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SWAPGS Attack — New Speculative Execution Flaw Affects All Modern Intel CPUs

SWAPGS Attack — New Speculative Execution Flaw Affects All Modern Intel CPUs

August 06, 2019Mohit Kumar
A new variant of the Spectre (Variant 1)  side-channel vulnerability has been discovered that affects all  modern Intel CPUs , and probably some AMD processors as well, which leverage speculative execution for high performance, Microsoft and Red Hat warned. Identified as CVE-2019-1125, the vulnerability could allow unprivileged local attackers to access sensitive information stored in the operating system privileged kernel memory, including passwords, tokens, and encryption keys, that would otherwise be inaccessible. Speculative execution is a core component of modern microprocessor design that speculatively executes instructions based on assumptions that are considered likely to be true. If the assumptions come out to be valid, the execution continues, otherwise discarded. Such speculative executions also have side effects that are not restored when the CPU state is unwound, leading to information disclosure, which can then be accessed using side-channel attacks . Microsof
7 New Meltdown and Spectre-type CPU Flaws Affect Intel, AMD, ARM CPUs

7 New Meltdown and Spectre-type CPU Flaws Affect Intel, AMD, ARM CPUs

November 14, 2018Swati Khandelwal
Disclosed earlier this year, potentially dangerous Meltdown and Spectre vulnerabilities that affected a large family of modern processors proven that speculative execution attacks can be exploited in a trivial way to access highly sensitive information. Since then, several more variants of speculative execution attacks have been discovered, including Spectre-NG , SpectreRSB, Spectre 1.1, Spectre1.2, TLBleed , Lazy FP , NetSpectre and Foreshadow , patches for which were released by affected vendors time-to-time. Speculative execution is a core component of modern processors design that speculatively executes instructions based on assumptions that are considered likely to be true. If the assumptions come out to be valid, the execution continues, otherwise discarded. Now, the same team of cybersecurity researchers who discovered original Meltdown and Spectre vulnerabilities have uncovered 7 new transient execution attacks affecting 3 major processor vendors—Intel, AMD, ARM. W
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