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Insecure service configuration - Bucket

Description​

The native S3 VersioningConfiguration resource, which allows to preserve, recover and restore each version of each object stored in the Buckets due to causes such as malicious actions of users or application failures, is not enabled.

Impact​

  • Delete information from S3 buckets permanently.
  • Avoid recovering information that was deleted by mistake or maliciously.

Recommendation​

Securely configure the Buckets by enabling the VersioningConfiguration resource.

Threat​

Internet attacker with access to S3 Buckets.

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: X

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:X
  • Score:
    • Base: 4.9
    • Temporal: 4.4
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

All services should have the versioning configuration correctly configured

resource "aws_s3_bucket" "state_bucket" {
  bucket        = "${data.aws_caller_identity.current.account_id}-terraform-state"
  acl           = var.acl
  force_destroy = var.force_destroy

  versioning {
    enabled = true
  }

  server_side_encryption_configuration {
    rule {
      apply_server_side_encryption_by_default {
        kms_master_key_id = aws_kms_key.mykey.arn
        sse_algorithm     = "aws:kms"
      }
    }
  }
}

Non compliant code​

There are services without the versioning configuration resource configured

resource "aws_s3_bucket" "state_bucket" {
  bucket        = "${data.aws_caller_identity.current.account_id}-terraform-state"
  acl           = var.acl
  force_destroy = var.force_destroy

  versioning {
    enabled = false
  }

  server_side_encryption_configuration {
    rule {
      apply_server_side_encryption_by_default {
        kms_master_key_id = aws_kms_key.mykey.arn
        sse_algorithm     = "aws:kms"
      }
    }
  }
}

Using the AWS CLI, the following command check if the S3 configuration has the versioning flag enabled

$ aws s3api get-bucket-versioning
      --bucket {bucket_id}

If the command does not return any CLI output, the S3 versioning feature is not enabled for the searched bucket

Requirements​

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