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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[โ€“] [email protected] 32 points 1 year ago* (last edited 1 year ago) (2 children)

Had to clear my browser catch to log in, Jerboa still shows as not logged in even after logging out which you do by clicking the hamburger menu then click the top banner to change/log out of accounts. This post is a test to see if my account works again via browser lol.

Edit: clearing app data/cache for Jerboa fixed the login issue.

[โ€“] [email protected] 5 points 1 year ago (3 children)

Thanks for this comment, I had to wipe cache and cookies to login on desktop. Wasn't sure what was preventing me from logging in.

[โ€“] [email protected] 3 points 1 year ago (1 children)
[โ€“] [email protected] 1 points 1 year ago (1 children)
[โ€“] [email protected] 2 points 1 year ago

Thanks that worked :)

[โ€“] [email protected] 1 points 1 year ago (1 children)

Still not working for me with my lemmy.world account in desktop browser.

[โ€“] [email protected] 1 points 1 year ago

Looks like 3rd time deleting all lemmy.world browser was the charmed one.