terraform.lang.security.eks-public-endpoint-enabled.eks-public-endpoint-enabled

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The vpc_config resource inside the eks cluster has not explicitly disabled public endpoint access

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Defintion

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rules:
  - id: eks-public-endpoint-enabled
    patterns:
      - pattern: |
          resource
      - pattern-inside: |
          resource "aws_eks_cluster" "..." {...}
      - pattern-not-inside: |
          resource "aws_eks_cluster" "..."{
            ...
            vpc_config{
              ...
              endpoint_public_access = false
              ...
            }
            ...
          }
    languages:
      - hcl
    message: The vpc_config resource inside the eks cluster has not explicitly
      disabled public endpoint access
    severity: WARNING
    metadata:
      category: security
      cwe:
        - "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"
      technology:
        - terraform
        - aws
      owasp:
        - A01:2021 - Broken Access Control
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Mishandled Sensitive Information

Examples

eks-public-endpoint-enabled.tf

# ruleid: eks-public-endpoint-enabled
resource "aws_eks_cluster" "example" {
  name     = "example"
  role_arn = aws_iam_role.example.arn
  vpc_config {
    subnet_ids = [aws_subnet.example1.id, aws_subnet.example2.id]
  }

}

# ruleid: eks-public-endpoint-enabled
resource "aws_eks_cluster" "example" {
  name     = "example"
  role_arn = aws_iam_role.example.arn
}

resource "aws_eks_cluster" "example" {
  name     = "example"
  role_arn = aws_iam_role.example.arn

  vpc_config {
    endpoint_public_access = false
    subnet_ids = [aws_subnet.example1.id, aws_subnet.example2.id]
  }
}