I pointed capgate at Damn Vulnerable MCP. Here's what it caught — and what it couldn't.
The author of capgate, a capability-compiler tool, tested its effectiveness against the Damn Vulnerable MCP (DVMCP) project, which features ten deliberately broken MCP servers designed to demonstrate various attacks. Capgate aims to enforce sandbox policies based on declared capabilities, preventing or limiting exploits. The test revealed that capgate successfully stopped an excessive permission scope attack by restricting file access to only the public directory, rendering a path-traversal vulnerability harmless. However, for other challenges like token theft and command injection, capgate could not entirely prevent the exploit but significantly reduced its impact by blocking network access or limiting file system operations. AI
IMPACT Capgate's ability to limit the blast radius of exploits in MCP servers highlights a practical approach to enhancing the security of AI agent execution environments.