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Security Bugs at CPU Level Again

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Security
  • Google and Microsoft disclose new CPU flaw, and the fix can slow machines down

    Microsoft and Google are jointly disclosing a new CPU security vulnerability that’s similar to the Meltdown and Spectre flaws that were revealed earlier this year. Labelled Speculative Store Bypass (variant 4), the latest vulnerability is a similar exploit to Spectre and exploits speculative execution that modern CPUs use. Browsers like Safari, Edge, and Chrome were all patched for Meltdown earlier this year, and Intel says “these mitigations are also applicable to variant 4 and available for consumers to use today.”

    However, unlike Meltdown (and more similar to Spectre) this new vulnerability will also include firmware updates for CPUs that could affect performance. Intel has already delivered microcode updates for Speculative Store Bypass in beta form to OEMs, and the company expects them to be more broadly available in the coming weeks. The firmware updates will set the Speculative Store Bypass protection to off-by-default, ensuring that most people won’t see negative performance impacts.

  • Spectre variants 3a and 4

    Intel has, finally, disclosed two more Spectre variants, called 3a and 4. The first ("rogue system register read") allows system-configuration registers to be read speculatively, while the second ("speculative store bypass") could enable speculative reads to data after a store operation has been speculatively ignored. Some more information on variant 4 can be found in the Project Zero bug tracker. The fix is to install microcode updates, which are not yet available.

  • Red Hat Says It'll Soon Fix the Speculative Store Bypass Security Vulnerability

    Red Hat informed us today that they are aware of the recently disclosed Speculative Store Bypass (CVE-2018-3639) security vulnerability and will soon release updates to mitigate the issue on all of its affected products.

    Speculative Store Bypass (CVE-2018-3639) is a security vulnerability recently unearthed by various security researchers from Google and Microsoft, and it appears to be a fourth variant of the Spectre hardware bug publicly disclosed earlier this year in modern microprocessor, and later discovered to affect billions of devices. The Speculative Store Bypass vulnerability appearently lets an unprivileged attacker to bypass restrictions and gain read access to privileged memory.

SJVN and Phoronix

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