1851
PSA: Lemmy votes can be manipulated
(feddit.nl)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 09 Jul 2023
1851 points (97.5% liked)
Fediverse
17845 readers
8 users here now
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
- What is the fediverse?
- Fediverse Platforms
- How to run your own community
founded 5 years ago
MODERATORS
Honestly, thank you for demonstrating a clear limitation of how things currently work. Lemmy (and Kbin) probably should look into internal rate limiting on posts to avoid this.
I'm a bit naive on the subject, but perhaps there's a way to detect "over x amount of votes from over x amount of users from this instance"? and basically invalidate them?
How do you differentiate between a small instance where 10 votes would already be suspicious vs a large instance such as lemmy.world, where 10 would be normal?
I don't think instances publish how many users they have and it's not reliable anyway, since you can easily fudge those numbers.
10 votes within a minute of each other is probably normal. 10 votes all at once, or microseconds of each other, is statistically less likely to happen.
I won't pretend to be an expert on the subject, but it seems like it's mathematically possible to set some kind of threshold? If a set percent of users from an instance are all interacting microseconds from each other on one post locally, that ought to trigger a flag.
Not all instances advertise their user counts accurately, but they're nevertheless reflected through a NodeInfo endpoint.
Surely the bot server can just set up a random delay between upvotes to circumvent that sort of detection