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# AWS EKS cluster security group overly permissive to all traffic misconfiguration detected in code

## Rule Details

|                        |                                      |
| ---------------------- | ------------------------------------ |
| Cortex AppSec Rule ID  | APPSEC\_AWS\_38                      |
| Category - Subcategory | Kubernetes - Access Control          |
| Provider               | AWS                                  |
| Severity               | LOW                                  |
| Framework              | Terraform, Terraform Plan            |
| Mapped CSPM/KSPM Rule  | 03c96719-f7cf-4c98-8b51-04098e035bdb |

## Impact

Amazon EKS creates an endpoint for any managed Kubernetes API server to communicate with the cluster. By default, this API server endpoint is public to the internet. Access to it should be regulated using AWS IAM and native Kubernetes RBAC. We recommend that your Kubernetes API server remains private so that all communication between worker nodes and APIs stays within your VPC. If public access is needed, at a minimum, restrict the IP addresses that can access your API server from the internet to reduce the potential attack surface. Ensure your Amazon EKS public endpoint is not accessible to 0.0.0.0/0.

## How to Fix

*Resource:* aws\_eks\_cluster

* *Argument:* endpoint\_public\_access, public\_access\_cidrs ##Option 1

## \[source,go]

resource "aws\_eks\_cluster" "disabled" { name = "example" role\_arn = "aws\_iam\_role.arn"

vpc\_config { subnet\_ids = \["subnet-12345"]

endpoint\_public\_access = False }

\##Option 2: resource "aws\_eks\_cluster" "restricted" { name = "example" role\_arn = "aws\_iam\_role.arn"

vpc\_config { subnet\_ids = \["subnet-12345"]

## public\_access\_cidrs = \["10.0.0.0/16"] } } }


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