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Lack of protection against deletion - ELB

Description​

The current configuration of Elastic Load Balancing has no Deletion Protection safety feature enabled.

Impact​

  • AWS load balancers can be accidentally deleted.
  • Load-balanced environments remain unsafe.
  • Intentional or accidental deletion of data integrity.

Recommendation​

Check the Deletion Protection configuration attribute value inside attributes section and enable it.

Threat​

Attacker with access to the AWS console that modifies or deletes information.

Expected Remediation Time​

⌚ 30 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: H
  • User interaction: N
  • Scope: U
  • Confidentiality: N
  • Integrity: N
  • Availability: H

Temporal​

  • Exploit code madurity: P
  • Remediation level: O
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
  • Score:
    • Base: 4.9
    • Temporal: 4.4
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

The resource has correctly configured its protection against deletion

Resources:
  LoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: "test-Application-Load-Balancer"
      IpAddressType: String
      LoadBalancerAttributes:
      - Key: "deletion_protection.enabled"
        Value: true
      - Key: "access_logs.s3.bucket"
        Value: "bk"

Non compliant code​

The resource does not have any protection against deletion

Resources:
  LoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: "test-Application-Load-Balancer"
      IpAddressType: String
      LoadBalancerAttributes:
      - Key: "deletion_protection.enabled"
        Value: false
      - Key: "access_logs.s3.bucket"
        Value: "bk"

Using the AWS CLI, verify that ELB has protection against deletion using the following command

$ aws elbv2 describe-load-balancer-attributes
      --region us-east-1
      --load-balancer-arn {elb_arn_id}
      --query 'Attributes[?(Key == `deletion_protection.enabled`)].Value | []'

If the command output returns false, deletion protection is not enabled for the selected instance

Requirements​

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