Exposed VPC Endpoint

ID: vpc-endpoint-exposed

Severity: medium

Author: princechaddha

Tags: cloud,devops,aws,amazon,vpc,aws-cloud-config

Description

Identify and secure fully accessible Amazon VPC endpoints to prevent unauthorized access to AWS services.

YAML Source

id: vpc-endpoint-exposed
info:
  name: Exposed VPC Endpoint
  author: princechaddha
  severity: medium
  description: |
    Identify and secure fully accessible Amazon VPC endpoints to prevent unauthorized access to AWS services.
  impact: |
    Allows unrestricted access to AWS services via the exposed VPC endpoint, potentially leading to data leakage or unauthorized operations.
  remediation: |
    Update the VPC endpoint's policy to restrict access only to authorized entities and ensure all requests are signed.
  reference:
    - https://docs.aws.amazon.com/vpc/latest/userguide/vpc-endpoints-access.html
  metadata:
    max-request: 2
  tags: cloud,devops,aws,amazon,vpc,aws-cloud-config
variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let VpcIds of iterate(template.VpcId)){
    set("vpc", VpcIds)
    code(2)
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws ec2 describe-vpc-endpoints --region $region --output table --query 'VpcEndpoints[*].VpcEndpointId' --output json

    extractors:
      - type: json
        name: VpcId
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
         aws ec2 describe-vpc-endpoints --region $region --vpc-endpoint-ids $vpc --query 'VpcEndpoints[*].PolicyDocument' --output json

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"AWS": "*"'
          - '"Principal": "*"'

      - type: word
        words:
          - "Condition"
        negative: true

    extractors:
      - type: dsl
        dsl:
          - '"VPC endpoints for " + vpc + "are exposed."'
# digest: 4a0a0047304502206b7f7ad65cafa7d576fe2fca2e7b7ea38dee4b9bdb02d18bfc4965cbe280ee5e022100f3b46231f12106be78517b440b8a0e42706cdbc9c0486736fe4578f364ec05a9:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/aws/vpc/vpc-endpoint-exposed.yaml"

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