Submitted 10 months ago by Jamie@jamie.moe to selfhosted@lemmy.world
cross-posted from: jamie.moe/post/113630
There have been users spamming CSAM content in !lemmyshitpost@lemmy.world causing it to federate to other instances. If your instance is subscribed to this community, you should take action to rectify it immediately. I recommend performing a hard delete via command line on the server.
I deleted every image from the past 24 hours personally, using the following command:
sudo find /srv/lemmy/example.com/volumes/pictrs/files -type f -ctime -1 -exec rm {} \;
So, from memory there has been:
This recent attack Regular DDOS attacks Frequent attempts to spam community creation That one time the instance got hacked and set to redirect to shock sites Am I missing anything?
This seems like more than just a few trolls. Maybe someone really doesn’t want to see user-owned social media take off.
I see where you’re going with this, but no, people really are just absolutely horrible. The fact is that with other social media they’re just already very set up in managing this so we never see it. Lemmy wants to be open, this is the flipside of that openness.
It’s generally easy to crap on what’s ‘bad’ about big players, while underestimating or undervaluing what they are doing right for product market fit.
A company like Meta puts hundreds of people in foreign nations through PTSD causing hell in order to moderate and keep clean their own networks.
While I hope that’s not the solution that a community driven effort ends up with, it shows the breadth of the problems that can crop up with the product as it grows.
I think the community will overcome these issues and grow beyond it, but jerks trying to ruin things for everyone will always exist, and will always need to be protected against.
To say nothing for the far worse sorts behind the production and more typical distribution of such material, whom Lemmy will also likely eventually need to deal with more and more as the platform grows.
It’s going to take time, and I wouldn’t be surprised if the only way a federated social network eventually can exist is within onion routing or something, as at a certain point the difference in resources to protect against content litigation between a Meta and someone hosting a Lemmy server is impossible to equalize, and the privacy of hosts may need to be front and center.
It is very reminiscent of the trolls in the earlier web.
big F in chat for those of you dealing with this. my #1 fear about setting upand instance.
It impacts everyone when this shit happens. It takes time for mods/admins to take down. And you can’t unsee it.
I hope nobody else has the misfortune of stumbling on that shit
There have been studies which found playing tetris for an hour or two after seeing something traumatic can prevent it taking root in our longterm memory.
I tried it once after accidentally clicking a link on reddit that turned out to be gore, I can’t remember exactly what it was now (about 9 months later) so it must have worked
Yeah you really can’t. I’m pretty desensitized from earlier internet with death and other shock gore content but had managed to avoid CSAM until today. It was a lot worse than I expected, felt my heart drop. Worse, my app autoplays gifs in thumbnail so it kept going while I was reporting it.
I’ve mostly forgotten and it wasn’t on my mind until I saw this thread (happened less than 24hr ago) but even the slightest reminder is oddly upsetting. Wish I’d thought of the Tetris thing.
I literally am going to give up social media in general if this doesn’t stop
Seen it last night late around 3am shit made me sick I honestly almost cried but I just closed the app and tried not to think about it
Whatever the goal is it’s a stark reminder that there is monsters creeping in the shadows every where you go
Why do these deranged fucks do this
You really think the trolls would pass up on this golden opportunity?
Archive.org gets crapped up this way, too. Repulsive people posting repulsive stuff, “troll” is too kind a word.
I got lucky. I am not subscribed to this community, and I am the only person on my instance. But what if I was subscribed and hadn’t seen this post? This is too much responsibility for me.
I just shut down my instance until we can disable cached images. If that never happens, then I’m not bringing it back up.
Shout-out to github.com/wescode/lemmy_migrate. I moved my subscriptions over in a minute or two, and now, other than not having my post history, it’s exactly the same.
It is coming, don’t worry.
Do we have a PR or issue tracking that? That’s a pretty major item I’m looking forward to
Likely scum moves from reddit patriots to destroy or weaken the fediverse.
I remember when Murdoch hired that Israeli tech company in Haifa to find weaknesses is TV smart cards and then leaked it to destroy their market by flooding counterfit smart cards.
They are getting desperate along with those DDOS attacks.
I checked and there shouldn’t be any images stored on the server when running lemmy 1.18.4. The post was made in high emotional distress and shouldn’t be taken at a face value. If the posts are bothering you I advise purging the posts in question. (I have already done that)
How did you check this? From my understanding, images from external servers are copied (and transcoded) over locally. At least in my server (running 0.18.4), they do.
There is a possibility that my instance is buggy and it isn’t caching images even though it should.
It depends on how the image posted, the thumbnails might get federated. If the image is used in a post/comment body, usually the thumbnails are not federated.
