I created a virtualbox for ubuntu guest and my host is windows 8.1. Do I need to be carefull with virus passing from the ubuntu virtualbox to the real hard drive on windows?
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If you are not copying between them then no... Most of the viruses will not run on linux/ubuntu therefore will not infect the host OS.
A better thing to do is to install calmav on ubuntu and have a good antivirus on windows.
AdigaJo
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The probability is extremly low. The Linux guest will not (be able to) run a virus designed for Windows. Thus it can't infect anything. There might be a vulnerability that affects Virtualbox that might be used to infect the host system. Can't be ruled out, but I have never heard of the like. And since this would have a very limited audience, it's not likely that anyone would code such a thing.
But: If you use shared folders to copy files back and forth between host and guest or share the clipboard, you might quite easily bring some malware onto your system, though, in a way that it would be accessible from the windows side, too. You might be unfortunate enough to run it then, while working in windows. So be sure to wear an uptodate virus scanner nevertheless. And just for good measure, installing clamav (an Open Source virus scanner running on Linux, used mostly for finding Windows viruses in data stored on a Linux system) in the guest won't hurt.
Hinz
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