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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[–] stink_pickle@lemmy.world 4 points 1 year ago* (last edited 1 year ago) (1 children)

Um, probably coincidence or a false posi, but malwarebytes is labeling lemmy.~~world~~today as being compromised / malicious when following external links, it's only popped up twice, but here's a slightly redacted log file:

-Log Details- Protection Event Date: 7/10/23 Protection Event Time: 1:24 PM

-Software Information- Version: 4.5.33.272 Components Version: 1.0.2069 Update Package Version: 1.0.72209 License: Premium

-System Information- OS: Windows 11 (Build 22621.1928) CPU: x64 File System: NTFS User: System

-Blocked Website Details- Malicious Website: 1 , C:\Program Files\Google\Chrome Beta\Application\chrome.exe, Blocked, -1, -1, 0.0.0, ,

-Website Data- Category: Compromised Domain: lemmy.today

(end)

[–] Gestrid@lemmy.ca 3 points 1 year ago (1 children)

That mentions lemmy.today, not lemmy.world.

[–] stink_pickle@lemmy.world 4 points 1 year ago

thank you for the heads up, still getting used to instances

[–] Kyoyeou@lemmy.world 4 points 1 year ago (2 children)

May I ask was is the JWS coockinand if it is automatically changed or if we have to change it in a way?

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[–] zaggynl@lemmy.world 4 points 1 year ago

That explains why I had to clear my browser cache, I was unable to login until I did.

[–] PolarBone@lemmy.world 4 points 1 year ago* (last edited 1 year ago) (1 children)

I’ve been unable to login on desktop since this happened. Only been able to login via Memmy on IOS.

I put in my info and it kicks me back to the front page and doesn’t log me in.

I’ve tried clearing cache too

EDIT: Switching browser to Edge seemed to let me. Weird. Even reinstalled Firefox and still won't let me.

[–] NausetJF@lemmy.world 3 points 1 year ago (2 children)

I appreciate the transparency. Hopefully with more eyes on the source code hacks like this will not happen again.

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[–] V4uban@lemmy.world 3 points 1 year ago

Thank you for your fast answer!

[–] aqua@lemmy.world 3 points 1 year ago (10 children)

Should I change passwords or no?

[–] hyorvenn@lemmy.world 4 points 1 year ago (1 children)

If you have to ask, just change it. It's free and quick, and it's good practice.

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[–] TWeaK@lemm.ee 3 points 1 year ago (1 children)

Is a password change advised? How does the JWT cookie and exploit effect apps eg Jerboa?

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[–] binary45@lemmy.world 3 points 1 year ago (2 children)

Is that why I got logged off?

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[–] Simodeus@lemmy.world 3 points 1 year ago* (last edited 1 year ago) (1 children)

It seems that I lost all my subs. There were not many but still annoying.

E: Still subbed but can't see those in Voyager.

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[–] JohnDolt@lemmy.world 3 points 1 year ago

Good shit! Thanks for keeping things up and the pretty quick response as well.

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