ElastiCache replication group not encrypted at transit

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Metadata

Id: terraform-aws-elasticache-replication-group-not-encrypted-at-transit

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Encryption

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Description

When transit_encryption_enabled is not set to true in the aws_elasticache_replication_group resource, data transmitted between ElastiCache nodes is not encrypted, increasing the risk of data interception or unauthorized access while data is in motion. Without encryption in transit, sensitive information can be exposed to attackers with network access, potentially leading to data breaches. Enabling transit encryption ensures all traffic between nodes is protected, safeguarding against eavesdropping and man-in-the-middle attacks.

Compliant Code Examples

resource "aws_elasticache_replication_group" "example3" {
  automatic_failover_enabled    = true
  availability_zones            = ["us-west-2a", "us-west-2b"]
  replication_group_id          = "tf-rep-group-1"
  replication_group_description = "test description"
  node_type                     = "cache.m4.large"
  number_cache_clusters         = 2
  port                          = 6379
  at_rest_encryption_enabled    = true
  transit_encryption_enabled    = true
}

Non-Compliant Code Examples

resource "aws_elasticache_replication_group" "example" {
  automatic_failover_enabled    = true
  availability_zones            = ["us-west-2a", "us-west-2b"]
  replication_group_id          = "tf-rep-group-1"
  replication_group_description = "test description"
  node_type                     = "cache.m4.large"
  number_cache_clusters         = 2
  port                          = 6379
}

resource "aws_elasticache_replication_group" "example" {
  automatic_failover_enabled    = true
  availability_zones            = ["us-west-2a", "us-west-2b"]
  replication_group_id          = "tf-rep-group-1"
  replication_group_description = "test description"
  node_type                     = "cache.m4.large"
  number_cache_clusters         = 2
  port                          = 6379
  transit_encryption_enabled    = false
}