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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[โ€“] Legendsofanus@lemmy.world 9 points 1 year ago

This is so sad lmao rip. With any site growing as fast as these instances (because of the Reddit folk) Ig these attacks are to be expected. Hope everyone's accounts and personal info are okay

[โ€“] WhoRoger@lemmy.world 9 points 1 year ago (4 children)

Interesting.

Attackers started changing site settings and posting fake announcements etc

So at least that wasn't 100% malicious, otherwise they could've kept the vuln hidden and just collect data and whatnot.

On the other hand, who cared enough about Lemmy to hack it? Weird.

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[โ€“] 00Xero00@lemmy.world 9 points 1 year ago* (last edited 1 year ago) (2 children)

I can't log into my account anymore, this one is a new one I've just made. I tried to reset my password but nothing came in the mailbox. I can still see comments and posts from that account though.

It's this one:

And I don't know why but I can't save the profile pic for this account.

Edit: Nvm, I use another email to sign up for Lemmy and forgot about it

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[โ€“] iMike@lemmy.world 9 points 1 year ago

Must have been jealous spez

As someone in EU I didn't even realized there was an issue. Well done and great reaction time! Also thank you for the transparency ๐Ÿ‘‘

[โ€“] godless@lemmy.world 8 points 1 year ago (2 children)

With the JWT secret rotation, shouldn't everyone be forced to re-login? I'm posting with my existing session without any changes.

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[โ€“] 001100010010@lemmy.dbzer0.com 8 points 1 year ago (2 children)

If I'm not from lemmy.world and visited a lemmy.world community via my home instance, does the hacker gain access to my account?

If I, while logged in to my home instance, accessed lemmy.world in another tab, does the hacker gain access to my account?

Does this hack infect devices used to access lemmy.world?

Sorry for noob questions, I'm just worried.

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[โ€“] dorumon@lemmy.world 8 points 1 year ago (1 children)

Well that's just great it really is a shame though how some people would actively want to ruin something free like this just because they can.

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Rock on, Rudd.

[โ€“] possiblylinux127@lemmy.zip 7 points 1 year ago (1 children)

This seems way worse than they are making it sound.

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[โ€“] Reliant1087@lemmy.world 6 points 1 year ago

Thank you for taking the time to update this :) Hope everything will be sorted out without people being scared. As a layman, was any user data compromised?

[โ€“] 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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