Technology

57432 readers

3502 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

founded 1 year ago

MODERATORS

623

submitted 5 months ago by [email protected] to c/[email protected]

64 comments fedilink hide all child comments

The attack has been dubbed GoFetch: https://gofetch.fail/

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 9 points 5 months ago* (last edited 5 months ago)

So the attack is (very basically, if I understand correctly)

Setup:

Attack:

I send data that in some intermediate state of decryption will look like a pointer
This "pointer" contains some information about the secret key I am trying to steal
The prefetcher does it's thing loading the data "pointed to" in the cache
I can observe via a cache side channel what the prefetcher did, giving me this "pointer" containing information about the secret key
Repeat until I have gathered enough information about the secret key

Is this somewhat correct? Those speculative execution vulnerabilities always make my brain hurt a little