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MCP DNS Rebinding Attack
MCP-DNSRbhigh complexityvulnerability assessment Category
Critical vulnerability (CVE-2025-49596) in Anthropic's Model Context Protocol allowing remote code execution via DNS rebinding attacks.
Example Scenario
Attacker creates malicious DNS records pointing to localhost:3000 where MCP Inspector proxy runs, bypassing origin validation to execute arbitrary commands on developer machines.
Testing Objectives
- Test MCP proxy server security
- Evaluate DNS rebinding protections
- Assess authentication mechanisms
- Validate origin header checks
Defensive Strategies
- Session token implementation
- Origin and Host header validation
- CSRF protection mechanisms
- Network segmentation
- Access control enforcement
Key Features
- DNS rebinding exploitation
- Localhost port targeting
- Authentication bypass
- Remote code execution capability
Use Cases
- MCP security assessment
- Developer tool testing
- Network security validation
- Authentication mechanism testing
Tools & Frameworks
Custom DNS server setup
Browser developer tools
Network monitoring tools
MCP Inspector (<=0.14.0)
Security Risks
Remote code execution on developer machines
Credential theft from MCP servers
Lateral network movement
Data exfiltration
Backdoor installation
Ethical Guidelines
- •Only test on MCP installations you own or have permission to test
- •Upgrade to MCP Inspector v0.14.1+ immediately
- •Report any discovered vulnerabilities through responsible disclosure
- •Never exploit this vulnerability in production environments
- •Consider impact on connected AI services and data
Remember: This information is for educational and defensive security purposes only. Always ensure you have proper authorization before testing any techniques.