5 years, 10 months ago

Meltdown Redux: Intel Flaw Lets Hackers Siphon Secrets from Millions of PCs

More than a year has passed since security researchers revealed Meltdown and Spectre, a pair of flaws in the deep-seated, arcane features of millions of chip sold by Intel and AMD, putting practically every computer in the world at risk. Today Intel and a coordinated supergroup of microarchitecture security researchers are together announcing a new, serious form of hackable vulnerability in Intel's chips. Like Meltdown and Spectre, the new MDS attack takes advantage of security flaws in how Intel chips perform speculative execution, a feature in which a processor guesses ahead of time at what operations and data it will be asked to execute, in order to speed up the chip's performance. Herbort Bos, VUSec In these new cases, researchers found that they could use speculative execution to trick Intel's processors into grabbing sensitive data that's moving from one component of a chip to another. Unlike Meltdown, which used speculative execution to grab sensitive data sitting in memory, MDS attacks focus on the buffers that sit between a chip's components, such as between a processor and its cache, the small portion of memory allotted to the processor to keep frequently accessed data close at hand.

Wired

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