Lemmy.world and other instances hacked - Lemmy.World
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.

  • FBelaza@lemm.eeEnglish
    1·
    1 year ago

    I’m greatly surprised how Lemmy and the fediverse society has responded with this. The bug was found yesterday, maybe? And I’ve read about it three, four times (in different servers); a temporal solution was published in hours and it’s already patched on the repo.

    Another victory for Open Source and the Fediverse in general.

  • bioemerl@kbin.social
    0·
    1 year ago

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

    Use kbin instead.

    And this is not me saying that this is a case of that, this is me saying that this could be the case in the future

    • apis@kbin.social
      0·
      1 year ago

      Tbf, there are far more pressing reasons for distrusting Tankies… Instances getting hacked is for sure aggravating, but it isn’t the gulag-backed paranoid ultra-corrupt authoritarian hellhole they so admire and wish to expand globally.