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 [email protected] to c/[email protected]

720 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 6) 50 comments

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[–] [email protected] 4 points 2 years ago (1 children)

Seem to have a hard time loging in

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[–] [email protected] 4 points 2 years ago

You guys are quick!

[–] [email protected] 4 points 2 years ago

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

[–] [email protected] 4 points 2 years ago* (last edited 2 years 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.

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[–] [email protected] 4 points 2 years ago* (last edited 2 years ago) (2 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)

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[–] [email protected] 4 points 2 years ago (1 children)

Not too promising, hopefully it's fixed quickly.

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[–] [email protected] 4 points 2 years 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] 4 points 2 years ago

Thanks for the quick reaction and TRANSPARENCY!!

[–] [email protected] 4 points 2 years ago

I hope devs will examine all parts of the code that display content to make sure proper sanitization

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