this post was submitted on 10 Jul 2023

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Lemmy.World Announcements

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883

Lemmy.world (and some others) were hacked (lemmy.world)

submitted 2 years ago* (last edited 2 years ago) by ruud@lemmy.world to c/lemmyworld@lemmy.world

273 comments fedilink hide all child comments

While I was asleep, apparently the site was hacked. Luckily, (big) part of the lemmy.world team is in US, and some early birds in EU also helped mitigate this.

As I am told, this was the issue:

There is an vulnerability which was exploited
Several people had their JWT cookies leaked, including at least one admin
Attackers started changing site settings and posting fake announcements etc

Our mitigations:

We removed the vulnerability
Deleted all comments and private messages that contained the exploit
Rotated JWT secret which invalidated all existing cookies

The vulnerability will be fixed by the Lemmy devs.

Details of the vulnerability are here

Many thanks for all that helped, and sorry for any inconvenience caused!

Update While we believe the admins accounts were what they were after, it could be that other users accounts were compromised. Your cookie could have been 'stolen' and the hacker could have had access to your account, creating posts and comments under your name, and accessing/changing your settings (which shows your e-mail).

For this, you would have had to be using lemmy.world at that time, and load a page that had the vulnerability in it.

(page 4) 50 comments

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[–] sma3in@lemmy.world 1 points 2 years ago

that is why I got logged off from my account this morning!! impressed by the rapid intervention!! Good job lemmy team!

[–] gabriele97@lemmy.g97.top 1 points 2 years ago (1 children)

How are you preventing it to happen again until a patch is released from devs?

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[–] mourkeer@lemmy.world 1 points 2 years ago (1 children)

I lost some of my post history. Is there a data issue that's come from this? Why are my comments gone?

[–] pgetsos@kbin.social 1 points 2 years ago (1 children)

If it is only recent post history, maybe it was purged along with many malicious comments/posts

[–] mourkeer@lemmy.world 1 points 2 years ago

I know but this was over a week of comments lost.

[–] chokidar@lemmy.world 1 points 2 years ago

Well done on acting on it so quickly. I think I did see some of the fake announcements you were referring too but were taken down very quickly. Keep up the good work team and thanks for everything you are doing!

[–] medvedev@lemmy.world 1 points 2 years ago

thanks to admin team for resolving that quickly

[–] Noedel@lemmy.world 1 points 2 years ago

Is this why I had to sign in and out of my account on liftoff?

I couldn't comment untill I did that. There may be others!

[–] mayo@lemmy.world 1 points 2 years ago

Been busy for lemmy team lately hopefully it's not too much

[–] downpunxx@lemmy.world 1 points 2 years ago

******* This happened to me, one of my posts had it's photo deleted (I didn't delete it), then when I replaced it, the next time I checked the entire post had been deleted.

[–] ext23@aussie.zone 1 points 2 years ago (1 children)

So is it safe to log back in?

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[–] weeahnn@lemmy.blahaj.zone 1 points 2 years ago (1 children)

is that why I can't log into my lemmy.world account?

[–] weeahnn@lemmy.world 1 points 2 years ago

ok not a problem anymore. seems like I just had to clear my cache and it let me log in

[–] xortingen@lemmy.world 1 points 2 years ago

Thanks for the quick response. Do we know if there was any data leak?

[–] sheetmysharts@lemmy.world 1 points 2 years ago

Thanks to everyone involved for the quick response 👍

[–] Uncle_Iroh@lemmy.world 1 points 2 years ago

You guys are quick!

[–] Notsosupermario@lemmy.world 1 points 2 years ago

Thanks for fixing and being so open about it

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