Lemmy

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Everything about Lemmy; bugs, gripes, praises, and advocacy.

For discussion about the lemmy.ml instance, go to [email protected].

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PSA: Many Lemmy instances are currently experiencing massive automated sign-ups (bots)! If you run an instance with open sign-ups, please read! (lemm.ee)

submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/[email protected]

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Today, a bunch of new instances appeared in the top of the user count list. It appears that these instances are all being bombarded by bot sign-ups.

For now, it seems that the bots are especially targeting instances that have:

Open sign-ups
No captcha
No e-mail verification

I have put together a spreadsheet of some of the most suspicious cases here.

If this is affecting you, I would highly recommend considering one of the following options:

Close sign-ups entirely
Only allow sign-ups with applications
Enable e-mail verification + captcha for sign-ups

Additionally, I would recommend pre-emptively banning as many bot accounts as possible, before they start posting spam!

Please comment below if you have any questions or anything useful to add.

Update: on lemm.ee, I have defederated the most suspicious spambot-infested instances.

To clarify: this means small instances with an unnaturally fast explosion in user counts over the past day and very little organic activity. I plan to federate again if any of these instances get cleaned up. I have heard that other instances are planning (or already doing) this as well.

It's not a decision I took lightly, but I think protecting users from spam is a very important task for admins. Full info here: https://lemm.ee/post/197715

If you're an admin of an instance that's defederated from lemm.ee but wish to DM me, you can find me on Matrix: @sunaurus:matrix.org

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

Maybe this is what's implied or I'm just being silly; What is to stop a bad actor spinning up a Lemmy instance, creating a bunch of bot accounts with no restrictions, and spamming other instances? Would the only route of action be for the non spam instances to individually defederate the spam ones? Seems like that would be a bit of a cat and mouse situation. I'm not too familiar with the inner workings and tools that Lemmy has that would be useful in this situation

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[–] [email protected] 1 points 2 years ago

had to create an account to post since my comments from sffa.community and kbin.social weren't showing up.

I'm an admin over at sffa.community. We did notice the bot wave. They never got past email verification. We hve since implemented CAPTCHA and have purged the bots from our database.

You can see we are down to organic users. We've only been officially open for a couple weeks so we're still working on content but we are safe to federate with again, if you'd like.

[–] [email protected] 1 points 2 years ago* (last edited 2 years ago) (1 children)

Looks like my instance got hit with a bot. I had email verification enabled but had missed turning on captcha (captcha enable should be up with enabling email verification settings). The bot used fake emails so none of the accounts are verified, but still goes towards account numbers. Is there really any good way to clean this up? Need a way to purge unverified accounts or something.

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

How comfortable are you with SQL? You can see all unused verifications in the email_verification table. You should be able to just delete those users from local_user, and then update your user count with the new count of the local_user table in site_aggregates.user (where site_id = 1)

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