Server security

I made up some scenarios so you would better understand my questions.

First scenario:
Client knocks on the door. The server opens the door. Client says hey I want "start.html". Server answer and says here you go!

Second scenario:
Client knocks on the door. The server opens the door. Client says hey I want allpasswords. Server says piss off.

In this case the server gets a request and validates it. The request is not valid/approved so the client dont get anything.

Now I wonder is this following scenario possible?:
Client knocks on the door. The server opens the door. Client says hey I want allpasswords. Server says piss off. Client gets angry and beats the shit out of the server. Now the client can get through the door and search and find anything he wants.

I cant see how this scenario is possible in a client/server communication? That a client gets inside a entrie filesystem/machine with the "client/server" model.(meaning if the server doesn't send back anything, the client doesn't get anything either)

I can see how a server can maybe send back bad information if the request doesn't get validated, but nothing worse than that (like getting inside a computer and browse through files).

Can someone please give me some feedback on this?
I'd say be more creative in trying to pass off someone else's work as your own.
http://www.cplusplus.com/forum/windows/245716/

Clearly this is just spam or a troll... personally I would just report the post.
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