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If so, select your organization under the “Clusters” view (in this tutorial, my organization is “Tanzu Mission Control Demo”) and then click “Create Custom Policy.” For this CVE, you may want to apply the policy to all the clusters in your organization. You are now ready to assign custom policy to your clusters.
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HOW TO USE NESSUS+TUTORIAL HOW TO
We will now demonstrate, step by step, how to apply this custom policy in Tanzu Mission Control.įirst, in Tanzu Mission Control, click the “Assignments” tab in the left navigation, under the “Policies” section, then click the “Custom” tab. The custom policy template we are using here to mitigate CVE-2020-8554 will prohibit the addition of spec.externalIPs and spec.loadBalancerIP fields in the service resource while also giving users a way to add only those IP addresses that they’ve deemed to be allowable. For example, if you want some of your Kubernetes resources to define a label “env: dev”, “env: staging”, or “env : prod”, depending on the environment the resource is being created in, the policy template will define this rule of admission as well as the key and value pairs it expects for successful pod definition. This declarative definition is written in a syntax called Rego, the underlying language supported by the Open Policy Agent framework. Apply custom policies in Tanzu Mission ControlĪ custom policy template in Tanzu Mission Control is a declarative definition of the policy you want to enforce on your cluster fleet. In this tutorial, we will demonstrate how to use a custom policy in Tanzu Mission Control to quickly enforce a policy across your cluster fleet, prohibiting the creation of service resources that expose workloads to external IP addresses.
HOW TO USE NESSUS+TUTORIAL PATCH
There is no patch for this issue yet, and it can currently only be mitigated by restricting access to the vulnerable features. The upstream Kubernetes community recently discovered a security issue- CVE-2020-8554- affecting multitenant clusters that allows anyone who is able to create a ClusterIP service and set the spec.externalIPs field to intercept traffic to that IP address.
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