CVM instance using default security group

Docs > Datadog Security > Code Security > Infrastructure as Code (IaC) Security > IaC Security Rules > CVM instance using default security group

Metadata

Id: terraform-tencentcloud-cvm-instance-using-default-security-group

Cloud Provider: TencentCloud

Platform: Terraform

Severity: Low

Category: Access Control

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Provider Reference

Description

CVM instances (tencentcloud_instance) should not include the default security group. This rule inspects the orderly_security_groups and security_groups attributes for any occurrence of default and flags the resource if found. Relying on the default security group can result in overly permissive network access and should be avoided.

Compliant Code Examples

resource "tencentcloud_security_group" "sg" {
  name        = "tf-example"
  description = "test"
}

resource "tencentcloud_instance" "cvm_postpaid" {
  instance_name     = "cvm_postpaid"
  availability_zone = "ap-guangzhou-7"
  image_id          = "img-9qrfy1xt"
  instance_type     = "POSTPAID_BY_HOUR"
  system_disk_type  = "CLOUD_PREMIUM"
  system_disk_size  = 50
  hostname          = "root"
  project_id        = 0
  vpc_id            = "vpc-axrsmmrv"
  subnet_id         = "subnet-861wd75e"

  security_groups = [
    tencentcloud_security_group.sg.id
  ]

  data_disks {
    data_disk_type = "CLOUD_PREMIUM"
    data_disk_size = 50
    encrypt        = false
  }

  tags = {
    tagKey = "tagValue"
  }
}

resource "tencentcloud_security_group" "sg" {
  name        = "tf-example"
  description = "test"
}

resource "tencentcloud_instance" "cvm_postpaid" {
  instance_name     = "cvm_postpaid"
  availability_zone = "ap-guangzhou-7"
  image_id          = "img-9qrfy1xt"
  instance_type     = "POSTPAID_BY_HOUR"
  system_disk_type  = "CLOUD_PREMIUM"
  system_disk_size  = 50
  hostname          = "root"
  project_id        = 0
  vpc_id            = "vpc-axrsmmrv"
  subnet_id         = "subnet-861wd75e"

  orderly_security_groups = [
    tencentcloud_security_group.sg.id
  ]

  data_disks {
    data_disk_type = "CLOUD_PREMIUM"
    data_disk_size = 50
    encrypt        = false
  }

  tags = {
    tagKey = "tagValue"
  }
}

Non-Compliant Code Examples

resource "tencentcloud_security_group" "default" {
  name        = "tf-example"
  description = "test"
}

resource "tencentcloud_instance" "cvm_postpaid" {
  instance_name     = "cvm_postpaid"
  availability_zone = "ap-guangzhou-7"
  image_id          = "img-9qrfy1xt"
  instance_type     = "POSTPAID_BY_HOUR"
  system_disk_type  = "CLOUD_PREMIUM"
  system_disk_size  = 50
  hostname          = "root"
  project_id        = 0
  vpc_id            = "vpc-axrsmmrv"
  subnet_id         = "subnet-861wd75e"

  security_groups = [tencentcloud_security_group.default.id]

  data_disks {
    data_disk_type = "CLOUD_PREMIUM"
    data_disk_size = 50
    encrypt        = false
  }

  tags = {
    tagKey = "tagValue"
  }
}

resource "tencentcloud_security_group" "default" {
  name        = "tf-example"
  description = "test"
}

resource "tencentcloud_instance" "cvm_postpaid" {
  instance_name     = "cvm_postpaid"
  availability_zone = "ap-guangzhou-7"
  image_id          = "img-9qrfy1xt"
  instance_type     = "POSTPAID_BY_HOUR"
  system_disk_type  = "CLOUD_PREMIUM"
  system_disk_size  = 50
  hostname          = "root"
  project_id        = 0
  vpc_id            = "vpc-axrsmmrv"
  subnet_id         = "subnet-861wd75e"

  orderly_security_groups = [tencentcloud_security_group.default.id]

  data_disks {
    data_disk_type = "CLOUD_PREMIUM"
    data_disk_size = 50
    encrypt        = false
  }

  tags = {
    tagKey = "tagValue"
  }
}