Resource pulls latest AMI images without a filter.

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Metadata

ID: terraform-aws/ami-missing-owners

Language: Terraform

Severity: Error

Category: Security

Description

This error is caused when most_recent is set to true and there is no owner attribute set or no owner or image filters. With this configuration, a third party may introduce a new image which will be returned by this data source, leading to unexpected changes.

Consider adding a owner attribute, or filtering by owner-alias, owner-id, or image-id to avoid this possibility.

Non-Compliant Code Examples

# non-compliant
data "aws_ami" "ubuntu" {
  most_recent = true

  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
}

# compliant
data "aws_ami" "ubuntu" {
  most_recent = true
  owners      = ["099720109477"] // Canonical
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
}

# compliant
data "aws_ami" "ubuntu" {
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-1234"]
  }
}

# compliant
data "aws_ami" "ubuntu" {
  most_recent = true
  filter {
    name   = "image-id"
    values = ["ami-12345"]
  }
}

data "aws_ami" "ubuntu" {
  most_recent = true

  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
}

Compliant Code Examples

data "aws_ami" "ubuntu" {
  most_recent = true
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
  filter {
    name   = "owner-id"
    values = ["099720109477"]
  }
}

data "aws_ami" "ubuntu" {
  most_recent = true
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
  filter {
    name   = "owner-alias"
    values = ["amazon"]
  }
}

data "aws_ami" "ubuntu" {
  most_recent = true
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
  owners = ["099720109477"] // Canonical
}

data "aws_ami" "ubuntu" {
  most_recent = true
  filter {
    name   = "image-id"
    values = ["ami-12345"]
  }
}

data "aws_ami" "ubuntu" {
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-1234"]
  }
}

data "aws_ami" "ubuntu" {
  most_recent = true
  owners      = ["099720109477"] // Canonical
  filter {
    name   = "name"
    values = ["ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"]
  }
}