CVE-2023-32678 Missing authorization in zulip

Medium 6.5 Published 25 Aug 2023 Updated 30 Sep 2024

Former subscribers to private streams can edit, move, or delete messages they previously accessed, violating access controls.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-32678?

CVE-2023-32678 is a medium-severity missing authorization vulnerability in zulip, published on 25 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.

Weakness: CWE-285

Which versions are affected by CVE-2023-32678?

It affects 1 product.

Products include Zulip Zulip Server.

How do I fix CVE-2023-32678?

No fix has been published for CVE-2023-32678 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2023-32678 being exploited?

There is no known exploitation of CVE-2023-32678 in the wild and no public exploit code.

Sources

Also known as GHSA-q3wg-jm9p-35fj.