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Threat Model Analysis for doctrine/inflector

Threat: Regular Expression Denial of Service (ReDoS)

  • Threat: Regular Expression Denial of Service (ReDoS)
  • Description: An attacker crafts malicious input strings specifically designed to exploit vulnerable regular expressions within the inflector library. By providing these inputs to inflector functions (e.g., Inflector::pluralize(), Inflector::singularize()), the attacker can cause the regular expression engine to enter a state of excessive backtracking. This leads to high CPU consumption and potentially freezes the application, resulting in a denial of service for legitimate users. The attacker might repeatedly send these malicious requests to amplify the impact.
  • Impact: Application unavailability, server resource exhaustion, potential impact on other applications sharing the same server, financial loss due to downtime, reputational damage.
  • Affected Component: Regular expressions used within various inflector functions, particularly in pluralization and singularization rules.
  • Risk Severity: High
  • Mitigation Strategies:
    • Input Validation and Sanitization: Sanitize and validate all user-supplied input before passing it to inflector functions. Implement restrictions on input length and allowed characters.
    • Regular Expression Review and Testing: While not directly modifiable, understand the regex patterns used by doctrine/inflector. Test with various inputs, including potentially malicious ones, to identify performance bottlenecks. Consider using static analysis tools for ReDoS detection.
    • Dependency Updates: Keep doctrine/inflector updated to the latest version to benefit from potential security fixes and performance improvements in regular expressions.
    • Rate Limiting: Implement rate limiting on API endpoints or application features that utilize inflector and are exposed to public input.
    • Resource Monitoring: Monitor server CPU and memory usage to detect and respond to potential DoS attacks.
    • Consider alternative inflector libraries or methods if ReDoS risk is deemed too high and cannot be adequately mitigated.