Root Containers Admitted

• Query id: 4c415497-7410-4559-90e8-f2c8ac64ee38
• Query name: Root Containers Admitted
• Platform: Terraform
• Severity: Medium
• Category: Best Practices
• URL: Github

Description

Containers must not be allowed to run with root privileges, which means the attributes 'privileged' and 'allow_privilege_escalation' must be set to false, 'run_as_user.rule' must be set to 'MustRunAsNonRoot', and adding the root group must be forbidden
Documentation

Code samples

Code samples with security vulnerabilities

Postitive test num. 1 - tf file

resource "kubernetes_pod_security_policy" "example" {
  metadata {
    name = "terraform-example"
  }
  spec {
    privileged                 = true
    allow_privilege_escalation = true

    volumes = [
      "configMap",
      "emptyDir",
      "projected",
      "secret",
      "downwardAPI",
      "persistentVolumeClaim",
    ]

    run_as_user {
      rule = "RunAsAny"
    }

    se_linux {
      rule = "RunAsAny"
    }

    supplemental_groups {
      rule = "RunAsAny"
      range {
        min = 1
        max = 65535
      }
    }

    fs_group {
      rule = "MustRunAs"
      range {
        min = 0
        max = 65535
      }
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "kubernetes_pod_security_policy" "example2" {
  metadata {
    name = "terraform-example"
  }
  spec {
    privileged                 = false
    allow_privilege_escalation = false

    volumes = [
      "configMap",
      "emptyDir",
      "projected",
      "secret",
      "downwardAPI",
      "persistentVolumeClaim",
    ]

    run_as_user {
      rule = "MustRunAsNonRoot"
    }

    se_linux {
      rule = "RunAsAny"
    }

    supplemental_groups {
      rule = "MustRunAs"
      range {
        min = 1
        max = 65535
      }
    }

    fs_group {
      rule = "MustRunAs"
      range {
        min = 1
        max = 65535
      }
    }

    read_only_root_filesystem = true
  }
}