this post was submitted on 10 Aug 2024
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Cybersecurity

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AMD is warning about a high-severity CPU vulnerability named SinkClose that impacts multiple generations of its EPYC, Ryzen, and Threadripper processors. The vulnerability allows attackers with Kernel-level (Ring 0) privileges to gain Ring -2 privileges and install malware that becomes nearly undetectable.

Tracked as CVE-2023-31315 and rated of high severity (CVSS score: 7.5), the flaw was discovered by IOActive Enrique Nissim and Krzysztof Okupski, who named privilege elevation attack 'Sinkclose.'

Full details about the attack will be presented by the researchers at tomorrow in a DefCon talk titled "AMD Sinkclose: Universal Ring-2 Privilege Escalation."

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[–] thadah@lemmy.world 12 points 1 month ago

I'd like to see the people that are for kernel-level anticheat running in their PCs 24/7 now.

Vanguard doesn't even let you play the game unless the anticheat has been active since boot afaik.

Every cybersec and even anyone minimally tech-savvy was saying this was a bad idea and what do you know, now we have objective evidence it is in fact a terrible, terrible idea.

[–] Flatfire@lemmy.ca 7 points 1 month ago (3 children)

No fix planned for Ryzen 3000 is a disappointment

[–] vikingtons@lemmy.world 3 points 1 month ago* (last edited 1 month ago)

That is indeed weird. I don't see a mention of summit and pinnacle ridge either, even though rome, castle peak and renoir are covered. Since this is fix is an AGESA upgrade, I'm inclined to believe it'll cover zen 2 on any platform.

I'll reach out for clarification. I have a Matisse X production system running and there's no way I'm leaving this be.

[–] antonionardella@lemmy.world 2 points 1 month ago

How it that conceivable?

Not that it changes anything, but it might be worth to voice our concerns

I found this thread on their forum:

https://community.amd.com/t5/processors/no-fix-for-new-sinkclose-exploit-on-3000-series-cpus/td-p/701290

[–] captain_aggravated@sh.itjust.works 1 points 1 month ago (1 children)

Yeah it really is, but a bit of a nudge to find a decent price on a 5600x.

[–] DarkThoughts@fedia.io 1 points 1 month ago (1 children)

Ryzen 5000 series is also affected.

[–] captain_aggravated@sh.itjust.works 2 points 1 month ago (1 children)

They're issuing a fix for the 5000 series but not the 3000 series. As a 3000 series owner and with Intel cumming in customer's eyes my next computer will be RISC-V Death to x86.

[–] DarkThoughts@fedia.io 0 points 1 month ago (1 children)

How is that fix being applied?

[–] Flatfire@lemmy.ca 2 points 1 month ago (1 children)

AGESA update applied via BIOS update. Effectively just a microcode patch. Pretty common, and since we're seeing Epyc CPUs from the same generation as Ryzen 3000/Zen 2 being patched, I feel like it's pretty lousy not to patch them as well.

[–] DarkThoughts@fedia.io 0 points 1 month ago (1 children)

Really not a fan of bios updates. The last time the progress bar got stuck for an eternity and I thought it bricked my motherboard. Too bad the 5600X3D isn't sold in Europe. I was contemplating upgrading to AMD from my 10400F, since the ram should be still compatible.

[–] Flatfire@lemmy.ca 1 points 1 month ago

BIOS updates are the only way to receive critical stability and security patches. They can take a bit of time, but these days its generally pretty straight forward. Some manufacturers even allow you to check online right from the UEFI so you don't need to rely on an ancient USB drive.

[–] BigSadDad@lemmy.world 7 points 1 month ago

For everyone who's posting but didn't actually read the CVE...

You need Malware with Kernel level access Already. Besides Anti Cheat for modern games, if you have malware with Kernel level access you're already really fucked.

In addition, this just appears to be a way for that Kernel malware to persist in a device. It's not impossible to detect. I wouldn't be surprised if we saw Windows Defender signatures for malware using it within the month.

I haven't seen the Def Con presentation, but the CVE is a "Maybe". There is no PoC (Proof of Concept, showing that an exploit works)...yet. keep an eye on that.

The CVE claims this "Could Maybe" allow based on logic, but none of the sources i found showed anyone actually using it. Maybe the Def Con presentation will. But unless I see someone post a repeatable exploit in a real world scenario, it feels superficial.

I want to reiterate that this IS a flaw and it IS a problem. But I would highly doubt you, rando consumer, will be affected.

Mitigations are to not be dumb on the Internet. Keep your browser updated and make sure your sensitive data is backed up and encrypted, basic stuff.

Happy to go in to it more. This is my jam.

[–] exu@feditown.com 2 points 1 month ago (1 children)

Maybe we could use this to disable the Intel ME equivalent for AMD on those generations.

[–] vikingtons@lemmy.world 1 points 1 month ago (1 children)

PSP is required for x86 core initialisation.

[–] aBundleOfFerrets@sh.itjust.works 1 points 1 month ago (1 children)

But if you can get around the signing requirements, it would be trivial to make the psp firmware only do that. (Probably not trivial, but at least technically feasable)

[–] vikingtons@lemmy.world 3 points 1 month ago* (last edited 1 month ago)

I did want to expand on this, I'd be curious as to what Jeremy Soller found getting certain Ryzen mobile platforms working with coreboot.

Perhaps we'll need to wait for OpenSIL for more comprehensive support.

Aside from x86 core init, PSP is still required for specific OS security requirements. Can at least take solace in the fact that OEMs seem to have completely turned down MS Pluton.

[–] Blaster_M@lemmy.world 2 points 1 month ago

Looks like it's time to upgrade....

[–] vikingtons@lemmy.world 2 points 4 weeks ago

The disclosure has been updated to include a fix designated for Matisse

https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7014.html

[–] csm10495@sh.itjust.works 1 points 1 month ago

Iiuc to exploit you already need kernel level access. I'd figure if something malicious made it that far, you're already screwed.

[–] DarkThoughts@fedia.io -1 points 1 month ago* (last edited 1 month ago)

According to AMD's advisory, the following models are affected:

EPYC 1st, 2nd, 3rd, and 4th generations
EPYC Embedded 3000, 7002, 7003, and 9003, R1000, R2000, 5000, and 7000
Ryzen Embedded V1000, V2000, and V3000
Ryzen 3000, 5000, 4000, 7000, and 8000 series
Ryzen 3000 Mobile, 5000 Mobile, 4000 Mobile, and 7000 Mobile series
Ryzen Threadripper 3000 and 7000 series
AMD Threadripper PRO (Castle Peak WS SP3, Chagall WS)
AMD Athlon 3000 series Mobile (Dali, Pollock)
AMD Instinct MI300A

So people have the choice between self destructing cpus, and those who pose a security threat to you. Though I guess Intel's Intel Management Engine and AMD's Platform Security Processor are already security threats anyway, since they're basically intended backdoors.