DAX cluster not encrypted

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Metadata

Id: f11aec39-858f-4b6f-b946-0a1bf46c0c87

Cloud Provider: aws

Framework: Terraform

Severity: High

Category: Encryption

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Description

This check verifies that AWS DynamoDB Accelerator (DAX) clusters have server-side encryption enabled to protect data at rest. Without encryption, sensitive data stored in DAX clusters could be exposed if unauthorized access to the storage media occurs, potentially leading to data breaches and compliance violations.

To secure a DAX cluster, you must include a server_side_encryption block with enabled = true, as shown below:

resource "aws_dax_cluster" "secure_example" {
  cluster_name       = "cluster-example"
  // other configuration...
  
  server_side_encryption {
    enabled = true
  }
}

Insecure configurations either omit the server_side_encryption block entirely, include an empty block, or explicitly set enabled = false.

Compliant Code Examples

resource "aws_dax_cluster" "bar" {
  cluster_name       = "cluster-example"
  iam_role_arn       = data.aws_iam_role.example.arn
  node_type          = "dax.r4.large"
  replication_factor = 1

  server_side_encryption {
    enabled = true
  }
}

Non-Compliant Code Examples

resource "aws_dax_cluster" "bar_1" {
  cluster_name       = "cluster-example"
  iam_role_arn       = data.aws_iam_role.example.arn
  node_type          = "dax.r4.large"
  replication_factor = 1
}

resource "aws_dax_cluster" "bar_2" {
  cluster_name       = "cluster-example"
  iam_role_arn       = data.aws_iam_role.example.arn
  node_type          = "dax.r4.large"
  replication_factor = 1

  server_side_encryption {
  }
}

resource "aws_dax_cluster" "bar_3" {
  cluster_name       = "cluster-example"
  iam_role_arn       = data.aws_iam_role.example.arn
  node_type          = "dax.r4.large"
  replication_factor = 1

  server_side_encryption {
    enabled = false
  }
}