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Insecure service configuration - AWS

Description​

Because of a misconfiguration in the AWS services, it is possible to identify and/or try to access resources, functionalities, network segments and ports.

Impact​

  • Identify ports, services and network segments.
  • Try to access the services found.
  • Get credentials, services and files information.

Recommendation​

Securely configure the vulnerable service to be accessed only by authorized users.

Threat​

External attacker with credentials.

Expected Remediation Time​

⌚ 45 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: L
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: L
  • Availability: N

Temporal​

  • Exploit code madurity: P
  • Remediation level: X
  • Report confidence: X

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:X/RC:X
  • Score:
    • Base: 5.4
    • Temporal: 5.1
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

All AWS sensitive resources have defined security configurations and are private

Resources:
  PrivateS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      AccessControl: Private
      BucketName: SKIMS-PRIVATE-BUCKET
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: aws:kms
              KMSMasterKeyID: KMS-KEY-ARN
    DeletionPolicy: Delete

Non compliant code​

An AWS resource is configured to be publicly accesible with editing permissions

Resources:
  S3Bucket:
    Type: AWS::S3::Bucket
    DeletionPolicy: Retain
    Properties:
      AccessControl: PublicReadWrite
      BucketName: SKIMS-PUBLIC-BUCKET
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: aws:kms
              KMSMasterKeyID: KMS-KEY-ARN

Requirements​