Overclock.net - An Overclocking Community - View Single Post - [TH] New AMD Side Channel Attacks Discovered, Impacts Zen Architecture

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post #14 of (permalink) Old 03-07-2020, 08:38 AM
sudo apt install sl
Join Date: Dec 2009
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Quote: Originally Posted by Schmuckley View Post
How do they get the IP to do that? NoScript stops all that, problem solved.

Bro, in 1998, the people I knew were the ones making the javascript upload clone sites, k?

Copy site, add javascript addition, find host and mimic orig site. This is NOT news.
Also it works on everything, even MACs [IMG class=inlineimg]/forum/images/smilies/redface.gif[/IMG]

This isn't just some AMD-specific exploit, it's a javascript thing.
It's an AMD cache exploit, the news is right in front of you. Just takes a minute to read. Something I noticed people stopped doing on this site.

To optimize the energy consumption and performance of their
CPUs, AMD introduced a way predictor for the L1-data (L1D) cache
to predict in which cache way a certain address is located. Conse-
quently, only this way is accessed, significantly reducing the power
consumption of the processor.

In this paper, we are the first to exploit the cache way predic-
tor. We reverse-engineered AMD’s L1D cache way predictor in
microarchitectures from 2011 to 2019, resulting in two new attack
techniques. With Collide+Probe, an attacker can monitor a vic-
tim’s memory accesses without knowledge of physical addresses
or shared memory when time-sharing a logical core. With Load+
Reload, we exploit the way predictor to obtain highly-accurate
memory-access traces of victims on the same physical core. While
Load+Reload relies on shared memory, it does not invalidate the
cache line, allowing stealthier attacks that do not induce any last-
level-cache evictions.

We evaluate our new side channel in different attack scenarios.
We demonstrate a covert channel with up to 588.9 kB/s, which we
also use in a Spectre attack to exfiltrate secret data from the kernel. Furthermore, we present a key-recovery attack from a vulnerable cryptographic implementation. We also show an entropy-reducing attack on ASLR of the kernel of a fully patched Linux system, the hypervisor, and our own address space from JavaScript. Finally, we propose countermeasures in software and hardware mitigating the presented attacks.

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