this post was submitted on 17 Jul 2023
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Asklemmy
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but that's not the fault of the UI, that's the fault of the server and/or operator for allowing something like that to be even theoretically possible in the first place.
This is why you place UIs on separate domains from the servers, and always treat user input like it's radioactive AND toxic.
The custom emoji's was a developed feature of Lemmy pushed out in their UI code. Even the project mainters instance was affected. Its why 0.18.2 was released.
https://join-lemmy.org/news/2023-07-11_-_Lemmy_Release_v0.18.2
Thats not on server/infra operators. It was a vuln in the core UI code. Some operators DID patch it themselves (i think Beehaw is one), others were less affected (ie: My instance is closed and i dont use custom emjis anyhow), but those are features introduced by the maintainers and some of the bigger instances would get requests for them anyhow. So it was a problem.
but the fundamental vulnerability is not in the UI, by that logic you could just run your own UI and get into servers without issue, the vulnerability is always in either the server software or in the specific deployment.
The vulnerability was in the ui.
again, that makes no sense whatsoever, by that logic anyone can just merrily wreak havoc by using a client specially made to have vulnerabilities.
It was a csrf issue. The vulnerability isn’t on the attackers side, it’s on the user’s side. I’m telling you this as the owner of the instance. I’m sorry, but you are wrong here.