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
This should be probably pinned.
This might be related but I’ve noticed that someone is [likely automatically] following my posts and downvoting them. Kind of funny in a 'verse without karma.
Karma may mean nothing but the information space is a strategic domain.
I don’t think it’s the case here, as I’ve noticed this after posts in small communities:
- c/linguistics (~240 members)
- c/parana (1 member - new comm)
I think that the person/bot/whatever is following specific people.
deleted by creator
CAPTCHA is the bare minimum. Who the hell turns it off?
There is an argument to be made that captchas can be automatically bypassed with some effort.
OTOH, the current wave of bots is quite clearly favoring instances with captcha disabled, so clearly it’s acting as at least a small deterrent.
Edit: Forgot to mention this earlier, but the upcoming update to Lemmy will actually remove captchas. Discussion:
Sometimes, security just means not being the low-hanging fruit.
Doing no captcha is like leaving the door open, hoping no-one breaks in, instead of at least closing the door (a closed door decreases chance of break in by near 100%, even if it’s not locked)
captchas block script kiddies at the very least
there’s a browser addon that lets you solve Recaptcha with one click:
https://addons.mozilla.org/en-US/firefox/addon/buster-captcha-solver/it automatically switches to the alternative accessibility option, which is based on typing in words that you hear, and uses speech recognition software to solve it. I’m fairly sure it could be automated quite easily.
Still way better than nothing at all
Some advanced OCR can hack the easier ones, but it’s unusual.
Thanks for the heads up, StarTrek.website has enabled CAPTCHA and purged the bots from our database.
Starfleet takes changeling infiltrations seriously :P
It was brought to my attention that my instance was hit with the spam bots regs. I’ve disabled registration and deleted the accounts from the DB. is there anything else I can do to clear the user stats on the sidebar? EDIT: I have reversed the stats too.
You can do this by updating
site_aggregates.usersin your database (WHERE site_id = 1)
Sounds like a spez sponsored attack on Lemmy.
Or just the unavoidable spam bot accounts coming as long as it’s easy and the instance operators being still unprepared.
Here we go: https://overseer.dbzer0.com/
API doc: https://overseer.dbzer0.com/api/
curl -X 'GET' \ 'https://overseer.dbzer0.com/api/v1/instances' \ -H 'accept: application/json'Will spit out suspicious instances based on fediverse.observer . You can adjust the threshold to your own preference.
Nice! Would be cool if you could also include current statuses of captchas, emails, and application requirements.
Tell me how to fetch them and it will. ;)
I think the easiest option is to just iterate through the list of suspicious instances, and then check
{instance_url}/api/v3/sitefor each of them. Relevant keys of the response json aresite_view.local_site.captcha_enabled,site_view.local_site.registration_mode, andsite_view.local_site.require_email_verification.Since it’s a bunch of separate requests, probably it makes sense to do these in parallel and probably also to cache the results at least for a while.
It occurs to me that this kind of thing is better left to observer, as it’s set up to poll instances and gather data. I would suggest you ask them to ingest and expose this data as well
Every time I see that moustache I know to pay attention!
First Anti-spam service ready: https://lemmy.dbzer0.com/post/95652
One thing I like about lemmy was having to put in an application and waiting for approval. I knew I was vetted and others here were too.
Figure that alone could keep out most of the trolls and definitely the bots.
I suspect that there’s going to need to be some analysis software that can run on the kbin and lemmy server logs looking for suspicious stuff.
Say, for instance, a ton of accounts come from one IP. That’s not a guarantee that they’re malicious – like, could be some institution that NATs connections or something. But it’s probably worth at least looking at, and if someone signed up 50 accounts from a single IP, that’s probably at least worth red-flagging to see if they’re actually acting like a normal account. Especially if the email provider is identical (i.e. they’re all from one domain).
Might also want to have some kind of clearinghouse for sharing information among instance admins about abuse cases.
One other point:
I would recommend pre-emptively banning as many bot accounts as possible,
A bot is not intrinsically a bad thing. For example, I was suggesting yesterday that it would be neat if there was a bot running that posted equivalent nitter.net links in response to comments providing twitter.com links, for people who want to use those. There were a number of legitimately-helpful bots that ran on Reddit – I personally got a kick out of the haiku bot, that mentioned to a user when their comment was a haiku – and legitimately-helpful bots that run on IRC.
Though perhaps it would be a good idea to either adopt a convention ("bots must end in “Bot”) or have some other way for bots to disclose that they are bots and provide contact information for a human, in case they malfunction and start causing problems.
But if someone is signing up hordes of them, then, yeah, that’s probably not a good actor. Shouldn’t need a ton of accounts for any legit reason.
I’m noobish, but could they be defederated until they get their act together before they spam everybody?
Yes, and I believe some instances are already doing this
Yep, I noticed that as well: https://lemmy.dbzer0.com/post/87761
FYI, startrek.website has purged the bot accounts and enabled CAPTCHA. Just letting you know because they were showing up on your list.
Good to hear. once fediverse observer updates your usercount, this should clear itself out. Let me know if this is not the case soon
Are you already defederating from suspicious instances? If not, What are you planning to do?
I am and I’ve already started work on https://github.com/db0/lemmy-overseer
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.
