{"id":82347,"date":"2022-05-30T06:54:01","date_gmt":"2022-05-30T12:24:01","guid":{"rendered":"https:\/\/www.whizlabs.com\/blog\/?p=82347"},"modified":"2024-03-08T09:37:45","modified_gmt":"2024-03-08T04:07:45","slug":"kubernetes-security-best-practices","status":"publish","type":"post","link":"https:\/\/www.whizlabs.com\/blog\/kubernetes-security-best-practices\/","title":{"rendered":"11 Kubernetes Security Best Practices you should follow in 2024"},"content":{"rendered":"

Here in this article, we are going to see about Kubernetes security best practices in detail. Kubernetes is an open-source container orchestration tool that has complex architecture and takes a lot of effort to configure and manage. When it comes to deploying the applications in a production environment, two major parts to consider are high availability and security.\u00a0<\/span><\/p>\n

You need to address the possible vulnerabilities in the Kubernetes architecture<\/a> and implement security best practices to run the application workloads safely.\u00a0<\/span><\/p>\n

While working on the Kubernetes clusters, there are many factors we need to keep in mind in terms of security. In this tutorial, we will see some of the security practices that can be used to deploy and manage applications using Kubernetes(k8s).\u00a0<\/span><\/p>\n

Possible Kubernetes Vulnerabilities<\/h3>\n

Before seeing the security best practices, let us see some of the possible vulnerability gateways for the Kubernetes<\/a> so that we can understand why it is so important to follow the security standards.\u00a0<\/span><\/p>\n

Container Vulnerability<\/h4>\n

If there are any vulnerabilities in the POD configuration, an attacker can get into the container and it will lead to further possible vulnerabilities in networks and processes.\u00a0<\/span><\/p>\n

Container to Container Connection<\/h4>\n

If an attacker finds a way to connect to a container then he\/she can try to connect to other containers and spread malicious files.<\/span><\/p>\n

Vulnerable Host<\/h4>\n

Since most of the nodes are running on the cloud, an attack on any node is a big threat to the cluster it belongs to.\u00a0<\/span><\/p>\n

Cloud platform vulnerability<\/h4>\n

Cloud platforms<\/a> such as AWS, Azure, Google Cloud, etc expose data to their services that can be accessible by pods. These data may have some confidential information that becomes a vulnerability for the Kubernetes cluster.\u00a0<\/span><\/p>\n

Unauthenticated Access<\/h4>\n

If Kubernetes APIs are not authenticated properly, attackers can deploy malicious codes.\u00a0<\/span><\/p>\n

Security Best Practices<\/h3>\n

Whether it’s on-premise or cloud, most of the attacks rely on network vulnerabilities. Same applies to the containers as well. So securing the network should be your first priority when you think about securing your architecture and deployments.\u00a0<\/span><\/b><\/p>\n

1. Kubernetes Role-Based Access Control (RBAC)<\/b><\/p>\n

Role Based Access Control (RBAC) defines who is accessing the Kubernetes API and what are the permissions the accessor has. RBAC is usually enabled by default and while using it a namespace-specific permissions are recommended. Always use least privileged permissions and allow access only if it\u2019s absolutely necessary.<\/span><\/b><\/p>\n

2. Protecting etcd cluster<\/b><\/p>\n

etcd is an open source consistent key-value store for shared configuration. Since it stores critical and sensitive information, it\u2019s mandatory to protect it. If the data in etcd is compromised, then it\u2019s possible for the person who gets access to take over the cluster. Protecting etcd with TLS is recommended.<\/span><\/p>\n

The following configuration options are used for the TLS client-server communication for the etcd:\u00a0<\/span><\/p>\n

cert-file= : Certificate used for TLS connections<\/span><\/p>\n

–key-file= : Certificate key<\/span><\/p>\n

–client-cert-auth : Checks for a client certificate on incoming HTTPS requests<\/span><\/p>\n

–trusted-ca-file=<path> : Certification authority<\/span><\/p>\n

–auto-tls :\u00a0 Self signed certificate<\/span><\/p>\n

For the server-server communication, following configuration is used:<\/span><\/p>\n

–peer-cert-file=<path> : Certificate used for TLS connections<\/span><\/p>\n

–peer-key-file=<path> : Certificate key<\/span><\/p>\n

–peer-client-cert-auth : Checks for a valid signed client certificate on incoming requests<\/span><\/p>\n

–peer-trusted-ca-file=<path> : Certification authority<\/span><\/p>\n

–peer-auto-tls : Self signed certificate<\/span><\/b><\/p>\n

3. etcd encryption at rest<\/b><\/p>\n

We can enable the etcd encryption using the kube-apiserver process. For that, we need to pass the argument -encryption-provider-config.\u00a0<\/span><\/b><\/p>\n

4. Isolating Kubernetes Nodes<\/b><\/p>\n

As another best practice to make the architecture secure, it is recommended that not to expose the kubernetes nodes to the public networks. We can utilize network access control list (ACL) for that. Configure the nodes with ingress controller and allow traffic only from the master node on a specific port.\u00a0<\/span><\/b><\/p>\n

5. Audit Logging<\/b><\/p>\n

Logging or storing authentication logs will help identify any suspicious activity or attacks. Usually failed API calls will show a message as forbidden. There are four logging levels available. None, Metadata only,\u00a0<\/span><\/b><\/p>\n

6. Process Whitelisting<\/b><\/p>\n

We need to identify the running processes during the normal application behavior. Process whitelisting will help us to identify any unexpected running processes at a given time.\u00a0<\/span><\/b><\/p>\n

7. Keeping the Latest Kubernetes Version<\/b><\/p>\n

Upgrading kubernetes is one of the complex processes. Running the latest version of kubernetes has an advantage of eliminating known vulnerabilities of the previous versions. Check for the automatic upgrade options from the providers.\u00a0<\/span><\/b><\/p>\n

8. Lock Down Kubelet<\/b><\/p>\n

As we know that kubelet is running on each node, it is used to communicate with container runtime and reports the metrics. Each kubelet in the kubernetes cluster exposes an API, if an unauthorized user gets access to it, they can take over the entire cluster. So locking the kubelet minimizes the risk for the attacks.\u00a0<\/span><\/p>\n

Some of the configurations that will help to achieve this are:\u00a0<\/span><\/p>\n