ElastiCache for Redis replication groups should be encrypted in transit¶

This control checks if ElastiCache for Redis replication groups are encrypted in transit. This control fails if an ElastiCache for Redis replication group isn't encrypted in transit.

How to fix¶

Attribute transit_encryption_enabled of aws_elasticache_replication_group must be true.

Implementation options¶

Choose the option that matches how you manage Terraform. All options satisfy this control.

Option 1: Compliance.tf module (recommended)¶

Use the compliance.tf registry module to get this control enforced by default. This control is mapped to the frameworks shown in the tabs above. To begin, see get started with compliance.tf.

PCI DSS v4.0

module "elasticache" {
  source  = "pcidss.compliance.tf/terraform-aws-modules/elasticache/aws"
  version = ">=1.0.0,<2.0.0"

  description          = "Redis cluster"
  engine               = "redis"
  engine_version       = "7.1"
  node_type            = "cache.t3.micro"
  num_cache_clusters   = 2
  replication_group_id = "abc123"
  subnet_ids           = []
  vpc_id               = ""
}

Option 2: Open source module (`terraform-aws-modules`)¶

If you use terraform-aws-modules/elasticache/aws, configure the required module inputs to satisfy this control. You can later migrate to the compliance.tf module with minimal changes because it is compatible by design.

module "elasticache" {
  source  = "terraform-aws-modules/elasticache/aws"
  version = ">=1.0.0,<2.0.0"

  description          = "Redis cluster"
  engine               = "redis"
  engine_version       = "7.1"
  node_type            = "cache.t3.micro"
  num_cache_clusters   = 2
  replication_group_id = "abc123"
  subnet_ids           = []
  vpc_id               = ""

  transit_encryption_enabled = true
}

Option 3: Terraform AWS provider resources¶

If you manage resources directly, configure the relevant Terraform AWS provider resources to meet this control. See docs for the resources involved: aws_elasticache_replication_group.

resource "aws_elasticache_replication_group" "this" {
  at_rest_encryption_enabled = true
  auth_token                 = "PofixExampleAuthToken32CharsLng"
  description                = "pofix example replication group"
  replication_group_id       = "pofix-example"
  snapshot_retention_limit   = 15

  transit_encryption_enabled = true
}

Which option should I choose?

Compliance.tf module (recommended): controls enforced by default and mapped to frameworks.
Open source module (terraform-aws-modules): compatible by design with compliance.tf. Same variable names for an easy, low-change migration path when you are ready.
Terraform AWS provider resources: manage Terraform resources directly.

Tool mappings¶

Use these identifiers to cross-reference this control across tools, reports, and evidence.

Compliance.tf (CTF) Control: elasticache_replication_group_encryption_in_transit_enabled
AWS Config Managed Rule: ELASTICACHE_REPL_GRP_ENCRYPTED_IN_TRANSIT
Checkov Check: CKV_AWS_30
Powerpipe Control: aws_compliance.control.elasticache_replication_group_encryption_in_transit_enabled