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Privilege Escalation in Kubernetes

Moderate severity GitHub Reviewed Published Apr 24, 2024 to the GitHub Advisory Database • Updated May 7, 2024

Package

gomod k8s.io/apimachinery (Go)

Affected versions

< 0.16.13
>= 0.17.0, < 0.17.9
>= 0.18.0, < 0.18.7

Patched versions

0.16.13
0.17.9
0.18.7
gomod k8s.io/kubernetes (Go)
< 1.16.13
>= 1.17.0, < 1.17.9
>= 1.18.0, < 1.18.7
1.16.13
1.17.9
1.18.7

Description

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.7 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.

References

Published by the National Vulnerability Database Jul 22, 2020
Published to the GitHub Advisory Database Apr 24, 2024
Reviewed Apr 24, 2024
Last updated May 7, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(98th percentile)

Weaknesses

URL Redirection to Untrusted Site ('Open Redirect')

A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Learn more on MITRE.

CVE ID

CVE-2020-8559

GHSA ID

GHSA-33c5-9fx5-fvjm

Source code

Credits

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