Lemmy.world and other instances hacked - LemmyWorld
lemmy.world
A number of Lemmy instances have been hacked overnight. Some may remain inaccessible until they have been secured and restarted. As a safety precaution logged-on sessions on many servers have been cancelled and you are required to logon again. Unfortunately, the only way I could find to do this in Liftoff! is by going to Settings > Accounts and deleting each local account by long pressing on it, and then create it again. All your posts, comments and bookmarks should be preserved during this process. Please see the linked posts for further details as they emerge. Thanks all, and please bear with us as this gets resolved.

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.

  • bioemerl@kbin.social
    25·
    1 year ago

    It’s not a backdoor. It wasn’t malicious

    Read my comment again. I literally said this wasn’t. I said this is evidence that it could be easily done in the future.

    everyone can see the code, which means everyone can spot sketchy shit - either malicious or completely accidental - and fix it.

    Didn’t help in this case. Open Source doesn’t fix malicious contributions, and when the project owners are the malicious source your have no safeguards. Trust is still essential.

    If this was a malicious exploit, it’d have been obscured far more,

    Ex-fucking-xactly

    • gravitas_deficiency@sh.itjust.worksEnglish
      2·
      1 year ago

      I’m not going to litigate the entire topic of trust within the context of software and systems engineering with you.

      This is the sort of Reddit interaction that I don’t miss.

      • bioemerl@kbin.social
        13·
        1 year ago

        “I’m going going to explain why you’re clearly wrong and I’m clearly right because that would open me up to making arguments that can actually be argued against”.

        You treat open source like it’s a magic sprinkle to get trustworthy code. It isn’t, and when malicious actors control the code base and write the majority of the code it is hilariously easy to sneak many bugs in over the years. Even projects like Linux, run by people you can actually trust, have issues with third party contributors despite incredibly rigerous approval process.

        I’m damn well aware of how this works, and you believe open source gives you security that simply does not exist.

        • gravitas_deficiency@sh.itjust.worksEnglish
          2·
          1 year ago

          OSS is not magic. Never claimed it was.

          At this point, I am no longer sure what you’re trying to argue about.

          But regardless of the knowledge you may or may not have, your comment pattern seems to be that of a troll, so you get the honor of being the first user I’m gonna block on lemmy! <3

          • philmEnglish
            3·
            1 year ago

            Haha, I came to the same conclusion, but to be fair he’s not from lemmy, he’s just a lost soul in the fediverse (nothing against kbin though) strenuously believing that the devs of lemmy have evil intent and sell us all to “communist china” lol.

          • bioemerl@kbin.social
            12·
            1 year ago

            But regardless of the knowledge you may or may not have, your comment pattern seems to be that of a troll

            Yeah. “Reddit behavior”. Coming from the guy summoning every bad faith argument they can.