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

Must have been jealous spez

[โ€“] Autumbloom@lemmy.world 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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Rock on, Rudd.

[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.

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

afaik, exploit does not pass through federation. but you should change your password just in case.

it doesn't and probably cannot infect your device

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[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€“] dorumon@lemmy.world 7 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€“] SnowGlobal@lemmy.world 6 points 1 year ago

Excellent, thanks for the quick response ruud and admins.

[โ€“] 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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[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€“] 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 :)

[โ€“] 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. :)

[โ€“] 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.

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