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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[–] [email protected] 6 points 1 year ago

Thank you for taking the time to update this :) Hope everything will be sorted out without people being scared. As a layman, was any user data compromised?

[–] [email protected] 6 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 :)

[–] [email protected] 6 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. :)

[–] [email protected] 5 points 1 year ago* (last edited 1 year ago)

Thanks for the info, Ruud. I just put in for a monthly donation to you all -- I appreciate you.

[–] [email protected] 5 points 1 year ago (3 children)

Poor beehaw.org is still down

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[–] [email protected] 5 points 1 year ago (1 children)

Well that's just great it really is a shame though how some people would actively want to ruin something free like this just because they can.

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[–] [email protected] 5 points 1 year ago

Congratulations everyone on the quick fix/mitigation!

[–] [email protected] 5 points 1 year ago (1 children)

Testing… I have to keep trying this because memmy is being a dick.

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[–] [email protected] 5 points 1 year ago (4 children)

I found this in my private messages, when an attack was happening I messaged the guy β€œare you ok” and he replied back to me with an image of my own message… I wonder if this was similar to what was done here? Was 8 days ago

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[–] [email protected] 5 points 1 year ago

Had to re-login in the Connect app

[–] [email protected] 5 points 1 year ago* (last edited 1 year ago)

TY to everyone itt who commented on how to fix the 3rd party app issues.

I was panicking when liftoff went wonky

[–] [email protected] 5 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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[–] [email protected] 5 points 1 year ago (1 children)

A lot of images seems to be gone from posts in /c/pics is this related to the hack or the cleanup after?

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[–] [email protected] 5 points 1 year ago (6 children)

Would it be a good idea to force a login if the users IP or device suddenly changes?

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[–] [email protected] 5 points 1 year ago (2 children)

What are the risks for people who use Jerboa for Lemmy? I logged put and back in and there doesn't seem to be any issues, so are the app users excluded from this?

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[–] [email protected] 5 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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