mcp-server-semgrep/semgrep-rules/ruby/rails/security/brakeman/check-unsafe-reflection.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: check-unsafe-reflection
  mode: taint
  pattern-sources:
  - pattern-either:
    - pattern: |
        cookies[...]
    - patterns:
      - pattern: |
          cookies. ... .$PROPERTY[...]
      - metavariable-regex:
          metavariable: $PROPERTY
          regex: (?!signed|encrypted)
    - pattern: |
        params[...]
    - pattern: |
        request.env[...]
  pattern-sinks:
  - patterns:
    - pattern: $X
    - pattern-either:
      - pattern-inside: |
          $X.constantize
      - pattern-inside: |
          $X. ... .safe_constantize
      - pattern-inside: |
          const_get(...)
      - pattern-inside: |
          qualified_const_get(...)
  message: Found user-controllable input to Ruby reflection functionality. This allows a remote user
    to influence runtime behavior, up to and including arbitrary remote code execution. Do not provide
    user-controllable input to reflection functionality. Do not call symbol conversion on user-controllable
    input.
  languages:
  - ruby
  severity: ERROR
  metadata:
    source-rule-url: https://github.com/presidentbeef/brakeman/blob/main/lib/brakeman/checks/check_unsafe_reflection.rb
    category: security
    cwe:
    - "CWE-94: Improper Control of Generation of Code ('Code Injection')"
    owasp:
    - A03:2021 - Injection
    technology:
    - ruby
    - rails
    references:
    - https://github.com/presidentbeef/brakeman/blob/main/test/apps/rails2/app/controllers/application_controller.rb
    cwe2022-top25: true
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: MEDIUM
    confidence: MEDIUM