this post was submitted on 10 Jul 2023
419 points (98.6% liked)

Programming.dev Meta

2488 readers
3 users here now

Welcome to the Programming.Dev meta community!

This is a community for discussing things about programming.dev itself. Things like announcements, site help posts, site questions, etc. are all welcome here.

Links

Credits

founded 2 years ago
MODERATORS
snowe
Ategon
419
FYI: Lemmy.world and other instances were hacked. Beehaw.org took itself down to mitigate risks (lemmy.world)
submitted 1 year ago* (last edited 1 year ago) by varsock to c/meta
88 comments fedilink hide all child comments
 

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.

you are viewing a single comment's thread
view the rest of the comments
[–] tiny_fingers 59 points 1 year ago (2 children)

Security is crazy hard and having perfect security is impossible. Kudos to the dev team for resolving this so quickly.

[–] [email protected] 13 points 1 year ago

It makes me think I should see about contributing. I'm not an expert in security flaws or pen testing, but having an extra set of eyes checking for vulnerabilities doesn't hurt.

Plus, in my experience, the vulnerabilities to watch out for are code that the developers didn't write. Updating packages usually isn't a problem until it's discovered a major version update is necessary looks at Spring angrily

[–] malloc 1 points 1 year ago

In my opinion, the project would benefit from static vulnerability scanning. Low hanging fruit like this XSS would have definitely been flagged.

Most of those providers even give it out for free for open source projects. So it wouldn’t hurt.