CVE-2020-8554: Unverified Ownership in Kubernetes

k8s.io/kubernetes Updated 02 Oct 2025

Summary

08/02/2022

Disclosed on

CVE-2020-8554

CVE

No i

Fix available

Moderate

Severity

5.0

CVSS Score

CVE-2020-8554: Unverified Ownership in Kubernetes. Affects k8s.io/kubernetes versions < 1.22.0. No fix is published. How to fix ↓

Also tracked for

kubernetes · Debian:13

The same CVE-2020-8554 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.

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Background

Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. It provides a robust API server that allows users to interact with the Kubernetes cluster. The vulnerability identified as CVE-2020-8554 affects the Kubernetes API server in all versions. It allows an attacker to create a ClusterIP service and manipulate the spec.externalIPs field, enabling them to intercept traffic to a specific IP address. Additionally, an attacker with privileged access can modify the status of a LoadBalancer service, specifically the status.loadBalancer.ingress.ip field, to achieve a similar effect.

Vulnerability Detail

The vulnerability arises from the lack of proper verification of ownership in Kubernetes. By exploiting this vulnerability, an attacker can redirect traffic intended for a specific IP address to their own malicious endpoint. This can lead to various security risks, such as intercepting sensitive data or launching man-in-the-middle attacks. The impact of this vulnerability can be significant, as it allows an attacker to manipulate network traffic within the Kubernetes cluster.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

As a temporary workaround, users can restrict access to the Kubernetes API server to trusted entities only. This can be achieved by implementing network policies or firewall rules that limit access to the API server from specific IP ranges or networks. Additionally, it is crucial to regularly monitor the Kubernetes cluster for any unauthorized changes to services and their associated configurations.

Conclusion

The vulnerability identified as CVE-2020-8554 in Kubernetes allows an attacker to intercept traffic within the cluster by manipulating service configurations. To mitigate this vulnerability, it is crucial to update Kubernetes to a version that includes the necessary patches. Additionally, implementing network restrictions and regularly monitoring the cluster for unauthorized changes are recommended. For further support on vulnerability remediation, please contact DevNack.com.

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