Book Image

Learn Kubernetes Security

By : Kaizhe Huang, Pranjal Jumde
5 (1)
Book Image

Learn Kubernetes Security

5 (1)
By: Kaizhe Huang, Pranjal Jumde

Overview of this book

Kubernetes is an open source orchestration platform for managing containerized applications. Despite widespread adoption of the technology, DevOps engineers might be unaware of the pitfalls of containerized environments. With this comprehensive book, you'll learn how to use the different security integrations available on the Kubernetes platform to safeguard your deployments in a variety of scenarios. Learn Kubernetes Security starts by taking you through the Kubernetes architecture and the networking model. You'll then learn about the Kubernetes threat model and get to grips with securing clusters. Throughout the book, you'll cover various security aspects such as authentication, authorization, image scanning, and resource monitoring. As you advance, you'll learn about securing cluster components (the kube-apiserver, CoreDNS, and kubelet) and pods (hardening image, security context, and PodSecurityPolicy). With the help of hands-on examples, you'll also learn how to use open source tools such as Anchore, Prometheus, OPA, and Falco to protect your deployments. By the end of this Kubernetes book, you'll have gained a solid understanding of container security and be able to protect your clusters from cyberattacks and mitigate cybersecurity threats.
Table of Contents (19 chapters)
1
Section 1: Introduction to Kubernetes
7
Section 2: Securing Kubernetes Deployments and Clusters
14
Section 3: Learning from Mistakes and Pitfalls

The path traversal issue in kubectl cp – CVE-2019-11246

Developers often copy files to or from containers in a Pod for debugging. kubectl cp allows developers to copy files from or to a container in a Pod (by default, this is done in the first container within the Pod).

To copy files to a Pod, you can use the following:

kubectl cp /tmp/test <pod>:/tmp/bar

To copy files from a Pod, you can use the following:

kubectl cp <some-pod>:/tmp/foo /tmp/bar

When files are copied from a pod, Kubernetes first creates a TAR archive of the files inside the container. It then copies the TAR archive to the client and then finally unpacks the TAR archive for the client. In 2018, researchers found a way to use kubectl cp to overwrite files on the client's host. If an attacker has access to a pod, this vulnerability could be used to replace the TAR archive with special files that use relative paths by overwriting the original TAR binary with a malicious one. When...