> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/compute/appsec-k8s-1.md).

# Containers wishing to share host process ID namespace admitted misconfiguration detected in code

## Rule Details

|                        |                                                        |
| ---------------------- | ------------------------------------------------------ |
| Cortex AppSec Rule ID  | APPSEC\_K8S\_1                                         |
| Category - Subcategory | Kubernetes - Access Control                            |
| Provider               | OTHER                                                  |
| Severity               | MEDIUM                                                 |
| Framework              | Helm, Kubernetes, Kustomize, Terraform, Terraform Plan |

## Impact

When process namespace sharing is enabled, processes in a container are visible to all other containers in that pod. This feature can enable configuring cooperating containers that do not include debugging tools, such as a logger sidecar container or troubleshooting container images. Sharing the host process ID namespace breaks the isolation between container images and can make processes visible to other containers in the pod. This includes all information in the */proc* directory, which can sometimes include passwords or keys, passed as environment variables. We recommend you do not admit containers wishing to share the host process ID namespace.

## How to Fix

*Resource:* PodSecurityPolicy

* *Arguments:* hostPID (Optional) When set to false, Pod are unable to use their host's PID namespace.

To use a **PodSecurityPolicy** resource the requesting user or target pod's service account must be authorized to use the policy. The preferred method is to grant access to the service account.

In the following example we use **RBAC**, a standard Kubernetes authorization mode.

## A *Role* or *ClusterRole* must grant access to *use* the desired policies \[source,go]

*Kind*: ClusterRole

The **ClusterRole** is then bound to the authorized service(s):

*Kind*: ClusterRoleBinding apiVersion: policy/v1beta1 kind: PodSecurityPolicy metadata: name: spec:

* hostPID: false

***

apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: rules:

* apiGroups: \['policy'] resources: \['podsecuritypolicies'] verbs: \['use'] resourceNames:
*

***

apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: roleRef: kind: ClusterRole name: apiGroup: rbac.authorization.k8s.io subjects:

* kind: ServiceAccount name: namespace:

***


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