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DAX Cluster and tables should always encrypt data at rest

Default Severity: high

Explanation

Amazon DynamoDB Accelerator (DAX) and table encryption at rest provides an additional layer of data protection by helping secure your data from unauthorized access to the underlying storage.

Possible Impact

Data can be freely read if compromised

Suggested Resolution

Enable encryption at rest for DAX Cluster

Insecure Example

The following example will fail the aws-dynamodb-enable-at-rest-encryption check. 

 resource "aws_dax_cluster" "bad_example" {
    // no server side encryption at all
 }

 resource "aws_dax_cluster" "bad_example" {
    // other DAX config

    server_side_encryption {
        // empty server side encryption config
    }
 }

 resource "aws_dax_cluster" "bad_example" {
    // other DAX config

    server_side_encryption {
        enabled = false // disabled server side encryption
    }
 }

Secure Example

The following example will pass the aws-dynamodb-enable-at-rest-encryption check. 

 resource "aws_dax_cluster" "good_example" {
    // other DAX config

    server_side_encryption {
        enabled = true // enabled server side encryption
    }
 }