this post was submitted on 24 Jan 2024
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Lemmy Security Advisory for Versions < 0.19.1: Private message details leak. (github.com)
submitted 1 year ago* (last edited 1 year ago) by dessalines@lemmy.ml to c/announcements@lemmy.ml
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The full description of the bug is in the linked issue above, but the short version is:

Our CreatePrivateMessageReport endpoint had a bug that would allow anyone, not just the recipient, to create a report, and then receive the details about private messages.

This allowed anyone to iterate over ids, creating thousands of reports in order to receive details about private messages.

Since those reports are visible to admins, it would be easy to discover if someone was abusing this, and luckily we haven't heard of anyone doing so on production instances (so far).

If you haven't, please be sure to upgrade to at least 0.19.1 for the fix.

Many thanks to @Nothing4You for finding this one.

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[–] Blaze@discuss.online 0 points 1 year ago* (last edited 1 year ago) (2 children)

Isn't that dangerous to discose the bug while the largest version is still 18.5 ? https://fedidb.org/software/lemmy/versions

[–] gregorum@lemm.ee 0 points 1 year ago (1 children)

why haven't they upgraded yet?

[–] Blaze@discuss.online 0 points 1 year ago

19.0 and 19.1 broke federation.

19.2 restored federation.

19.3, released this week, fixed an authentication issue.

Seems you are either non-functional or insecure