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A zero-day attack is an attack that relies on an undisclosed vulnerability in the design or implementation of a system in order to violate its security. Most commonly, such attacks consist of using zero-day exploits to access information systems or execute code on privileged systems. Such exploits are called 'zero-day' because security administrators have ...


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Amazon advisory links to the original XEN advisory on which one can read: Systems running only x86 PV guests are not vulnerable. So no problem for the PV instances. Regarding the HVM ones, Amazon explains that for performance reasons they managed to replace the HVM hardware drivers by the PV ones for storage and network operations (see PV on HVM). ...



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