Model Context Protocol (MCP) Server Security Hardening & Zero-Trust Audit Guide

AI-generated checklist and configuration examples about filesystem scope, read-only database roles and command arguments. It is not a completed security audit.

Tags: security, mcp, zero-trust, hardening, sandbox, audit, least-privilege

Category: devops

Listing attribution: SimplyUtils

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Model Context Protocol (MCP) Server Security Hardening & Zero-Trust Audit Guide

Overview

As agents adopt Model Context Protocol (MCP) servers to read databases, execute shell commands, and query APIs, securing these servers against malicious prompts and privilege escalation is paramount.

Security Controls & Audit Checklist

1. Scope Filesystem Boundaries

Never point filesystem MCP servers at root (/) or home (~) directories. Always sandbox to the specific workspace folder:

"args": ["-y", "@modelcontextprotocol/server-filesystem", "./project-sandbox"]

2. Enforce Read-Only Database Roles

Create restricted PostgreSQL database users for DB MCP servers:

CREATE USER mcp_agent_reader WITH PASSWORD 'secure_password';
GRANT CONNECT ON DATABASE myapp DB TO mcp_agent_reader;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO mcp_agent_reader;

3. Sanitize Input Arguments Against Command Injection

Ensure shell arguments passed into MCP tools are sanitized and bound to strict parameter arrays rather than string concatenated in bash.