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by cyanydeez 75 days ago
Isn't the primary security concern with thirdparty MCP servers the actual injected context and not whatever sandbox the MCP server is in? It doesn't really matter if the MCP can't do something to it's host; it's that it can manipulate the context to whatever ends it deems fit, which then is intractable in whatever LLM is calling it.

I'm really struggling to understand what peoples security concepts are with LLMs.
2 comments
TZubiri 75 days ago
There's this naïve approach to security that obsesses with building walls, because walls are secure and nothing gets through.

Apparently a lot of people get nerd sniped into building impenetrable 10meter thick steel walls instead of thinking about doors and the windows.

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sReinwald 75 days ago
Third-party MCP servers create at least two different security problems. One is prompt/context injection through the tool output. The other is the much more conventional risk of executing untrusted code with transient dependencies on your machine (which is how the recent litellm compromise was discovered).

Containerization only helps with the second one, not the first, but that still matters. If you’re going to run random third-party MCP servers, isolating them from your host and any sensitive local data is still an obvious improvement over no isolation.

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