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If someone can access my Ubuntu VirtualBox files, can they hack into it?

Is it hard?

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"If someone can access my ubuntu virtualbox files, can they hack into it?"

If someone is able to access your files, why should he hack it?

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they don't know the password to login? – user27449 Sep 22 '10 at 14:10
if they don't know the password, they are unable to access the files – Michael K Sep 22 '10 at 15:25
@Michael K: I think he meant the password of the VirtualMachine. – Bobby Sep 22 '10 at 15:51
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user27449, note that they don't need to log in. Unless your drives are encrypted, they can mount them as "Drive 2" and read all the files, or even replace a Windows (or other OS) file with a keylogger or other Trojan. IOW: to answer your original question: yes. – CarlF Sep 22 '10 at 16:26
+1 CarlF: You should have made that an answer, it's a good one. The answer to the second part of OP's question is NO. It's pretty easy for anyone with even a little VM knowledge. Just a clarification, for CarlF's replacement scenario to work they'd need read/write access to the .VirtualBox directory tree. – hotei Sep 22 '10 at 17:06
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If someone is able to access the files associated with the virtual hard drive, then yes, it is possible to modify the content of the files from the virtual hard drive. I believe it is not hard to do it: as I remember, it is possible to mount the virtual hard drive and to access (read/write/delete/whatever) files from it.

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If they have access to the hard disk image files, then they could mount those images in their own VirtualBox machines. This isn't hard, and would probably let them see the files on the disks (unless you have disk encryption turned on, or something similar). In that sense, yes they could "hack into it".

Getting access to the content within those files is a similar but separate matter. Are the files password-protected, encrypted, etc.? Are the passwords stored in the disk image?

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