Security-Use MCP Server

An MCP (Model Context Protocol) server that gives AI assistants like Cursor, Claude, and other MCP-compatible tools the ability to scan for security vulnerabilities and automatically fix them.

What It Does

This MCP server exposes four powerful security tools to your AI assistant:

Tool	Description
scan_dependencies	Scans your project's dependencies (requirements.txt, package.json, pyproject.toml, etc.) for known vulnerabilities using the OSV database
scan_iac	Scans Infrastructure as Code files (Terraform, CloudFormation) for security misconfigurations
fix_vulnerability	Automatically updates vulnerable packages to secure versions
fix_iac	Generates and applies fixes for IaC security issues

Supported Formats

Dependency Scanning

• Python: requirements.txt, pyproject.toml, Pipfile, Pipfile.lock, poetry.lock, setup.py
• JavaScript/Node.js: package.json, package-lock.json
• Java: pom.xml

Infrastructure as Code

• Terraform (.tf files)
• AWS CloudFormation (.yaml, .yml, .json)
• AWS SAM templates
• AWS CDK synthesized output

IaC Security Rules

The scanner checks for common AWS misconfigurations including:

• CKV_AWS_20: S3 buckets with public access (CRITICAL)
• CKV_AWS_19: S3 buckets without encryption (HIGH)
• CKV_AWS_23: Security groups with unrestricted ingress (HIGH)
• CKV_AWS_16: RDS instances without encryption (HIGH)
• CKV_AWS_3: EBS volumes without encryption (HIGH)
• CKV_AWS_35: CloudTrail not enabled (MEDIUM)
• CKV_AWS_14: IAM users without MFA (MEDIUM)
• CKV_AWS_12: VPC without flow logs (MEDIUM)

Installation

From PyPI

pip install security-use-mcp

From Source

git clone https://github.com/security-use/mcp.git
cd mcp
pip install -e .

Quick Setup for Cursor

1. Install the package (see above)

2. Add to Cursor's MCP configuration (~/.cursor/mcp.json):

{
  "mcpServers": {
    "security-use": {
      "command": "security-use-mcp",
      "args": [],
      "env": {}
    }
  }
}

If you installed from source or use a virtual environment:

{
  "mcpServers": {
    "security-use": {
      "command": "python",
      "args": ["-m", "security_use_mcp.server"],
      "env": {}
    }
  }
}

3. Restart Cursor

4. Test it - Open Cursor's AI chat and ask:

   "Scan this project for security vulnerabilities"

Usage Examples

Once configured, you can ask your AI assistant things like:

Dependency Scanning

• "Scan this project for vulnerable dependencies"
• "Check if my Python packages have any CVEs"
• "Are there any security issues in my requirements.txt?"

IaC Scanning

• "Scan my Terraform files for security issues"
• "Check this CloudFormation template for misconfigurations"
• "Are my S3 buckets configured securely?"

Fixing Vulnerabilities

• "Fix the requests vulnerability"
• "Update django to a secure version"
• "Fix the S3 bucket public access issue in main.tf"

Example Output

Dependency Scan Results

## Dependency Security Scan Results

**Found 2 vulnerabilities**

### CRITICAL (1)

#### requests (2.25.0)
- **ID**: GHSA-xxxx-yyyy-zzzz
- **Title**: CVE-2023-32681 - Unintended leak of Proxy-Authorization header
- **Fixed in**: 2.31.0

### HIGH (1)

#### django (3.1.0)
- **ID**: CVE-2023-xxxxx
- **Title**: SQL Injection in QuerySet.values()
- **Fixed in**: 3.2.19

IaC Scan Results

## IaC Security Scan Results

**Found 2 security issues**

### CRITICAL (1)

#### CKV_AWS_20: S3 bucket with public access
- **File**: `s3.tf:15`
- **Resource**: aws_s3_bucket.my-bucket
- **Remediation**: Set acl to 'private'

### HIGH (1)

#### CKV_AWS_23: Security group allows unrestricted ingress
- **File**: `sg.tf:8`
- **Resource**: aws_security_group.web
- **Remediation**: Restrict CIDR blocks to specific IPs

Configuration Options

Environment Variables

Variable	Description	Default
SECURITY_USE_LOG_LEVEL	Logging level (DEBUG, INFO, WARN, ERROR)	INFO
SECURITY_USE_CACHE_DIR	Directory for caching vulnerability data	System temp

Example configuration with environment variables:

{
  "mcpServers": {
    "security-use": {
      "command": "security-use-mcp",
      "args": [],
      "env": {
        "SECURITY_USE_LOG_LEVEL": "DEBUG"
      }
    }
  }
}

Development

Setup

# Clone the repository
git clone https://github.com/security-use/mcp.git
cd mcp

# Install with dev dependencies
pip install -e ".[dev]"

# Also install the core security-use package
pip install -e ../security-use

Running Tests

# Run all tests
pytest

# Run with coverage
pytest --cov=security_use_mcp

# Run specific test file
pytest tests/test_handlers.py -v

Linting

# Check code style
ruff check src/ tests/

# Auto-fix issues
ruff check src/ tests/ --fix

Testing the Server

You can test the MCP server directly:

# Start the server (it communicates via stdin/stdout)
python -m security_use_mcp.server

# Or use the entry point
security-use-mcp

Troubleshooting

Server Not Starting

1. Check Python version (requires 3.10+):

   python --version
   

2. Verify installation:

   pip show security-use-mcp
   pip show security-use
   

3. Test the server directly:

   python -c "from security_use_mcp.server import server; print('OK')"
   

Tools Not Appearing in Cursor

1. Restart Cursor after changing mcp.json
2. Check that the JSON is valid
3. Look for errors in Cursor's Developer Tools (Help > Toggle Developer Tools)

Scan Returns No Results

1. Make sure you have dependency files (requirements.txt, package.json, etc.) or IaC files (.tf, .yaml) in your project
2. Check that the path is correct when scanning specific directories

Architecture

security-use-mcp/
├── src/security_use_mcp/
│   ├── server.py          # MCP server implementation
│   ├── models.py          # Data models for results
│   └── handlers/          # Tool handlers
│       ├── dependency_handler.py
│       └── iac_handler.py
└── tests/
    ├── test_server.py     # Server tests
    ├── test_handlers.py   # Handler unit tests
    └── test_integration.py # Integration tests

The MCP server wraps the security-use Python package, which provides:

• Dependency scanning via the OSV (Open Source Vulnerabilities) database
• IaC scanning with configurable security rules
• Automated fixing capabilities

Related Projects

• security-use - Core security scanning library
• security-use-vscode - VS Code extension
• MCP Specification - Model Context Protocol documentation

License

MIT