this post was submitted on 10 Jul 2023
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Lemmy.World Announcements

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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.

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[–] Magiwarriorx@lemmy.world 3 points 1 year ago (1 children)

Is it possible cookies for other websites were scraped? I was logged in to .world at the time; I have logged out of all accounts, and reset passwords as a precaution, but want to know if I should be on the lookout from this.

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[–] binary45@lemmy.world 3 points 1 year ago (2 children)

Is that why I got logged off?

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[–] Jakdracula@lemmy.world 3 points 1 year ago (4 children)

I’d like to logout, then log back in, because I can’t upvote / downvote- how do I logout? I can’t seem to find a logout button.

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[–] Molecular0079@lemmy.world 3 points 1 year ago

Thanks for the post-mortem and the quick fix! Glad you guys around to help battle test Lemmy's code.

[–] dreadedsemi@lemmy.world 3 points 1 year ago

I hope devs will examine all parts of the code that display content to make sure proper sanitization

[–] Pillarist@lemmy.world 3 points 1 year ago (2 children)

I had an issue of being logged out of my account and could not log back in, after closing and reopening the site, closing browser, etc until I cleared my cookies, then it let me back in. If that helps anyone.

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[–] CaptainProton@lemmy.world 3 points 1 year ago

Occasional cookie deletions I understand, but will sign-ins persist in the future?

[–] adamlc@lemmy.world 3 points 1 year ago (1 children)

Thanks all working again. Had to clear my browser cache in order to login again and had to resign in to memmy too.

I guess its early days for lemmy for incidents like this, fingers crossed something like this doesn't happen again :)

[–] sab@kbin.social 3 points 1 year ago

It's a nice reminder that those with the skills but not the bad intentions would be welcome to look through the source code for vulnerabilities and report/patch anything they might find. :)

[–] Simodeus@lemmy.world 3 points 1 year ago* (last edited 1 year ago) (1 children)

It seems that I lost all my subs. There were not many but still annoying.

E: Still subbed but can't see those in Voyager.

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[–] aqua@lemmy.world 3 points 1 year ago (10 children)

Should I change passwords or no?

[–] hyorvenn@lemmy.world 3 points 1 year ago (1 children)

If you have to ask, just change it. It's free and quick, and it's good practice.

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[–] Kyoyeou@lemmy.world 3 points 1 year ago (2 children)

May I ask was is the JWS coockinand if it is automatically changed or if we have to change it in a way?

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[–] ReepusVanguard@lemmy.dbzer0.com 3 points 1 year ago (1 children)

My main is locked up and it sucks, i hope this all gets fixed.

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[–] JohnDolt@lemmy.world 3 points 1 year ago

Good shit! Thanks for keeping things up and the pretty quick response as well.

Damnit, spez.

[–] Saad07@lemmy.world 3 points 1 year ago

So that was why the logo and name was changed to israel. And for some reason getting redirected to a gif that was from lemmy

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