this post was submitted on 10 Jul 2023
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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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[–] xylogx@lemmy.world 6 points 1 year ago (2 children)

I noticed this morning for a small amount of my posts with pictures, maybe 5-10%, the pictures were deleted or missing. Not sure if this is related to the incident.

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[–] SnowGlobal@lemmy.world 6 points 1 year ago

Excellent, thanks for the quick response ruud and admins.

[–] adamlc@lemmy.world 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 :)

[–] sab@kbin.social 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. :)

[–] aussiematt@lemm.ee 6 points 1 year ago (2 children)

It seems there is no way in Lemmy to invalidate all your session cookies? Without that, how can you secure an account which has a stolen session cookie?

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[–] debeluhar@lemmy.world 6 points 1 year ago (1 children)

I wasn't using webpage, I was only using mobile app (Connect). Could my coockie be also stolen that way or was that only possible on webpage?

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[–] TheVampireSaga@lemmy.world 6 points 1 year ago* (last edited 1 year ago)

Here's a relevant post that talked about this with @AlmightySnoo@lemmy.world I think is worth looking into for anyone curious what exactly happened.

https://sh.itjust.works/post/923025

please don't visit the legal section of the website or anything confirmed compromised if anything.

[–] Uncle_Iroh@lemmy.world 6 points 1 year ago

You guys are quick!

[–] alaxitoo@lemmy.world 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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[–] wildcelt@lemmy.world 5 points 1 year ago (3 children)

Poor beehaw.org is still down

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[–] ludw@lemmy.world 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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[–] Magiwarriorx@lemmy.world 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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[–] Monochromepsychward@lemmy.world 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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Damnit, spez.

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