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 👑

With the JWT secret rotation, shouldn't everyone be forced to re-login? I'm posting with my existing session without any changes.

Rock on, Rudd.

Ugh, people should not go after systems trying to give a free service to the internet. It just ruins everything.

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?

Seem to have a hard time loging in

Is it possible cookies for other websites were scraped? I was logged in to .world at the time; I have logged out of all accounts, and reset passwords as a precaution, but want to know if I should be on the lookout from this.

A lot of images seems to be gone from posts in /c/pics is this related to the hack or the cleanup after?

I found this in my private messages, when an attack was happening I messaged the guy “are you ok” and he replied back to me with an image of my own message… I wonder if this was similar to what was done here? Was 8 days ago

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.

Thank the heavens the meme community stayed safe through this without my daily dose of cybersecurity memes idk how I would function ;)

Occasional cookie deletions I understand, but will sign-ins persist in the future?

Thanks Ruud for fixing it! Just a reminder guys that If you are using a third party app you need to login again.

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 :)

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.

I had an issue of being logged out of my account and could not log back in, after closing and reopening the site, closing browser, etc until I cleared my cookies, then it let me back in. If that helps anyone.

So what happened:

• Someone posted a post.
• The post contained some instruction to display custom emoji.
• So far so good.
• There is a bug in JavaScript (TypeScript) that runs on client's machine (arbitrary code execution?).
• The attacker leveraged the bug to grab victim's JWT (cookie) when the victim visited the page with that post.
• The attacker used the grabbed JWTs to log-in as victim (some of them were admins) and do bad stuff on the server.

Am I right?

I'm old-school developer/programmer and it seems that web is peace of sheet. Basic security stuff violated:

• User provided content (post using custom emojis) caused havoc when processing (doesn't matter if on server or on client). This is lack of sanitization of user-provided-data.
• JavaScript (TypeScript) has access to cookies (and thus JWT). This should be handled by web browser, not JS. In case of log-in, in HTTPS POST request and in case of response of successful log-in, in HTTPS POST response. Then, in case of requesting web page, again, it should be handled in HTTPS GET request. This is lack of using least permissions as possible, JS should not have access to cookies.
• How the attacker got those JWTs? JavaScript sent them to him? Web browser sent them to him when requesting resources form his server? This is lack of site isolation, one web page should not have access to other domains, requesting data form them or sending data to them.
• The attacker logged-in as admin and caused havoc. Again, this should not be possible, admins should have normal level of access to the site, exactly the same as normal users do. Then, if they want to administer something, they should log-in using separate username + password into separate log-in form and display completely different web page, not allowing them to do the actions normal users can do. You know, separate UI/applications for users and for admins.

Am I right? Correct me if I'm wrong.

Again, web is peace of sheet. This would never happen in desktop/server application. Any of the bullet points above would prevent this from happening. Even if the previous bullet point failed to do its job. Am I too naïve? Maybe.

Marek.

Thanks for the quick reaction and TRANSPARENCY!!