Non-encrypted confidential information - EFS
Description
The AWS Elastic File System (EFS) service is encrypted with a default KMS key. Best practices recommend encrypting EFS instances using Customer Managed Keys (CMKs) to reduce risk of exposure and give full control of encrypted information.
Impact
Obtain confidential information from file system
Recommendation
Enable the EFS encryption using a KMS Customer Managed Key (CMK)
Threat
Anonymous attacker with local access to one or more EFS instances
Expected Remediation Time
⌚ 20 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the vulnerability.
Base
- Attack vector: N
- Attack complexity: H
- Privileges required: N
- User interaction: N
- Scope: U
- Confidentiality: L
- Integrity: N
- Availability: N
Temporal
- Exploit code madurity: P
- Remediation level: O
- Report confidence: C
Result
- Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
- Score:
- Base: 3.7
- Temporal: 3.4
- Severity:
- Base: Low
- Temporal: Low
Code Examples
Compliant code
The resource has encryption correctly configured with a KMS Key
Resources:
FileSystemResource:
Type: 'AWS::EFS::FileSystem'
Properties:
AvailabilityZoneName: us-east-1a
BackupPolicy:
Status: ENABLED
Encrypted: true
KMS_Key: ${encrypted_key}
Non compliant code
The resource does not have encryption correctly set up
Resources:
FileSystemResource:
Type: 'AWS::EFS::FileSystem'
Properties:
AvailabilityZoneName: us-east-1a
BackupPolicy:
Status: ENABLED
Encrypted: false
Terraform example
resource "aws_efs_file_system" "enabled" {
creation_token = "example"
encrypted = false
}
Using the AWS CLI, the following command checks if the EFS file systems are encrypted
$ aws efs describe-file-systems
--region us-east-1
--file-system-id {fs_id}
--query 'FileSystems[*].Encrypted'
If the command output returns false, the file system is unencrypted.
Details
https://docs.bridgecrew.io/docs/bc_aws_general_104
Requirements
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