AMD processors from 2011 to 2019 vulnerable to two new attacks

Minimalist · Mar 7, 2020

Academics disclose new Collide+Probe and Load+Reload attacks on AMD CPUs.
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https://www.zdnet.com/article/amd-processors-from-2011-to-2019-vulnerable-to-two-new-attacks/

guest · Mar 9, 2020

AMD Downplays CPU Threat Opening Chips to Data Leak Attacks
March 9, 2020
https://threatpost.com/amd-downplays-cpu-threat-opening-chips-to-data-leak-attacks/153516/

AMD is seeking to downplay side-channel attacks that can leak potentially sensitive data from its processors released between 2011 and 2019.

AMD this weekend said it does not believe these are “new speculation-based attacks” and did not offer any mitigations: “We are aware of a new white paper that claims potential security exploits in AMD CPUs, whereby a malicious actor could manipulate a cache-related feature to potentially transmit user data in an unintended way,” said AMD in a Saturday advisory.

“The researchers then pair this data path with known and mitigated software or speculative execution side channel vulnerabilities. AMD believes these are not new speculation-based attacks.”
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In an email to Threatpost, researchers responded that “Take A Way” presented several side-channel attacks, but only one of them could be combined with speculative execution. Speculative execution is not required to exploit the side channel flaw, they said.

“Indeed, these are not new speculation-based attacks,” Daniel Gruss, one of the researchers behind the attack, told Threatpost via email. “But we also never said they were!? So, I don’t know why they would make such a statement – it seems to have nothing to do with our attacks.”
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