Hidden service: Is it possible for an attacker to break out of a VM?

[hikki at Safe-mail.net]

The title says it all:

Several people recommend running a hidden service from within a VM, 
to prevent attackers from doing side channel attacks and reading off your 
hardware components and serial numbers.

Then I heard that attackers can actually break out of VM's if they get root 
access on it due to a successful attack.

I just want your opinions on that one, thanks!
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