"				>= 1.6.0 <= 1.15.0 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.6.0 <= 1.15.0"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.16.0 < 1.16.13 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.16.0 < 1.16.13"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.17.0 < 1.17.9 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.17.0 < 1.17.9"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.18.0 < 1.18.6 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.18.0 < 1.18.6"		-		Affected