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EFS not encrypted

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Metadata

Id: cloudformation-aws-efs-not-encrypted

Provider: AWS

Platform: CloudFormation

Severity: High

Category: Encryption

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Description

Amazon EFS file systems must have encryption enabled to protect data at rest. Without encryption, file data, backups, and snapshots can be exposed if storage media or underlying infrastructure is compromised.

For AWS::EFS::FileSystem resources, the Properties.Encrypted property must be set to true. This rule flags resources with Encrypted set to false. To ensure encryption is always applied, explicitly set Encrypted to true and optionally specify KmsKeyId to use a customer-managed AWS KMS key.

Secure configuration example:

MyEFS:
  Type: AWS::EFS::FileSystem
  Properties:
    Encrypted: true
    KmsKeyId: arn:aws:kms:us-east-1:123456789012:key/abcd-ef01-2345-6789

Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: "Create EFS system and Mount Targets for test VPC"
Parameters:
    VPC:
        Type: String
        Description: The VPC identity
        Default: vpc-ID
    SubnetID1:
        Type: String
        Description: The subnet where to launch the service
        Default: subnet-ID
    SubnetID2:
        Type: String
        Description: the subnet where to Launch the service
        Default: subnet-ID
    SubnetID3:
        Type: String
        Description: The subnet where to launch the service
        Default: subnet-ID
    SubnetID4:
        Type: String
        Description: the subnet where to Launch the service
        Default: subnet-ID
Resources:
    EFSSecurityGroup:
        Type: "AWS::EC2::SecurityGroup"
        Properties:
            GroupDescription: "security group for the prod EFS"
            GroupName: "test-EFS-SG"
            VpcId: !Ref VPC
            SecurityGroupIngress:
              - SourceSecurityGroupId: sg-ID
                Description: "servers to connect to efs"
                FromPort: 2049
                IpProtocol: "tcp"
                ToPort: 2049
            Tags:
              - Key: Environment
                Value: prod
              - Key: Name
                Value: test-VPC-EFS-SG
              - Key: Project
                Value: ITEngineering
    EFSFileSystem:
        Type: AWS::EFS::FileSystem
        Properties:
            BackupPolicy:
              Status: ENABLED
            Encrypted: true
            LifecyclePolicies:
              - TransitionToIA: AFTER_60_DAYS
            PerformanceMode: generalPurpose
            ThroughputMode: bursting
            FileSystemTags:
              - Key: Environment
                Value: prod
              - Key: Name
                Value: test-VPC-EFS
              - Key: Project
                Value: ITEngineering
    MountTarget1:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID1
    MountTarget2:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID2
    MountTarget3:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID3
    MountTarget4:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID4
Outputs:
  EFS:
    Description: The created EFS
    Value: !Ref EFSFileSystem
  EFSMountTarget1:
    Description: The EFS MountTarget1
    Value: !Ref MountTarget1
  EFSMountTarget2:
    Description: The EFS MountTarget2
    Value: !Ref MountTarget2
  EFSMountTarget3:
    Description: The EFS MountTarget3
    Value: !Ref MountTarget3
  EFSMountTarget4:
    Description: The EFS MountTarget4
    Value: !Ref MountTarget4

Non-Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: "Create EFS system and Mount Targets for test VPC"
Parameters:
    VPC:
        Type: String
        Description: The VPC identity
        Default: vpc-ID
    SubnetID1:
        Type: String
        Description: The subnet where to launch the service
        Default: subnet-ID
    SubnetID2:
        Type: String
        Description: the subnet where to Launch the service
        Default: subnet-ID
    SubnetID3:
        Type: String
        Description: The subnet where to launch the service
        Default: subnet-ID
    SubnetID4:
        Type: String
        Description: the subnet where to Launch the service
        Default: subnet-ID
Resources:
    EFSSecurityGroup:
        Type: "AWS::EC2::SecurityGroup"
        Properties:
            GroupDescription: "security group for the prod EFS"
            GroupName: "test-EFS-SG"
            VpcId: !Ref VPC
            SecurityGroupIngress:
              - SourceSecurityGroupId: sg-ID
                Description: "servers to connect to efs"
                FromPort: 2049
                IpProtocol: "tcp"
                ToPort: 2049
            Tags:
              - Key: Environment
                Value: prod
              - Key: Name
                Value: test-VPC-EFS-SG
              - Key: Project
                Value: ITEngineering
    EFSFileSystem01:
        Type: AWS::EFS::FileSystem
        Properties:
            BackupPolicy:
              Status: ENABLED
            Encrypted: false
            LifecyclePolicies:
              - TransitionToIA: AFTER_60_DAYS
            PerformanceMode: generalPurpose
            ThroughputMode: bursting
            FileSystemTags:
              - Key: Environment
                Value: prod
              - Key: Name
                Value: test-VPC-EFS
              - Key: Project
                Value: ITEngineering
    MountTarget1:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem01
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID1
    MountTarget2:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem01
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID2
    MountTarget3:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem01
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID3
    MountTarget4:
        Type: AWS::EFS::MountTarget
        Properties:
            FileSystemId: !Ref EFSFileSystem01
            IpAddress: "*.*.*.*"
            SecurityGroups:
              - !Ref EFSSecurityGroup
            SubnetId: !Ref SubnetID4
Outputs:
  EFS:
    Description: The created EFS
    Value: !Ref EFSFileSystem01
  EFSMountTarget1:
    Description: The EFS MountTarget1
    Value: !Ref MountTarget1
  EFSMountTarget2:
    Description: The EFS MountTarget2
    Value: !Ref MountTarget2
  EFSMountTarget3:
    Description: The EFS MountTarget3
    Value: !Ref MountTarget3
  EFSMountTarget4:
    Description: The EFS MountTarget4
    Value: !Ref MountTarget4