mcp-server-semgrep/semgrep-rules/ruby/lang/security/filter-skipping.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: filter-skipping
  patterns:
  - pattern-not: |
      $CALL "=~/.*(/:action.*).*/", $ACTION
  - pattern: |
      $CALL "=~/.*(/:action.*).*/"
  message: >-
    Checks for use of action in Ruby routes. This can cause Rails to render an arbitrary
    view if an
    attacker creates an URL accurately. Affects 3.0 applications. Can avoid the vulnerability
    by providing
    additional constraints.
  metadata:
    cwe:
    - 'CWE-1021: Improper Restriction of Rendered UI Layers or Frames'
    references:
    - https://github.com/presidentbeef/brakeman/blob/main/lib/brakeman/checks/check_filter_skipping.rb
    - https://groups.google.com/g/rubyonrails-security/c/NCCsca7TEtY
    category: security
    technology:
    - ruby
    owasp:
    - A04:2021 - Insecure Design
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
    confidence: LOW
  languages:
  - ruby
  severity: ERROR