Permissive access to create pods

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Metadata

Id: 522d4a64-4dc9-44bd-9240-7d8a0d5cb5ba

Cloud Provider: Kubernetes

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

The permission to create pods in a cluster should be restricted because it allows privilege escalation. This rule inspects kubernetes_role and kubernetes_cluster_role resources and reports when a rule’s verbs contains create while its resources contains pods or a wildcard value. It also flags cases where verbs or resources contain a wildcard (for example, *) in combination with pods, since those broaden access and can enable pod creation. Restricting these permissions reduces the risk of workloads obtaining elevated privileges.

Compliant Code Examples

resource "kubernetes_cluster_role" "example" {
  metadata {
    name = "terraform-example"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "pods"]
    verbs      = ["get", "list", "watch"]
  }
}

resource "kubernetes_role" "example" {
  metadata {
    name = "terraform-example"
    labels = {
      test = "MyRole"
    }
  }

  rule {
    api_groups     = [""]
    resources      = ["pods"]
    resource_names = ["foo"]
    verbs          = ["get", "list", "watch"]
  }
  rule {
    api_groups = ["apps"]
    resources  = ["deployments"]
    verbs      = ["get", "list"]
  }
}

Non-Compliant Code Examples

resource "kubernetes_cluster_role" "example1" {
  metadata {
    name = "terraform-example1"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "pods"]
    verbs      = ["create", "list", "watch"]
  }
}

resource "kubernetes_cluster_role" "example2" {
  metadata {
    name = "terraform-example2"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "*"]
    verbs      = ["create", "list", "watch"]
  }
}

resource "kubernetes_cluster_role" "example3" {
  metadata {
    name = "terraform-example3"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "*"]
    verbs      = ["*", "list", "watch"]
  }
}

resource "kubernetes_cluster_role" "example4" {
  metadata {
    name = "terraform-example4"
  }

  rule {
    api_groups = [""]
    resources  = ["namespaces", "pods"]
    verbs      = ["*", "list", "watch"]
  }
}

resource "kubernetes_role" "example1" {
  metadata {
    name = "terraform-example1"
    labels = {
      test = "MyRole"
    }
  }

  rule {
    api_groups     = [""]
    resources      = ["pods"]
    resource_names = ["foo"]
    verbs          = ["create", "list", "watch"]
  }

  rule {
    api_groups = ["apps"]
    resources  = ["deployments"]
    verbs      = ["get", "list"]
  }
}

resource "kubernetes_role" "example2" {
  metadata {
    name = "terraform-example2"
    labels = {
      test = "MyRole"
    }
  }

  rule {
    api_groups     = [""]
    resources      = ["*"]
    resource_names = ["foo"]
    verbs          = ["create", "list", "watch"]
  }
}

resource "kubernetes_role" "example3" {
  metadata {
    name = "terraform-example3"
    labels = {
      test = "MyRole"
    }
  }

  rule {
    api_groups     = [""]
    resources      = ["pods"]
    resource_names = ["foo"]
    verbs          = ["*", "list", "watch"]
  }
}

resource "kubernetes_role" "example4" {
  metadata {
    name = "terraform-example4"
    labels = {
      test = "MyRole"
    }
  }

  rule {
    api_groups     = [""]
    resources      = ["*"]
    resource_names = ["foo"]
    verbs          = ["*", "list", "watch"]
  }
}