Boostspeed coupon5/3/2023 Intel says this has prompted it to share its findings with other chipmakers so they can assess any potential impact. As such, this isn't a microarchitecture-specific attack - any processor with dynamic power and thermal management is potentially impacted. However, it should theoretically apply to almost all modern CPUs because it works by observing the power algorithms behind the Dynamic Voltage Frequency Scaling (DVFS) technique, a staple of modern processors. It has only been proven on Intel and AMD silicon. Hertzbleed can be exploited remotely - it doesn't require physical access. The vulnerability impacts all Intel processors and AMD Zen 2 and Zen 3, but it isn't clear if it will impact the upcoming Zen 4 Ryzen 7000. Cryptographic implementations that are already hardened against power side-channel attacks aren't susceptible to the Hertzbleed vulnerability. An attacker can convert that power information to timing data, allowing them to steal cryptographic keys. As with most workloads, the power signature of a cryptographic workload varies due to the CPU's dynamic boost clock frequency adjustments during the workload. In this case, by observing the power signature of any given cryptographic workload. Like all side-channel attacks, a Hertzbleed-based attack steals data by observing or exploiting a secondary effect of an operation on a system. Today's coordinated disclosure brings the issue into the public eye, but it is likely that CPUs from other vendors are also impacted. Intel says it had found this vulnerability via internal security investigations, but external research teams later disclosed their findings to the company. The vulnerability doesn't impact all cryptographic code, but some mitigation techniques for impacted systems come with as-yet-undefined performance penalties. According to external researchers, both Intel and AMD CPUs are impacted, but AMD hasn't issued an advisory yet. Intel and researchers from UT Austin, UIUC, and UW published papers today outlining the ' Hertzbleed' chip vulnerability that allows side-channel attacks that can steal secret AES cryptographic keys by observing the CPU's boost frequency/power mechanisms.
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