Secure Your Kubernetes Clusters to Stop Ransomware

While containers offer speed and flexibility that have not been possible before in the data center, they are also exposed to security threats such as ransomware, cryptomining, and botnets. According to the Red Hat State of Kubernetes Security Report 2021 surveying more than 500 DevOps, engineering, and security professionals, 94% of respondents experienced at least one security incident in their Kubernetes environments in the last 12 months. These incidents could potentially be exploited by threat actors to install ransomware and other types of malicious software, making the protection of Kubernetes clusters critical. 

What is a Kubernetes Cluster

A Kubernetes cluster is a set of nodes that run containerized applications. A Kubernetes cluster provides a complete ecosystem for the nodes including DNS services, load balancing, networking, autoscaling, and any other capability required for running applications operations. The Kubernetes cluster can host multiple applications using a built-in hierarchy structure and application segregation, with no restrictions on communications between namespaces.

A Kubernetes cluster is by default flat with no restrictions between the pods.
A Kubernetes cluster is by default flat with no restrictions between the pods 

Why Segment Kubernetes Clusters

In recent years, attacks on containers have become increasingly sophisticated. To avoid detection, attacks on Kubernetes clusters have increased their use of evasion and obfuscation techniques, including packing the payloads, using rootkits, and running malware straight from memory.

These environments allow communication between clusters and pods by default, even though it is not required for normal operations. Adversaries abuse this for lateral movement within their ransomware campaigns, so we need the ability to put policies in place that restrict these flows without disruption.

The key Capabilities for Segmenting Kubernetes Clusters

A good network segmentation solution requires four key elements:

Four key pillars to successful network segmentation solution
Four key pillars to successful network segmentation solution

Complete Visibility into Kubernetes clusters

Visibility is key in Kubernetes environments. The ability to know what’s running in your Kubernetes environment and to confirm that your traffic is going only where you want it to go is critical to successful policy creation. Guardicore, now part of Akamai, accurately visualizes Kubernetes clusters with insights into all layers of the infrastructure.

Inter-dependency maps. The solution provides a map for visualizing communications internally and across data centers for all types of technologies such as VMs, Kubernetes, docker containers and more. Based on these maps, you can view and detect any suspicious connection between pods, services, and hosts, or namespaces.

Labels. The maps accurately reflect the way the applications are deployed in the cluster by using multiple layers of labels. This visualization describes the Kubernetes hierarchy as it was planned by the app’s managers. This level of detail helps Akamai’s users understand exactly what is deployed in the cluster and the networking relations between the deployed apps and the rest of the infrastructure.  

Clusters represented on the Reveal map. Double-clicking a cluster reveals the namespaces and their interconnections within the cluster.
Clusters represented on the Reveal map. Double-clicking a cluster reveals the namespaces and their interconnections within the cluster.
Reveal map displays pod information including the Pod label and image name
Reveal map displays pod information including the Pod label and image name

Kubernetes Native Policy Enforcement

To help minimize the attack surface in your Kubernetes cluster, a strict segmentation policy is required. A segmentation enforcement solution should address two main criteria – be non-intrusive and without any scale and performance limitations; and provide a flexible way to ring fence all levels of Kubernetes objects including namespaces, controllers, and Kubernetes labels.

Akamai is leveraging the native Kubernetes Container Network Interface (CNI). The CNI consists of a network security policy plugin that was originally designed for network segmentation enforcement in Kubernetes. This is a non-intrusive method with no scale limitations.

Akamai has extended its best-of-breed templates to include dedicated templates designed for ring fencing Kubernetes business-critical applications. Using this template, the user can easily choose which object to ringfence – whether it’s a namespace, application, or any other object.

Kubernetes application ringfencing template
Kubernetes application ringfencing template

Advanced Monitoring

Using our advanced logging & monitoring system, our dedicated Network log is now adjusted to Kubernetes networking, displaying destination services, node IPs, source and destination ports, and processes for every event. This provides an easy way to investigate anomalous activity in the network and export data to a third-party application such as SIEM.

Cluster Operations

Securing Kubernetes assets begins with real-time visibility and operational awareness. A dedicated Cluster Operations screen provides all necessary data on the deployed clusters, including the number of agents monitoring the cluster, warnings, and alerts flagging on the agent’s function, state of the Kubernetes orchestration, and more. 

Summary

While most will agree that we need to “assume a breach”, there are few tools that allow us to act on this notion. Especially with new technologies like Kubernetes, tools that allow us to treat each asset as the perimeter are severely lacking. With Akamai Guardicore Segmentation, we’ve enabled businesses, even those with complex infrastructure, to act on the notion that threat actors have already breached our networks. Akamai’s solution for Kubernetes is non-intrusive, with no cluster scale limitations, providing comprehensive visibility into Kubernetes clusters and native Kubernetes enforcement that works with any operating system – all from the same console you’re using to manage the rest of your infrastructure.

From Guardicore's
Resource Center

Centra Platform ensures network microsegmentation for critical environment protection operating 24 x 7 x 365
Using the Mitre ATT&CK framework, this webinar will dive into the adversarial techniques that precede and follow the deployment of ransomware itself.
 

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