RDS Storage Not Encrypted

• Query id: 5beacce3-4020-4a3d-9e1d-a36f953df630
• Query name: RDS Storage Not Encrypted
• Platform: CloudFormation
• Severity: High
• Category: Encryption
• CWE: 312
• URL: Github

Description

RDS Storage should be encrypted, which means the attribute 'StorageEncrypted' should be set to 'true'
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

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

Positive test num. 2 - yaml file

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

Positive test num. 3 - json file

{
  "AWSTemplateFormatVersion": "2010-09-09T00:00:00Z",
  "Description": "RDS Storage Encrypted",
  "Parameters": {
    "SourceDBInstanceIdentifier": {
      "Type": "String"
    },
    "DBInstanceType": {
      "Type": "String"
    },
    "SourceRegion": {
      "Type": "String"
    }
  },
  "Resources": {
    "MyKey": {
      "Type": "AWS::KMS::Key",
      "Properties": {
        "KeyPolicy": {
          "Version": "2012-10-17T00:00:00Z",
          "Id": "key-default-1",
          "Statement": [
            {
              "Sid": "Enable IAM User Permissions",
              "Effect": "Allow",
              "Principal": {
                "AWS": [
                  "",
                  [
                    "arn:aws:iam::",
                    "AWS::AccountId",
                    ":root"
                  ]
                ]
              },
              "Action": "kms:*",
              "Resource": "*"
            }
          ]
        }
      }
    },
    "MyDBSmall": {
      "Type": "AWS::RDS::DBInstance",
      "Properties": {
        "DBInstanceClass": "DBInstanceType",
        "SourceDBInstanceIdentifier": "SourceDBInstanceIdentifier",
        "SourceRegion": "SourceRegion",
        "KmsKeyId": "MyKey",
        "StorageEncrypted": false
      }
    }
  }
}

Positive test num. 4 - json file

{
  "AWSTemplateFormatVersion": "2010-09-11T00:00:00Z",
  "Description": "RDS Storage Encrypted2",
  "Parameters": {
    "SourceDBInstanceIdentifier": {
      "Type": "String"
    },
    "DBInstanceType": {
      "Type": "String"
    },
    "SourceRegion": {
      "Type": "String"
    }
  },
  "Resources": {
    "MyKey2": {
      "Type": "AWS::KMS::Key",
      "Properties": {
        "KeyPolicy": {
          "Statement": [
            {
              "Action": "kms:*",
              "Resource": "*",
              "Sid": "Enable IAM User Permissions",
              "Effect": "Allow",
              "Principal": {
                "AWS": [
                  "",
                  [
                    "arn:aws:iam::",
                    "AWS::AccountId",
                    ":root"
                  ]
                ]
              }
            }
          ],
          "Version": "2012-10-17T00:00:00Z",
          "Id": "key-default-1"
        }
      }
    },
    "MyDBSmall2": {
      "Type": "AWS::RDS::DBInstance",
      "Properties": {
        "SourceRegion": "SourceRegion",
        "KmsKeyId": "MyKey",
        "DBInstanceClass": "DBInstanceType",
        "SourceDBInstanceIdentifier": "SourceDBInstanceIdentifier"
      }
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

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

Negative test num. 2 - json file

{
  "Description": "RDS Storage Encrypted",
  "Parameters": {
    "SourceRegion": {
      "Type": "String"
    },
    "SourceDBInstanceIdentifier": {
      "Type": "String"
    },
    "DBInstanceType": {
      "Type": "String"
    }
  },
  "Resources": {
    "MyDBSmall": {
      "Type": "AWS::RDS::DBInstance",
      "Properties": {
        "SourceDBInstanceIdentifier": "SourceDBInstanceIdentifier",
        "SourceRegion": "SourceRegion",
        "KmsKeyId": "MyKey",
        "StorageEncrypted": true,
        "DBInstanceClass": "DBInstanceType"
      }
    },
    "MyKey": {
      "Type": "AWS::KMS::Key",
      "Properties": {
        "KeyPolicy": {
          "Version": "2012-10-17T00:00:00Z",
          "Id": "key-default-1",
          "Statement": [
            {
              "Sid": "Enable IAM User Permissions",
              "Effect": "Allow",
              "Principal": {
                "AWS": [
                  "",
                  [
                    "arn:aws:iam::",
                    "AWS::AccountId",
                    ":root"
                  ]
                ]
              },
              "Action": "kms:*",
              "Resource": "*"
            }
          ]
        }
      }
    }
  },
  "AWSTemplateFormatVersion": "2010-09-09T00:00:00Z"
}