Essentials of Cloud Computing

335Security in Cloud Computing

purpose operating system, and less exposed, having fewer or no exter-

nally accessible network ports. A hypervisor does not undergo frequent

change and does not run third-party applications. The guest operating

systems, which may be vulnerable, do not have direct access to the hyper-

visor. In fact, the hypervisor is completely transparent to network trafc

with the exception of trafc to/from a dedicated hypervisor management

interface.”

Storage concerns: Another security concern with virtualization has to do with

the nature of allocating and deallocating resources such as local storage

associated with VMs. During the deployment and operation of a VM, data

are written into physical memory. If it is not cleared before ...