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] 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)

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

That mentions lemmy.today, not lemmy.world.

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

I heard that some instances were defaced. Any examples of this? I wasn't online this noon so I never got to see any action.

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[–] [email protected] 3 points 1 year ago (4 children)

I’d like to logout, then log back in, because I can’t upvote / downvote- how do I logout? I can’t seem to find a logout button.

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

Hmm. Liftoff won't let me post but shows logged in and as a newbie be damned if I can find where to log out.

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[–] [email protected] 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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[–] [email protected] 3 points 1 year ago

Occasional cookie deletions I understand, but will sign-ins persist in the future?

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

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

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

Just for a bit of perspective -- Scary hacks like this happen all the time in the for-profit corporate world, too. They just don't tell us about it. It will continue to happen as technology constantly grows and evolves.

Praise to the Admins and Devs who play this constant game of whack-a-mole!

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[–] [email protected] 3 points 1 year ago

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

[–] [email protected] 3 points 1 year ago

So that was why the logo and name was changed to israel. And for some reason getting redirected to a gif that was from lemmy

[–] [email protected] 3 points 1 year ago (10 children)

Should I change passwords or no?

[–] [email protected] 3 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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[–] [email protected] 3 points 1 year ago

Thank you for your fast answer!

[–] [email protected] 3 points 1 year ago

Damnit, spez.

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