Containers with sys admin capabilities

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Metadata

Id: terraform-kubernetes-containers-with-sys-admin-capabilities

Provider: Kubernetes

Platform: Terraform

Severity: High

Category: Insecure Configurations

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Description

Containers should not include the CAP_SYS_ADMIN Linux capability. Granting CAP_SYS_ADMIN gives processes elevated system-administration privileges and can enable container escape or host compromise. Container security contexts must not add ‘SYS_ADMIN’ to capabilities.

Compliant Code Examples


resource "kubernetes_pod" "negative3" {
  metadata {
    name = "terraform-example"
  }

  spec {

    container =  [
      {
        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
        }
      },

      {
        image = "nginx:1.7.9"
        name  = "example2"

        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" "negative4" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      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" "positive1" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container = [
     {
      image = "nginx:1.7.9"
      name  = "example22"

      security_context = {
        capabilities = {
          add = ["SYS_ADMIN"]
        }
      }

      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
      }
     }
     ,
     {
      image = "nginx:1.7.9"
      name  = "example22222"

       security_context = {
        capabilities = {
          add = ["SYS_ADMIN"]
        }
      }

      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" "positive2" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      image = "nginx:1.7.9"
      name  = "example"

      security_context {
        capabilities {
          add = ["SYS_ADMIN"]
        }
      }

      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"
  }
}