id: graphql-alias-batching

info:
  name: GraphQL Alias-based Batching
  author: Dolev Farhi
  severity: info
  description: |
    GraphQL supports aliasing of multiple sub-queries into a single queries. This allows users to request multiple objects or multiple instances of objects efficiently.
    However, an attacker can leverage this feature to evade many security measures, including rate limit.
  remediation: |
    Limit queries aliasing in your GraphQL Engine to ensure mitigation of aliasing-based attacks.
  reference:
    - https://github.com/dolevf/Damn-Vulnerable-GraphQL-Application
    - https://cheatsheetseries.owasp.org/cheatsheets/GraphQL_Cheat_Sheet.html
    - https://graphql.security/
    - https://stackoverflow.com/questions/62421352/graphql-difference-between-using-alias-versus-multiple-query-objects-when-doin
  metadata:
    max-request: 2
  tags: graphql,misconfig
variables:
  str: "{{to_lower(rand_text_alpha(5))}}"

http:
  - raw:
      - |
        POST /graphql HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"query":"query {\n {{str}}1:__typename \n {{str}}2:__typename \n {{str}}3:__typename \n {{str}}4:__typename \n {{str}}5:__typename \n {{str}}6:__typename \n }"}
      - |
        POST /api/graphql HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"query":"query {\n {{str}}1:__typename \n {{str}}2:__typename \n {{str}}3:__typename \n {{str}}4:__typename \n {{str}}5:__typename \n {{str}}6:__typename \n }"}

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"data":'
          - '"{{str}}1":'
          - '"{{str}}6":'
        condition: and

      - type: word
        part: header
        words:
          - "application/json"

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