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PSA: Lemmy.world was compromised! (infosec.pub)

submitted 1 year ago* (last edited 1 year ago) by henfredemars@infosec.pub to c/infosecpub@infosec.pub

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Discussion from here: https://lemmy.ml/post/1895271

Relevance: Infosec.pub may wish to consider defederation temporarily.

Temporary fix in place, but instances remain vulnerable. Post: https://lemmy.world/post/1290412

UPDATE 2:58 UTC the injected code was removed from the main page, but cleanup efforts are still underway.
UPDATE 3:11 UTC situation appears to be under control, but browse with caution.
UPDATE 3:35 UTC main page exploited again! Website is unsafe.
UPDATE 4:01 UTC reports coming in that other instances are getting owned. One report of comments trying to inject JavaScript into the page.
UPDATE 4:13 UTC XSS vulnerability in page sidebar is reported relationship to the event is unknown.
UPDATE 7:17 UTC Root cause was identified a while ago.

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[-] henfredemars@infosec.pub 2 points 1 year ago* (last edited 1 year ago)

Correct. We don't know for sure what the initial injection was, but they did manage to inject and all the accounts will need their sessions purged maybe force password reset as well.

EDIT: No longer correct -- the injection appears to have been through custom emojis in markdown, see github for details.

this post was submitted on 10 Jul 2023

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