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Secure Virtualization Using SELinux (sVirt)

Aug 25, 2009, 15:33 (0 Talkback[s])
(Other stories by Dan Walsh)

"Before virtualization, we had isolated servers. A cracker taking over one server meant that he controlled just that server. The cracker would then have to launch network attacks against other servers in the environment. System administrators had lots of tools to defend against network attacks on machines: firewalls, network traffic analysis tools, intrusion detection tools, etc.

"After virtualization, we have multiple services running on the same host. If a virtual machine is broken into, the cracker just needs to break though the hypervisor. If a hypervisor vulnerability exists, the cracker can take over all of the virtual machines on the host. He can even write into any virtual host images that are accessible from the host machine.

"This is very scary stuff. The question is not "if", but "when". Hacker/cracker conventions are already examining hypervisor vulnerabilities. Crackers have already broken though the xen hypervisor, as I documented in one of my previous blogs.

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