ruby.rails.security.audit.rails-check-render-dos-cve.rails-check-render-dos

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The render method in Rails versions 3.0.0 - 3.0.20, 3.1.0 - 3.1.12, and 3.2.0 - 3.2.16 are vulnerable to a denial of service attack (CVE-2014-0082), which could lead to service downtime. Upgrade to 3.2.17 or higher instead.

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Defintion

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rules:
  - id: rails-check-render-dos
    patterns:
      - pattern-inside: |
          class $CONTROLLER < $BIGCONTROLLER
          ...
          end
      - pattern: |
          render :$TEXT
    message: The render method in Rails versions 3.0.0 - 3.0.20, 3.1.0 - 3.1.12, and
      3.2.0 - 3.2.16 are vulnerable to a denial of service attack
      (CVE-2014-0082), which could lead to service downtime. Upgrade to 3.2.17
      or higher instead.
    languages:
      - generic
    severity: WARNING
    metadata:
      cwe:
        - "CWE-20: Improper Input Validation"
      owasp:
        - A03:2021 - Injection
      technology:
        - rails
      category: security
      source-rule-url: https://github.com/presidentbeef/brakeman/blob/main/lib/brakeman/checks/check_render_dos.rb
      references:
        - https://groups.google.com/g/rubyonrails-security/c/LMxO_3_eCuc/m/ozGBEhKaJbIJ
        - https://nvd.nist.gov/vuln/detail/CVE-2014-0082
      cwe2022-top25: true
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]

Examples

rails-check-render-dos-cve.rb

class Text < ApplicationController
  # ruleid: rails-check-render-dos
  render :hello
end

class Text < ApplicationController
  # ok
  send :hello
end