While I was asleep, apparently the site was hacked. Luckily, (big) part of the lemmy.world team is in US, and some early birds in EU also helped mitigate this.
As I am told, this was the issue:
- There is an vulnerability which was exploited
- Several people had their JWT cookies leaked, including at least one admin
- Attackers started changing site settings and posting fake announcements etc
Our mitigations:
- We removed the vulnerability
- Deleted all comments and private messages that contained the exploit
- Rotated JWT secret which invalidated all existing cookies
The vulnerability will be fixed by the Lemmy devs.
Details of the vulnerability are here
Many thanks for all that helped, and sorry for any inconvenience caused!
Update While we believe the admins accounts were what they were after, it could be that other users accounts were compromised. Your cookie could have been 'stolen' and the hacker could have had access to your account, creating posts and comments under your name, and accessing/changing your settings (which shows your e-mail).
For this, you would have had to be using lemmy.world at that time, and load a page that had the vulnerability in it.
What's the difference? JWT is already cryptographically signed, but tokens were stolen. That's the issue.
PGP private keys are harder to steal than JWTs, as they are not generally stored as a long-term cookie but briefly just to sign something. Through XSS (the vulnerability in this case), cookies are relatively easy to steal, but to steal a PGP key would require a more complex script able to steal the key at the time it is loaded in the browser (assuming the signing feature is implemented in the browser). It's a bit more sophisticated, but not totally bulletproof.
First of all, it's still possible, as you said. Second, we must always take humans into consideration. Let me explain.
Most people don't know what PGP is, thus you can sign your posts with any crap and most won't care.
Out of those who know what PGP is and how to use it, most won't be checking the posts as they will auto-assume that if it's signed - it's ok.
There will be a small minority of those who care, but they can be silenced easily through social engineering.
It is possible to integrate server side signature checks, but then again you're vulnerable when someone gains unrestricted access to your account.
The correct solution requires multiple features to be implemented.
Agree with the points on PGP and other features. I almost made a lengthier reply mentioning the signing issues, which seems appropriate now. It would not be easy, but a successful implementation would definitely need clients to automatically detect and verify signed content, due to the human issues you mention. A problem is obtaining public keys from a trusted source. Maybe it could be attached to profile information with a 2FA requirement to modify it. Just an idea. In this way, verification is not dependent on the user to perform.