Intel and Microsoft Unveil Another Meltdown & Specter Fault Classified as "Medium Risk"

Google's Zero and Microsoft today unveiled the latest variant of the Specter and Meltdown security vulnerabilities that were unveiled in January. Intel refers to this e as "Variant 4", and it uses some of the same security vulnerabilities as the original discovery …

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As reported by CNET Intel classifies the new variant as a "medium risk" vulnerability because "many" of the exploits it would benefit from were fixed by browsers during the initial set of patches.

Variant 4, like its predecessor, takes advantage of the speculative characteristics of a CPU and thus allows hackers to access sensitive information. The company writes in a blog post:

Like the other GPZ variants, variant 4 uses speculative executi, a feature comm to most modern processor architectures, to potentially expose certain types of data via a side channel. In this case, the researchers demstrated variant 4 in a language-based runtime envirment. Although we do not know of a successful browser exploit, the most comm use of runtimes, like JavaScript, is in web browsers.

Nevertheless, Intel says that it has provided microcode updates to the manufacturers and is waiting for a deployment.

We have already delivered variant 4 firmware firmware update to OEMs and system software vendors, and we expect it to be released in the producti BIOS and the. ..

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