I’m on 1.18.4, once I deleted the most recent images, the former CSAM posts became broken images. So yes, it was pulling from local disk cache.
I was looking into self hosting. What can I do to avoid dealing with this? Can I not cache images? Would I get in legal trouble for being federated with an instance being spammed?
If the source deletes the post. Won’t that remove it from all the instances ?
That’s sounds like a feature request.
There was a weird JSON error I was getting in the last few minutes. I’m not sure if this is at all related.
I am using the Lemmy easy deploy would this command works?
You’ll need to find where the actual container files are being stored. I’m unfortunately not familiar with Lemmy Easy Deploy, but you should have a folder that has some files/folders like docker-compose.yml, volumes, lemmy.hjson.
The important one is the volumes/pictrs/files folder, take the full path of that folder and replace it with the /srv/lemmy/example.com… path from the original post, and then that command should work.
I’m not subscribed to that community, but I guess I’m glad Pictrs doesn’t work for me, since I am using the Yunohost version of Lemmy. The creators of the Yunohost package couldn’t get it to work. I haven’t really missed it honestly.
Can you run lemmy without pictrs? What behavior is different?
What’s CSAM?
Child sexual assault material - underage porn. For obvious reasons, you don’t want this to be something you’re hosting automatically out of your basement server.
That’s why I though. Back in my day it was called CP.
Could someone please ELI5 that script. I’m all for keeping things clean, but old enough to remember the days of console based trolling.
Looks fairly sane, finds every file in the given directory that was created in the last 24 hours and deletes them. Personally if you are dealing with CSAM I’d be using shred instead of just rm
sudo find /srv/lemmy/example.com/volumes/pictrs/files -type f -ctime -1 -exec rm {} \;
sudo
As root
find /srv/lemmy/example.com/volumes/pictrs/files
Find files in /srv/lemmy… that:
-type f
Are plain files (not directories, symlinks, etc; includes images)
-ctime -1
And were created within an amount of time (probably last day, haven’t used this flag in a while)
-exec rm {} \;
For each matching file found execute rm on it (delete it).
I don’t think rm is gonna cut it if you have that shit on disk
To be clear, if no one on a given instance sub to that particular /c, the content won’t federate to said instance, correct?
At this point, the community is clean. So unless more is posted, then you should be good. If someone searched for the community and caused a preview to load while the content was active though, then it could be an issue.
Is it possible to prune pictrs by community name?
Not really. You could technically locate the images and determine precisely which ones they are from their filenames, but that means you actually have to view the images long enough to pull the URL. I had no desire to view them for even a moment, and just universally removed them.
As mentioned in my edit above though, ensure you are in compliance with local regulations when dealing with the material in case you have to do any preservation for law enforcement or something.
There is a purge community option available for admins but that did nothing.
How would I exclude files that I uploaded, though?
aseriesoftubes@lemmy.world 10 months ago
Someone is trying really hard to hurt Lemmy by continually attacking the most popular instance. Is this all coming from right-wingers upset that their nazi instances were defederated across basically the whole fediverse?
SheeEttin@lemmy.world 10 months ago
The simplest explanation is 4chan types just doing it for the lulz.
Kungolicious@lemmy.world 10 months ago
My tin foil hat is telling me it’s one of the other social media companies funding a hacking group to do it. They stand to have the most to lose, and they’ve seemingly decided to enjoy changing the narrative regarding multiple topics. Lemmy stands directly against what the bigger social medias stand for.
I have no evidence to back this though. As a business owner I just know that things become very consistent when people are being paid, and very inconsistent when they aren’t. These attacks are seemingly very consistent/organized.
phillaholic@lemm.ee 10 months ago
You think a company that is posed to go public is going to attack a competitor with a minuscule amount of traffic with extremely illegal material that could put them in prison for even having?
The_Picard_Maneuver@lemmy.world 10 months ago
There must be room under that tinfoil hat for the both of us, because this was my first thought too.
CryptoRoberto@sh.itjust.works 10 months ago
I wouldn’t put it past the hexbear crazies throwing a tantrum. They claim to be left wing… Sure seem more like fascist trumper types though. Maybe it’s just that they’re all incels and incels all seem about the same.
Fylkir@lemmy.sdf.org 10 months ago
Throwing a tantrum about what exactly? They’re one of the oldest-running Lemmy instances. Until now they were running a fork based on a pre-Federation version of the codebase.
You believe they did a bunch of work migrating their database only to then negate that work by destroying the community they wanted to Federate with?
Ep1cFac3pa1m@lemmy.world 10 months ago
Considering all the alt-right garbage that was popping up there the last couple of days this seems at least plausible. I sometimes envy their ability to utterly destroy anything they touch.