ruby.rails.security.brakeman.check-dynamic-render-local-file-include.check-dynamic-render-local-file-include

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Found request parameters in a call to render in a dynamic context. This can allow end users to request arbitrary local files which may result in leaking sensitive information persisted on disk.

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rules:
  - id: check-dynamic-render-local-file-include
    mode: search
    paths:
      include:
        - "*.erb"
    patterns:
      - pattern: |
          params[...]
      - pattern-inside: |
          render :file => ...
    message: Found request parameters in a call to `render` in a dynamic context.
      This can allow end users to request arbitrary local files which may result
      in leaking sensitive information persisted on disk.
    languages:
      - generic
    severity: WARNING
    metadata:
      technology:
        - ruby
        - rails
      category: security
      cwe:
        - "CWE-22: Improper Limitation of a Pathname to a Restricted Directory
          ('Path Traversal')"
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      source-rule-url: https://github.com/presidentbeef/brakeman/blob/main/lib/brakeman/checks/check_render.rb
      references:
        - https://owasp.org/www-project-web-security-testing-guide/v42/4-Web_Application_Security_Testing/07-Input_Validation_Testing/11.1-Testing_for_Local_File_Inclusion
        - https://github.com/presidentbeef/brakeman/blob/f74cb53ead47f0af821d98b5b41e16d63100c240/test/apps/rails2/app/views/home/test_render.html.erb
      cwe2022-top25: true
      cwe2021-top25: true
      subcategory:
        - vuln
      likelihood: MEDIUM
      impact: MEDIUM
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]