this post was submitted on 10 Jul 2023
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FYI: Lemmy.world and other instances were hacked. Beehaw.org took itself down to mitigate risks (lemmy.world)
submitted 1 year ago* (last edited 1 year ago) by varsock@programming.dev to c/meta@programming.dev
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Drawing attention on this instance so Admins are aware and can address the propagating exploit.

EDIT: Found more info about the patch.

A more thorough recap of the issue.

GitHub PR fixing the bug: https://github.com/LemmyNet/lemmy-ui/pull/1897/files

If your instance has custom emojis defined, this is exploitable everywhere Markdown is available. It is NOT restricted to admins, but can be used to steal an admin's JWT, which then lets the attacker get into that admin's account which can then spread the exploit further by putting it somewhere where it's rendered on every single page and then deface the site.

If your instance doesn't have any custom emojis, you are safe, the exploit requires custom emojis to trigger the bad code branch.

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[–] tal@kbin.social 0 points 1 year ago (1 children)

And this is why you don't trust tankies. It's very easy to compromise the software and put back doors into it.

This is hardly a back door. The lemmy devs just screwed up.

Use kbin instead.

Kbin had a fix for an SQL injection exploit the other week. Both probably still have security holes that haven't yet been identified.

There are more eyes on the software as the userbase grows, and people are going to find more flaws. That's just the way things go.

[–] bioemerl@kbin.social 0 points 1 year ago (1 children)

This is hardly a back door.

I literally said it wasn't in my comment, it's evidence of how easy it is to put one in down the line despite the fact this is open source software.

[–] raspberry_confetti@lemmy.ml 2 points 1 year ago

You must not understand how open source works