I am not sure how secure is your network, but it may not necessarily be an issue. As far as Java is concerned DON'T update it. Somehow, Samsung does not like any updates on those, neither do they like a new POSTGRESQL update. The problem is the Java always want to update.
Somehow, Samsung has to resolve this. But in my case, I completely stear away from any updates (which gives me a headache, if I am honest as my users click any buttons the can....) unless is instructed by Samsung.
Bill