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€“] 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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[โ€“] chokidar@lemmy.world 2 points 1 year ago

Well done on acting on it so quickly. I think I did see some of the fake announcements you were referring too but were taken down very quickly. Keep up the good work team and thanks for everything you are doing!

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

Is this why I had to sign in and out of my account on liftoff?

I couldn't comment untill I did that. There may be others!

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[โ€“] downpunxx@lemmy.world 2 points 1 year ago

******* This happened to me, one of my posts had it's photo deleted (I didn't delete it), then when I replaced it, the next time I checked the entire post had been deleted.

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

I lost some of my post history. Is there a data issue that's come from this? Why are my comments gone?

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[โ€“] weeahnn@lemmy.blahaj.zone 2 points 1 year ago (1 children)

is that why I can't log into my lemmy.world account?

[โ€“] weeahnn@lemmy.world 2 points 1 year ago

ok not a problem anymore. seems like I just had to clear my cache and it let me log in

[โ€“] TWeaK@lemm.ee 2 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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[โ€“] sheetmysharts@lemmy.world 2 points 1 year ago

Thanks to everyone involved for the quick response ๐Ÿ‘

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

Is there a rough time range when it happened? and any news about other big instances like lemmy.ml? Are those safe? Currently they are not on the same version as lemmy.world.

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[โ€“] gabriele97@lemmy.g97.top 2 points 1 year ago (1 children)

How are you preventing it to happen again until a patch is released from devs?

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[โ€“] ulu_mulu@lemmy.world 2 points 1 year ago

Amazing how you quickly reacted to this!! Bravo!!

TIP: if you can't login after what happened, clear out your browser cache including ALL cookies, that fixes it (it did for me at least). I believe it's also advisable to change lemmy password.

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

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

You need to delete all cookies for lemmy.world in your browser, then log in again.

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[โ€“] Nomadic@lemmy.world 2 points 1 year ago

Maybe there needs to be a quick rundown how to actually log out and in on clients, seems you can't with jerboa without just wiping the app, and wefwef, you need to delete all accounts.

I see some instances are throwing server errors

[โ€“] Tom2day@lemmy.world 2 points 1 year ago
[โ€“] TrismegistusMx@lemmy.world 2 points 1 year ago (2 children)

Is this why I can't log in on Chrome? I switched to Firefox and it worked.

[โ€“] Thomas_Ladder69@lemmy.world 2 points 1 year ago (2 children)

No. This was during a pretty specific time yesterday night.

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[โ€“] ninekeysdown@lemmy.world 2 points 1 year ago

Great job everyone! Keep it up! Love the transparency!

[โ€“] jpants@lemmy.fmhy.ml 2 points 1 year ago

I see you, Imposter.

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