Volume mount with OS directory write permissions

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Metadata

Id: a62a99d1-8196-432f-8f80-3c100b05d62a

Cloud Provider: Kubernetes

Platform: Terraform

Severity: High

Category: Resource Management

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Description

Containers can mount sensitive host folders, which may grant dangerous access to critical host configurations and binaries. This rule inspects container and init_container entries in the resource spec and evaluates each volume_mount (object or array) whose mount_path targets host-sensitive directories or /. The rule enforces that the read_only attribute is set to true. It reports a MissingAttribute if read_only is undefined, and an IncorrectValue if it is explicitly set to false. To remediate, add read_only = true when missing or replace false with true for incorrect values.

Compliant Code Examples

resource "kubernetes_pod" "testttt" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/etc/config"
        read_only  = true
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

Non-Compliant Code Examples

resource "kubernetes_pod" "test2" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/bin"
        read_only = false
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

resource "kubernetes_pod" "test3" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount = [
        {
          name       = "config-volume"
          mount_path = "/bin"
          read_only = false
        }

      ]

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

resource "kubernetes_pod" "test" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/bin"
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}