CMK rotation disabled

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Metadata

Id: terraform-aws-cmk-rotation-disabled

Provider: AWS

Platform: Terraform

Severity: Low

Category: Observability

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Description

Customer Master Keys (CMKs) created using AWS Key Management Service (KMS) should have automatic key rotation enabled to enhance cryptographic security. Failing to set the enable_key_rotation attribute to true may increase the risk of key compromise, as cryptographic keys used over extended periods are more susceptible to brute-force or other attacks. Enabling rotation ensures the key material is automatically replaced annually, reducing exposure and supporting compliance with security best practices.

resource "aws_kms_key" "example" {
  description         = "KMS key with rotation enabled"
  is_enabled          = true
  enable_key_rotation = true
}

Compliant Code Examples

resource "aws_kms_key" "negative1" {
  description         = "KMS key 1"
  is_enabled          = true
  enable_key_rotation = true
}

resource "aws_kms_key" "negative2" {
  description              = "KMS key 2"
  customer_master_key_spec = "RSA_4096"
}

resource "aws_kms_key" "negative3" {
  description              = "KMS key 3"
  customer_master_key_spec = "RSA_2048"
}

Non-Compliant Code Examples

resource "aws_kms_key" "positive1" {
  description = "KMS key 1"
}

resource "aws_kms_key" "positive2" {
  description         = "KMS key 2"
  is_enabled          = true
  enable_key_rotation = false
}

resource "aws_kms_key" "positive3" {
  description              = "KMS key 3"
  is_enabled               = true
  customer_master_key_spec = "SYMMETRIC_DEFAULT"
  enable_key_rotation      = false
}