this post was submitted on 10 Jul 2023
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321
Lemmy.world and another instance have been compromised (lemdro.id)
submitted 1 year ago by [email protected] to c/[email protected]
80 comments fedilink hide all child comments
 

cross-posted from: https://lemmy.ml/post/1895271

FYI!!! In case you start getting re-directed to porn sites.

Maybe the admin got hacked?

edit: lemmy.blahaj.zone has also been hacked. beehaw.org is also down, possibly intentionally by their admins until the issue is fixed.

Post discussing the point of vulnerability: https://lemmy.ml/post/1896249

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[–] [email protected] 33 points 1 year ago* (last edited 1 year ago) (3 children)

Some information I have posted to Lemmy.World:

I am not a super code-literate person so bare with me on this... But. Still please becareful. There appears to be a vulnerability.

Users are posting images like the following:

https://imgur.com/a/RS4iAeI

And inside hidden is JavaScript code that when executed can take cookie information and send it to a URL address.

Among other things. At this time if you see an image please click the icon circled before clicking the link. DO NOT CLICK THE IMAGE. If you see anything suspicious, please report it immediately. It is better a false report than a missed one.

I have seen multiple posts by these people during the attack. It is most certainly related to JS.

[–] [email protected] 19 points 1 year ago* (last edited 1 year ago) (1 children)

If it's onload then simply viewing the image runs that script. Yikes.

[–] [email protected] 14 points 1 year ago (1 children)

That's even worse, if Lemmy has a vulnerability like that it needs to get fixed ASAP... Also if that code actually works, I am going to have to secure my account.

[–] [email protected] 15 points 1 year ago* (last edited 1 year ago) (2 children)

I'd wager you're likely fine if you're using a mobile app when the affected image loads. Also, it appears they're stealing auth tokens.. not passwords or anything. At worst they could impersonate you until your token expires.. but you're not a high value target unless you're an admin of an instance.

[–] [email protected] 12 points 1 year ago (1 children)

I used Firefox... So I definitely reset my password. Thing is I do not see an option for Lemmy where you can "sign out everywhere" which is the counter to Auth token stealing.

So I had to change it so that the Auth token would expire. Whilst I am not an admin I won't take the chance. It could compromise other users and I do not want to take that risk.

[–] [email protected] 6 points 1 year ago

Apparently the fix for the vulnerability signs everyone out.

[–] [email protected] 5 points 1 year ago* (last edited 1 year ago) (1 children)

the thing is right now lemmy by defaultNEVER expires the tokens... oops. Right now servers are manually expiring all their user's tokens by changing the secret in the database because of this attack.

[–] [email protected] 4 points 1 year ago

Oops indeed. Lemmy needs a security audit 😬

[–] [email protected] 3 points 1 year ago (2 children)

lmao I'm so stupid I pressed on that image and now my account is compromised. oh well it forced to create another and this is my first hack yayyyyy!

[–] [email protected] 9 points 1 year ago

Clicking the image isn't the issue, scrolling by it will nab your Auth tokens. Resetting your password will reset the Auth tokens protecting your account. A sign out everywhere button would fix it but that isn't an option yet. It really needs to be.

[–] [email protected] 8 points 1 year ago

There's so many things wrong with this I don't even know where to start