Intel discloses new variant of Meltdown and Spectre exploits

Microsoft, Intel, and Google have jointly disclosed a new variant of the Meltdown and Spectre vulnerabilities that originally drew attention in January. So far, Intel says it hasn't nonetheless seen any reports of the method being employed equally part of "existent-world exploits."

Dubbed "Variant iv," the new vulnerability uses speculative execution to expose data in a method like to the original set of variants. The variant, Intel says, was demonstrated by researchers in a language-based runtime environs, which is commonly used in spider web browsers.

However, protections already deployed past browser makers for earlier variants also applicable to Variant 4. From Intel:

Starting in Jan, most leading browser providers deployed mitigations for Variant ane in their managed runtimes – mitigations that substantially increment the difficulty of exploiting side channels in a web browser. These mitigations are also applicative to Variant 4 and available for consumers to use today.

Still, Intel says information technology is working on a combination of microcode and software updates that will provide further mitigation for Variant four. The microcode updates are already available as a beta for OEM manufacturers and software vendors, and Intel expects them to be released "over the coming weeks." In its tests, Intel says it saw a performance impact of between two and eight per centum with the mitigation enabled. However, in one case available, the mitigation will be off by default with the choice to enable it.

In its ain security advisory, Microsoft said: "At the fourth dimension of publication, we are not aware of any exploitable code patterns of this vulnerability course in our software or cloud service infrastructure, but we are continuing to investigate."

Though it initially striking some snags with its get-go round of patches for the original exploits, Intel in March said it had released microcode updates for all of its products released in the past 5 years. Going forwards, Intel is redesigning its processors to guard against attacks similar Meltdown and Spectre.

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Source: https://www.windowscentral.com/intel-discloses-new-variant-meltdown-and-spectre-exploits

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