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€“] gsdsam@lemmy.world 12 points 1 year ago (8 children)

Could admins sign announcements with a PGP key to mitigate false admin posts and the consequences this might have? Or is this no longer necessary?

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[โ€“] slowcurrent@sh.itjust.works 12 points 1 year ago (1 children)

How do we know you're the real you? This all could be part of the plan!

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[โ€“] fikran@thebag.social 12 points 1 year ago

Ugh, people should not go after systems trying to give a free service to the internet. It just ruins everything.

[โ€“] TrickyCamel@lemmy.world 12 points 1 year ago

Thanks for the transparency.

Great lemmies! Thanks for uniting us.

[โ€“] eluri@lemmy.world 11 points 1 year ago (6 children)

Soo it looks like the entry for this instance was also changed on https://lemmyverse.net/ . At least I hope it is the hack

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[โ€“] mintiefresh@lemmy.ca 11 points 1 year ago

Thanks for the great work. The response time was awesome, considering you were asleep as well.

[โ€“] PagingDoctorLove@lemmy.world 11 points 1 year ago (5 children)

Can I ask some possibly dumb questions?

  1. What is JWT?
  2. Was any private user data compromised, and if so will users be informed?
  3. Is there anything regular users can do to avoid their data being compromised? For example, not accessing lemmy on certain web browsers?

Thank you!

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[โ€“] cheeseblintzes@lemmy.world 11 points 1 year ago (1 children)

Once again, thank you guys for all that you do. As many other people are saying, appreciate the transparency about these things.

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[โ€“] Tuesdays@lemmy.world 11 points 1 year ago (4 children)

I had to create a new account. I tried enabling 2FA on my main account a week ago, but was never able to generate a token. Now when I try logging in it is asking for my 2FA token. Is there any way to get my account back. I'm a moderator of a community.

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[โ€“] hal_5700X@lemmy.world 11 points 1 year ago (1 children)

Thanks for the transparancy about this.

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[โ€“] ColleenLawson@lemmy.world 11 points 1 year ago (1 children)

Yah, I noticed my Lemmies auto-corrupted to Lemurs.

I don't care. I'm keeping it.

Lemurs are cute.

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[โ€“] feedum_sneedson@lemmy.world 10 points 1 year ago (11 children)

I can only log in on incognito mode, which makes me think my cookie has been stolen or whatever. So my question is, what should I be doing about that?

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[โ€“] LeHappStick@lemmy.world 9 points 1 year ago (11 children)

Pardon the ignorance, but how do I know if I was compromised? what do?

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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€“] mackwinston@feddit.uk 9 points 1 year ago (3 children)

This is why I've decided against running my own Lemmy instance. Too much work to have to keep up constantly with updating, too big of an attractive target for attackers.

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[โ€“] iMike@lemmy.world 8 points 1 year ago

Must have been jealous spez

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

One thing I don't get. Custom emojis can only be created by an admin, but you're saying an admin's account here got compromised because of that and not the other way around. Does that mean that an evil instance set a custom emoji with the injected JavaScript and propagated it to the federated instances?

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Rock on, Rudd.

[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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