System Designer MCP Server

# Security Policy ## Supported Versions | Version | Supported | | ------- | ------------------ | | 1.0.x | :white_check_mark: | ## Reporting a Vulnerability The System Designer MCP Server team and community take security vulnerabilities seriously. We appreciate your efforts to responsibly disclose vulnerabilities. ### How to Report **Please do not open a public issue for security vulnerabilities.** To report a security vulnerability, please send an email to: **chevonmdphillip@gmail.com** Your email should include: - A clear description of the vulnerability - Steps to reproduce the issue (if applicable) - Potential impact of the vulnerability - Any suggested mitigation (if known) ### What to Expect - **Response Time**: We will acknowledge receipt of your vulnerability report within 48 hours. - **Initial Assessment**: We will provide an initial assessment of the report within 7 business days. - **Resolution**: We will work to address valid security vulnerabilities in a timely manner and aim to release patches in the next scheduled version or sooner if critical. ### Security Measures The System Designer MCP Server implements several security measures: #### Input Validation - All MCP tool inputs are validated using Zod schemas - Type safety prevents injection attacks - Input sanitization for file operations #### File System Access - No arbitrary file system access - Restricted to designated output directories - Safe file path handling #### Network Security - No external network calls initiated by the server - Optional CORS configuration for web deployments - No authentication credentials stored in code #### Runtime Isolation - Stateless operation in Cloudflare Workers environment - No persistent storage of user data - Sandboxed execution environment ### Security Best Practices for Users #### Development Environments - Keep dependencies updated: `bun update` - Use the latest version of the MCP server - Review tool outputs before execution #### Production Deployments - Configure appropriate CORS policies - Use environment variables for configuration - Monitor deployment logs for unusual activity - Consider rate limiting for public deployments #### Integration Security - Validate all inputs before passing to MCP tools - Use secure communication channels for remote deployments - Implement proper authentication in client applications ### Security Updates Security updates will be announced through: - GitHub Security Advisories - Release notes with security implications clearly marked - Critical updates may include additional notifications ### Security Research We welcome responsible security research and value the security community's efforts to improve the safety of our project. If you discover a potential vulnerability, please follow our reporting process above. ### Threat Model The System Designer MCP Server is designed with the following threat model in mind: #### Primary Threats Addressed 1. **Input Injection**: Malicious inputs attempting to execute arbitrary code 2. **Path Traversal**: Attempts to access files outside designated directories 3. **Resource Exhaustion**: Denial of service through excessive resource consumption 4. **Data Exposure**: Unauthorized access to system or user data #### Trust Boundaries - **LLM to Server**: The LLM provides structured data, server validates all inputs - **Server to File System**: Controlled access to designated directories only - **Server to Network**: No outbound network connections initiated by server - **Client to Server**: Secure MCP protocol communication ### Third-Party Dependencies We regularly review and update third-party dependencies to address known vulnerabilities. The project uses: - **@modelcontextprotocol/sdk**: MCP protocol implementation - **zod**: Schema validation and type safety - **fs-extra**: Safe file system operations - **commander**: Command-line interface parsing All dependencies are regularly audited using automated tools and manual review. ### Security Questions For security-related questions that are not vulnerability reports, please: - Check existing issues and documentation - Open a regular GitHub issue with the "security" label - Contact us at chevonmdphillip@gmail.com for sensitive questions --- Thank you for helping keep the System Designer MCP Server and its users safe!