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€“] [email protected] 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€“] [email protected] 9 points 1 year ago (2 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.

[โ€“] [email protected] 7 points 1 year ago (1 children)

If you run the instance only for yourself then I'd say it makes you an unattractive target. Why do a lot of work to hack an instance with one user?

But yeah, since Lemmy's code is not super mature there'll be some pains in the short term.

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[โ€“] [email protected] 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€“] [email protected] 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€“] [email protected] 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€“] [email protected] 8 points 1 year ago

Rock on, Rudd.

[โ€“] [email protected] 8 points 1 year ago

Must have been jealous spez

[โ€“] [email protected] 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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[โ€“] [email protected] 8 points 1 year ago (2 children)

Thanks for the transparency. Was having issues with Lemmy, now seems everything back to normal. Got a question, Just to add an extra layer of security, Do i need to use ToR or VPN with Lemmy ?

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[โ€“] [email protected] 6 points 1 year ago

Excellent, thanks for the quick response ruud and admins.

[โ€“] [email protected] 6 points 1 year ago* (last edited 1 year ago)

Here's a relevant post that talked about this with @[email protected] 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.

[โ€“] [email protected] 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 :)

[โ€“] [email protected] 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. :)

[โ€“] [email protected] 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?

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