Asklemmy

43945 readers

604 users here now

A loosely moderated place to ask open-ended questions

Search asklemmy 🔍

If your post meets the following criteria, it's welcome here!

Open-ended question
Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
Not ad nauseam inducing: please make sure it is a question that would be new to most members
An actual topic of discussion

Looking for support?

Looking for a community?

Lemmyverse: community search
sub.rehab: maps old subreddits to fediverse options, marks official as such
!lemmy411@lemmy.ca: a community for finding communities

~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~

founded 5 years ago

MODERATORS

252

What are these comments on lemmy posts? (lemmy.sdf.org)

submitted 1 year ago by Fleecer74@lemmy.sdf.org to c/asklemmy@lemmy.ml

85 comments fedilink hide all child comments

Are they just an issue with wefwef or trying to use an exploit

you are viewing a single comment's thread
view the rest of the comments

[–] Dirk@lemmy.ml 14 points 1 year ago (1 children)

Also, strict CSP would prevent it entirely.

[–] Xylight@lemmy.xylight.dev 4 points 1 year ago (1 children)

out of curiosity, what CSP options would fix this?

[–] Dirk@lemmy.ml 13 points 1 year ago

To prevent execution of scripts not referenced with the correct nonce:

script-src 'self' 'nonce-$RANDOM'

To make it super strict, this set could be used:

default-src 'self';
script-src 'nonce-$RANDOM'
object-src 'none';
base-uri 'none';
form-action 'none';
frame-ancestors 'none';
frame-src 'none';
require-trusted-types-for 'script'

Especially the last one might cause the most work, because the "modern web development environment" simply cannot provide this. Also: form-action 'none'; should be validated. It should be set to self if forms are actually used to send data to the server and not handled by Javascript.

The MDN has a good overview: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy