2018-041: part 2 of Kubernetes security insights w/ ian Coldwater


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@IanColdwater https://www.redteamsecure.com/ *new gig*

So many different moving parts




She’s working on speaking schedule for 2019

How would I use these at home?


Kubernetes - up and running


General wikipedia article (with architecture diagram): https://en.wikipedia.org/wiki/Kubernetes

https://twitter.com/alicegoldfuss - Alice Goldfuss

Derbycon Talk: http://www.irongeek.com/i.php?page=videos/derbycon8/track-3-10-perfect-storm-taking-the-helm-of-kubernetes-ian-coldwater

Tesla mis-configured Kubes env:

From the talk: https://arstechnica.com/information-technology/2018/02/tesla-cloud-resources-are-hacked-to-run-cryptocurrency-mining-malware/

Redlock report mentioned in Ars article: https://redlock.io/blog/cryptojacking-tesla

Setup your own K8s environment: https://kubernetes.io/docs/setup/pick-right-solution/#local-machine-solutions (many options to choose from)

Securing K8s implementations: https://kubernetes.io/docs/tasks/administer-cluster/securing-a-cluster/

https://github.com/aquasecurity/kube-hunter -

Threat Model What R U protecting?

Who R U protecting from?

What R your Adversary’s capabilities?

What R your capabilities?

Defenders think in Lists

Attackers think in Graphs

What are some of the visible ports used in K8S?

44134/tcp - Helmtiller, weave, calico

10250/tcp - kubelet (kublet exploit)

No authN, completely open

10255/tcp - kublet port (read-only)

4194/tcp - cAdvisor

2379/tcp - etcd

Etcd holds all the configs

Config storage

Engineering workflow:

Ephemeral -

CVE for K8S subpath - https://kubernetes.io/blog/2018/04/04/fixing-subpath-volume-vulnerability/

Final points:

Advice securing K8S is standard security advice

Use Defense in Depth, and least Privilege

Be aware of your attack surface

Keep your threat model in mind

David Cybuck (questions from Slack channel)

My questions are: 1. Talk telemetry? What is the best first step for having my containers or kubernetes report information? (my overlords want metrics dashboards which lead to useful metrics).

  1. How do you threat model your containers? Has she ever or how would she begin to run a table-top exercise, a cross between a threat model and a disaster recovery walk through, for the container infrastructure?

  1. Mitre Att&ck framework, there is a spin off for mobile. Do we need one for Kube, swarm, or DC/OS?

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