Originally posted here by gore
Everything commented out, and any running services shut down that may be running before. No services are running, and upon boot up, after installation, SSH and Apache were shut off which sometimes run by default, they were shut down, and none no longer start up, as they were commented out and no longer start upon boot.

So what do you think? No services at all, but it's on a LAN with a connection too the Internet.
so you have an "equivalent" config of an firewall protected machine that allows connections (being started) from inside, but not from outside.

However, since you start connections from inside, you open your "guard" and you can get some kind of malware on those connections. And because you dont have any other protection, that malware can OPEN connections to outside and doom your machine.

On the other hand, i cant see an easy a way to attack you machine if you dont have a previous "channel" with the attacker. BUt you can receive DoS attacks, since your machine has tcp/ip stack active. Im not sure if anyone can compromise tcp/ip stack per se and get some kind of priv escalation since you dont have anything inside it to be "valuable" to be infected (such as a daemon).