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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[–] sarsaparilyptus@lemmy.fmhy.ml 32 points 1 year ago (1 children)

This comment is so idiotic that its least stupid explanation is that it's a false flag by a tankie to make their critics look like idiots.

[–] Speculater@lemmy.world 3 points 1 year ago (1 children)

Jesus, how deep does this conspiracy go!

[–] gravitas_deficiency@sh.itjust.works 1 points 1 year ago

Ooohhhhh… it’s IN the computer…