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ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

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191–200 of 337 posts

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#191

People should realize that ancient Chinese were onto something when they told that all phenomena shall evolve only so much before they tip over the peak of maximum development and inevitably rumble downhill into overdevelopment. P.S. Wow, hit a soft spot. Flagging this for what? For being unloyal to the ideology of everlasting growth? Try again as much as you can.

Downvoted for the frothy edit. Chill out there ya toughy. Someone clearly hit a soft spot on you.

[deleted]

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#192

Apparently Intel attempted to play down the issue by trying to award the researchers with the 40,000 dollar tier reward and a separate 80,000 dollar reward as a "gift" (which the researchers kindly denied) instead of the maximum 100,000 reward for finding a critical vulnerability. Intel was also planning to wait for at least another 6 months before bringing this to light if it wasn't for the researchers threatening t…

Intel has abused the responsible disclosure process for economic gain. Their Leadership was not interested in a repeat of the spectre and meltdown impact on their stock price and made the (most likely accurate) assessment, that recurring news of intel vulnerabilities would harm their stock more than delay and cumulated release. As a result Academic Researchers were denied some of the credit they would otherwise have rightfully earned, because their individual contributions are buried in a sea of similar publications. Research efforts were thus needlessly duplicated. Research which could have formed the basis for subsequent research was unavailable and (publicly funded) researchers wasted time duplicating results. If two researchers discover the same vulnerabilities independently, there should be no embargo on disclosures because it has to be assumed with a high likelihood that third-parties might already be actively exploiting it. The public has to be warned, even if no effective mitigation is available. If for a subset of the vulnerabilities, AMD and ARM are not affected then security conscious users could have been reducing their exposure by utilizing competitors chips.

In this case the practice of responsible disclosure has been turned on its head. There should no longer be any responsible disclosure with Intel as long as they do not commit to changing their behavior.

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#193
post #110

Earlier quoted context omitted.

That's not exactly true. Broadly speaking, there have been two very different kinds of speculative execution vulnerabilities with different security implications and workarounds. Spectre and its relatives are an attack on trusted code that process untrusted data using certain code patterns guarded by conditionals that can be speculatively executed; they're inherent to speculative execution past branches, but they req…

Yes, that's true, several of the vulnerabilities involve checks that are performed late (not at time of speculative access, but at some point before instruction commit). Not excusing the design choice at all, but it's conceivable that an engineer could make this choice if (i) side-channel effects of the speculation are not considered at all, and (ii) the postponement of the check allows the load latency to be reduced…

I’m not a CPU architect, but it seems like Intel saved a couple gates by putting garbage instead of zeroes in the pipeline.

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#194

People should realize that ancient Chinese were onto something when they told that all phenomena shall evolve only so much before they tip over the peak of maximum development and inevitably rumble downhill into overdevelopment. P.S. Wow, hit a soft spot. Flagging this for what? For being unloyal to the ideology of everlasting growth? Try again as much as you can.

Downvoted for the frothy edit. Chill out there ya toughy. Someone clearly hit a soft spot on you.

[deleted]

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#195

Why doesn't this type of news cause INTC to tank - they're up today. I know the market is up today, but (and it's probably my innate overreaction) I would think this sort of news would cause its stock to suffer.

I think there is an expectation that Intel's new generation CPUs wont have these vulnerabilities and they will sell these a lot more to replace the piece of crap they have sold for ridiculous prices. Intel is actually probably happy about these, because no one cares.

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#197
post #11
post #6

Looks like AMD Cpus are safe again.

Note that Spectre definitely affected AMD chips and in general these sorts of side channel attacks based on speculative execution are extremely likely to be effective against any chip (including AMD manufactured ones) that employ speculative execution though the precise implementation might have to be jiggered a bit.

Sure, but please don't downplay this, so far Intel CPU's are affected by way more vulnerabilities that could be exploited much easily. It is a no brainer to pick if I have to choose between AMD and Intel today.

Re: ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

#199
post #10

Sorry for being naive. Are these kind of CPU Securities vulnerabilities new? Why it is in the past 20 years we have had close to zero in the news ( At least I wasn't aware of any ) and ever since Spectre and Meltdown we have something new like every few months. And as far as I am aware they are mostly Intel CPU only. Why? And Why not AMD? Something in the Intel design process went wrong? And yet all the Cloud Vendor…

This is a common pattern for new bug classes. Nobody thought to look at this, and when they did, the rabbit hole went deep. We likely haven’t seen the bottom. AMD are not better. They’re probably worse. They’ll be looked at when the Intel tree stops bearing fruit. But finding an Intel bug is higher impact, so that’s what researchers want to look at.

Bullshit, So far most vulnerabilities only affected Intel. Because of their choices in their design. AMD is way better, so far.
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