this post was submitted on 30 Sep 2023
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184
GPUs from all major suppliers are vulnerable to new pixel-stealing attack (arstechnica.com)
submitted 1 year ago by [email protected] to c/[email protected]
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[–] [email protected] 23 points 1 year ago (1 children)

Pixel stealing PoC for deanonymizing a user, run with other tabs open playing video. “Ground Truth” is the victim iframe (Wikipedia logged in as “Yingchenw”). “AMD” is the attack result on a Ryzen 7 4800U after 30 minutes, with 97 percent accuracy. “Intel” is the attack result for an i7-8700 after 215 minutes with 98 percent accuracy.

I guess I should take a course on threat analysis, because I don't have a clue how to determine how dangerous this is.

[–] [email protected] 7 points 1 year ago (2 children)

the pixel is the just the base unit.. expand the exploit and you get 'images'. any image on the remote site... and from there you could target sites that use imaging for password/username stuff (as a method of preventing text-based exploits).

the one pixel leads to lots of nonsense

its a teeny tiny hole, but thats all you need

[–] [email protected] 14 points 1 year ago* (last edited 1 year ago)

That and apparently a lot of time. Am I right in reading it could take hours to leak enough pixels to form an image? So to get a password the password would need to be plain text, visible on the target website, and not be moved, removed or otherwise changed for hours.

[–] [email protected] 3 points 1 year ago

yeah, but if it takes 215 minutes to get just a single word... I mean, I'm not going to have a webpage open for that long.