mcp-server-semgrep/semgrep-rules/ruby/lang/security/file-disclosure.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: file-disclosure
  message: >-
    Special requests can determine whether a file exists on a filesystem that's outside
    the Rails app's
    root directory. To fix this, set config.serve_static_assets = false.
  metadata:
    cwe:
    - "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
    references:
    - https://github.com/presidentbeef/brakeman/blob/main/lib/brakeman/checks/check_file_disclosure.rb
    - https://groups.google.com/g/rubyonrails-security/c/23fiuwb1NBA/m/MQVM1-5GkPMJ
    category: security
    technology:
    - ruby
    owasp:
    - A05:2017 - Broken Access Control
    - A01:2021 - Broken Access Control
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
    confidence: LOW
  languages:
  - ruby
  severity: ERROR
  pattern: config.serve_static_assets = true
  fix-regex:
    regex: =(\s)*true
    replacement: = false