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.
With the JWT secret rotation, shouldn’t everyone be forced to re-login? I’m posting with my existing session without any changes.
Thanks Ruud for fixing it! Just a reminder guys that If you are using a third party app you need to login again.
what steps are being taken to ensure it doesn’t happen again? was any personal data compromised for users?
Would it be a good idea to force a login if the users IP or device suddenly changes?
Pardon the ignorance, but how do I know if I was compromised? what do?
