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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[–] nosut@lemmy.world 34 points 1 year ago* (last edited 1 year ago) (1 children)

Thanks for the work. As a heads up it appears most of the block instances are back however I believe explodingheads is still missing which you may want to confirm.

EDIT: it has been added back to the block list.

[–] Carnelian@lemmy.world 1 points 1 year ago

Hey how do you check on that?

As of the time of me posting this comment, exploding heads is appearing in my feed with some anti lgbt posts. Idk what’s going on because I’m pretty sure they’re supposed to be defederated currently