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Threat Model Analysis for bottlepy/bottle

Threat: Path Traversal via Dynamic Routes

  • Description: An attacker manipulates URL path parameters in dynamic routes (e.g., /files/<filepath>) to access files outside the intended directory. They might craft URLs like /files/../../etc/passwd to read sensitive system files.
  • Impact: Unauthorized access to sensitive files, potential data breaches, system compromise.
  • Bottle Component Affected: Routing, Request Handling (specifically dynamic route parameters).
  • Risk Severity: High
  • Mitigation Strategies:
    • Strictly validate and sanitize user input in route handlers, especially path components.
    • Use os.path.normpath, os.path.abspath, and os.path.commonprefix to restrict file access within allowed directories.
    • Avoid directly using user input to construct file paths; use IDs or database references instead.

Threat: Server-Side Template Injection (SSTI)

  • Description: An attacker injects malicious code into user-controlled data that is then rendered by a vulnerable template engine (especially simple engines or Bottle's default if not used carefully). The template engine executes this injected code on the server.
  • Impact: Remote code execution, full server compromise, data breaches, denial of service.
  • Bottle Component Affected: Templating (if using Bottle's default or simple engines).
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Use a robust and secure templating engine like Jinja2 with auto-escaping.
    • Always escape user-provided data when rendering templates.
    • Avoid constructing templates dynamically from user input.

Threat: Insecure Default Development Server in Production

  • Description: An attacker exploits vulnerabilities or limitations of Bottle's built-in development server if it is mistakenly used in a production environment. This server is not designed for production and lacks security features and performance optimizations.
  • Impact: Denial of service, information disclosure, potential remote code execution depending on specific vulnerabilities in the development server.
  • Bottle Component Affected: Server (Bottle's built-in development server).
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Never use Bottle's built-in development server in production.
    • Use a production-ready WSGI server like Gunicorn, uWSGI, or Waitress.
    • Enforce the use of production servers in deployment procedures.