this post was submitted on 10 Jul 2023

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Lemmy.world (and some others) were hacked (lemmy.world)

submitted 2 years ago* (last edited 2 years ago) by ruud@lemmy.world to c/lemmyworld@lemmy.world

715 comments fedilink hide all child comments

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.

(page 5) 50 comments

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[–] tamal3@lemmy.world 5 points 2 years ago* (last edited 2 years ago)

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

[–] CascadianBeam@lemmy.world 5 points 2 years ago (1 children)

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

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[–] DarkSpectrum@lemmy.world 5 points 2 years ago

Had to re-login in the Connect app

[–] ludw@lemmy.world 5 points 2 years 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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[–] xandowsk@lemmy.world 5 points 2 years ago

Congratulations everyone on the quick fix/mitigation!

[–] kluevo@lemmy.world 5 points 2 years ago* (last edited 2 years ago)

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

I was panicking when liftoff went wonky

[–] alaxitoo@lemmy.world 5 points 2 years ago (4 children)

I found this in my private messages, when an attack was happening I messaged the guy “are 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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[–] Monochromepsychward@lemmy.world 5 points 2 years 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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[–] Pillarist@lemmy.world 5 points 2 years 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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[–] Uncle_Iroh@lemmy.world 5 points 2 years ago

You guys are quick!

[–] itsdavetho@lemmy.world 5 points 2 years 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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[–] Magiwarriorx@lemmy.world 5 points 2 years 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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[–] wildcelt@lemmy.world 5 points 2 years ago (3 children)

Poor beehaw.org is still down

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