RDS storage not encrypted

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Metadata

Id: cloudformation-aws-rds-storage-not-encrypted

Provider: AWS

Platform: CloudFormation

Severity: High

Category: Encryption

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Description

RDS database instances must have storage encryption enabled to protect data at rest and to ensure snapshots and automated backups are encrypted. Without it, sensitive database contents can be exposed if storage media or backups are compromised. In AWS CloudFormation, the AWS::RDS::DBInstance resource must define the StorageEncrypted property and set it to true. Resources missing StorageEncrypted or with StorageEncrypted set to false will be flagged. Optionally set KmsKeyId to use a customer-managed KMS key when you require specific key control.

Secure configuration example:

MyDBInstance:
  Type: AWS::RDS::DBInstance
  Properties:
    DBInstanceIdentifier: my-encrypted-db
    Engine: postgres
    EngineVersion: '14.7'
    DBInstanceClass: db.t3.micro
    AllocatedStorage: 20
    MasterUsername: admin
    MasterUserPassword: !Ref DBPassword
    StorageEncrypted: true
    KmsKeyId: !Ref MyKMSKey

Compliant Code Examples

AWSTemplateFormatVersion: 2010-09-09
Description: RDS Storage Encrypted
Parameters:
  SourceDBInstanceIdentifier:
    Type: String
  DBInstanceType:
    Type: String
  SourceRegion:
    Type: String
Resources:
  MyKey:
    Type: "AWS::KMS::Key"
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ""
                - - "arn:aws:iam::"
                  - !Ref "AWS::AccountId"
                  - ":root"
            Action: "kms:*"
            Resource: "*"
  MyDBSmall:
    Type: "AWS::RDS::DBInstance"
    Properties:
      DBInstanceClass: !Ref DBInstanceType
      SourceDBInstanceIdentifier: !Ref SourceDBInstanceIdentifier
      SourceRegion: !Ref SourceRegion
      KmsKeyId: !Ref MyKey
      StorageEncrypted: true

Non-Compliant Code Examples

AWSTemplateFormatVersion: 2010-09-09
Description: RDS Storage Encrypted
Parameters:
  SourceDBInstanceIdentifier:
    Type: String
  DBInstanceType:
    Type: String
  SourceRegion:
    Type: String
Resources:
  MyKey:
    Type: "AWS::KMS::Key"
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ""
                - - "arn:aws:iam::"
                  - !Ref "AWS::AccountId"
                  - ":root"
            Action: "kms:*"
            Resource: "*"
  MyDBSmall:
    Type: "AWS::RDS::DBInstance"
    Properties:
      DBInstanceClass: !Ref DBInstanceType
      SourceDBInstanceIdentifier: !Ref SourceDBInstanceIdentifier
      SourceRegion: !Ref SourceRegion
      KmsKeyId: !Ref MyKey
      StorageEncrypted: false

AWSTemplateFormatVersion: 2010-09-11
Description: RDS Storage Encrypted2
Parameters:
  SourceDBInstanceIdentifier:
    Type: String
  DBInstanceType:
    Type: String
  SourceRegion:
    Type: String
Resources:
  MyKey2:
    Type: "AWS::KMS::Key"
    Properties:
      KeyPolicy:
        Version: 2012-10-17
        Id: key-default-1
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Join
                - ""
                - - "arn:aws:iam::"
                  - !Ref "AWS::AccountId"
                  - ":root"
            Action: "kms:*"
            Resource: "*"
  MyDBSmall2:
    Type: "AWS::RDS::DBInstance"
    Properties:
      DBInstanceClass: !Ref DBInstanceType
      SourceDBInstanceIdentifier: !Ref SourceDBInstanceIdentifier
      SourceRegion: !Ref SourceRegion
      KmsKeyId: !Ref MyKey