Restrict S3 Buckets FULL_CONTROL Access for Authenticated Users

ID: s3-auth-fullcontrol

Severity: critical

Author: princechaddha

Tags: cloud,devops,aws,amazon,s3,aws-cloud-config

Description

Checks if Amazon S3 buckets grant FULL_CONTROL access to authenticated users, preventing unauthorized operations

YAML Source

id: s3-auth-fullcontrol
info:
  name: Restrict S3 Buckets FULL_CONTROL Access for Authenticated Users
  author: princechaddha
  severity: critical
  description: |
    Checks if Amazon S3 buckets grant FULL_CONTROL access to authenticated users, preventing unauthorized operations
  reference:
    - https://docs.aws.amazon.com/AmazonS3/latest/userguide/manage-versioning-examples.html
  metadata:
    max-request: 2
  tags: cloud,devops,aws,amazon,s3,aws-cloud-config

flow: |
  code(1)
  for(let bucketName of iterate(template.buckets)){
    set("bucket", bucketName)
    code(2)
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws s3api list-buckets --query 'Buckets[*].Name'

    extractors:
      - type: json # type of the extractor
        internal: true
        name: buckets
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
        aws s3api get-bucket-acl --bucket $bucket --query 'Grants[?(Grantee.URI==`http://acs.amazonaws.com/groups/global/AuthenticatedUsers`)]'

    matchers:
      - type: word
        words:
          - '"Permission": "FULL_CONTROL"'

    extractors:
      - type: dsl
        dsl:
          - '"FULL_CONTROL is enabled for Authenticated Users on S3 Bucket " + bucket'
# digest: 490a0046304402201b8296a6828ae2b35d3454c1f92ef6d96b2a09cb4b22967494d3313f39d114030220579ce49b530440be34e8d11749678af4fbea901d9f0471403cee2bb284368d72:922c64590222798bb761d5b6d8e72950

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/s3/s3-auth-fullcontrol.yaml"

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