DollhouseMCP

# Security Implementation Summary - July 11, 2025 ## Overview Successfully implemented comprehensive security framework addressing critical vulnerabilities identified in security audit (Issues #199-#208). ## Security Test Framework ✅ - **Created**: SecurityTestFramework with utilities for testing common vulnerabilities - **RapidSecurityTesting**: Quick CI/CD security checks (<30 seconds) - **Test Patterns**: ReDoS, SSRF, XSS, command injection, path traversal, YAML bombs - **28 Security Tests**: All passing ## Critical Vulnerabilities Fixed ### 1. Command Injection (Issue #199) ✅ **Implementation**: Enhanced `src/utils/git.ts` - Command whitelisting (git, npm, node, npx only) - Argument validation against safe patterns - Restricted PATH environment variable - Using spawn() instead of exec() ### 2. Path Traversal (Issue #200) ✅ **Implementation**: Created `src/security/pathValidator.ts` - Validates all file paths against allowed directories - Detects traversal patterns (.., ./, null bytes) - Safe file read/write with size limits (500KB) - Dynamic initialization for custom personas directories - Updated all file operations in index.ts to use PathValidator ### 3. YAML Deserialization (Issue #201) ✅ **Implementation**: - Created `src/security/yamlValidator.ts` - Existing `src/security/secureYamlParser.ts` already secure - Uses yaml.FAILSAFE_SCHEMA (most restrictive) - Blocks dangerous tags (!!js/function, !!python/object) - YAML bomb protection (anchor/alias limits) - Field validation with Zod schema ### 4. Input Validation (Issue #203) ✅ **Implementation**: Enhanced existing `src/security/InputValidator.ts` - Validates persona names, URLs, categories - SSRF protection for URLs (blocks private networks) - Base64 validation with size limits - XSS protection (removes HTML-dangerous characters) ## NPM Scripts Added ```json { "security:critical": "jest __tests__/security/tests --maxWorkers=4", "security:rapid": "npm run security:critical && npm audit", "security:all": "jest __tests__/security --coverage", "security:report": "npm run security:all -- --json --outputFile=security-report.json", "pre-commit": "npm run security:rapid" } ``` ## Files Modified/Created 1. **Security Validators**: - `src/security/commandValidator.ts` - Command execution security - `src/security/pathValidator.ts` - Path traversal protection - `src/security/yamlValidator.ts` - YAML parsing security - `src/security/index.ts` - Updated exports 2. **Core Updates**: - `src/utils/git.ts` - Enhanced with command validation - `src/index.ts` - All file operations use PathValidator 3. **Security Tests**: - `__tests__/security/framework/SecurityTestFramework.ts` - `__tests__/security/framework/RapidSecurityTesting.ts` - `__tests__/security/tests/command-injection.test.ts` - `__tests__/security/tests/path-traversal.test.ts` - `__tests__/security/tests/yaml-deserialization.test.ts` ## Security Improvements - ✅ No direct file system access without validation - ✅ All commands validated before execution - ✅ YAML parsing secured against code execution - ✅ Input validation prevents injection attacks - ✅ Path operations restricted to allowed directories - ✅ Comprehensive test coverage for security scenarios ## Next Steps 1. Implement file locking (Issue #204) to prevent race conditions 2. Add token security management (Issue #202) 3. Enhance rate limiting (Issue #207) 4. Improve error handling to prevent information disclosure (Issue #206) 5. Add session management security (Issue #208) ## Testing Run security tests: ```bash npm run security:rapid # Quick security check npm run security:all # Full security test suite ``` All 28 security tests passing. Regular unit tests unaffected (428 passing). ## Commits 1. `73bff88` - Implement security test framework and critical vulnerability tests 2. `8dfafea` - Implement security validators to fix path traversal and YAML vulnerabilities 3. `866019b` - Fix PathValidator initialization for dynamic personas directory Ready to create PR for security implementation.