You're reading from Learn Kubernetes Security Securely orchestrate, scale, and manage your microservices in Kubernetes deployments

Product type Paperback

Published in Jul 2020

Publisher Packt

ISBN-13 9781839216503

Length 330 pages

Edition 1st Edition

Languages

C++

Tools

Kubernetes

Concepts

Cloud Security

Authors (2):

Pranjal Jumde

Kaizhe Huang

View More author details

Table of Contents (19) Chapters

Preface

1. Section 1: Introduction to Kubernetes

2. Chapter 1: Kubernetes Architecture FREE CHAPTER

3. Chapter 2: Kubernetes Networking

4. Chapter 3: Threat Modeling

5. Chapter 4: Applying the Principle of Least Privilege in Kubernetes

6. Chapter 5: Configuring Kubernetes Security Boundaries

7. Section 2: Securing Kubernetes Deployments and Clusters

8. Chapter 6: Securing Cluster Components

9. Chapter 7: Authentication, Authorization, and Admission Control

10. Chapter 8: Securing Kubernetes Pods

11. Chapter 9: Image Scanning in DevOps Pipelines

12. Chapter 10: Real-Time Monitoring and Resource Management of a Kubernetes Cluster

13. Chapter 11: Defense in Depth

14. Section 3: Learning from Mistakes and Pitfalls

15. Chapter 12: Analyzing and Detecting Crypto-Mining Attacks

16. Chapter 13: Learning from Kubernetes CVEs

17. Assessments

18. Other Books You May Enjoy

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The Privilege escalation issue in role parsing – CVE-2019-11247

We discussed RBAC in detail in Chapter 7, Authentication, Authorization, and Admission Control. Roles and RoleBindings allow users to get the privileges to perform certain actions. These privileges are namespaced. If a user needs a cluster-wide privilege, ClusterRoles and ClusterRolebindings are used. This issue allowed users to make cluster-wide modifications even if their privileges were namespaced. Configurations for admission controllers, such as Open Policy Access, could be modified by users with a namespaced role.

Mitigation strategy

You can use the following strategies to harden your cluster against this issue and issues similar to CVE-2019-11247 that haven't yet been found:

Avoid wildcards in Roles and RoleBindings: Roles and ClusterRoles should be specific to the resource names, verbs, and API groups. Adding * to roles can allow users to have access to resources that they should not...