CVE-2023-32677 Users who can send invitations can erroneously add users to streams during invitation in Zulip
Users with invitation permissions can bypass stream addition restrictions to add new users to streams they shouldn't control.
- 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-2023-32677?
CVE-2023-32677 is a low-severity missing authorization vulnerability in zulip, published on 19 May 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 unique topic-based threading. Zulip administrators can configure Zulip to limit who can add users to streams, and separately to limit who can invite users to the organization. In Zulip Server 6.1 and below, the UI which allows a user to invite a new user also allows them to set the streams that the new user is invited to -- even if the inviting user would not have permissions to add an existing user to streams. While such a configuration is likely rare in practice, the behavior does violate security-related controls. This does not let a user invite new users to streams they cannot see, or would not be able to add users to if they had that general permission. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may limit sending of invitations down to users who also have the permission to add users to streams.
Weakness: CWE-862
Which versions are affected by CVE-2023-32677?
It affects 1 product.
Products include Zulip Zulip.
How do I fix CVE-2023-32677?
No fix has been published for CVE-2023-32677 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-2023-32677 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32677 exists.
Other vulnerabilities in zulip
- CVE-2021-43799 RabbitMQ exposes ports with weak default secrets in Zulip Server
- CVE-2022-35962 Crafted link in Zulip message can cause disclosure of credentials
- CVE-2016-4427 Auth bypass in zulip
- CVE-2021-3866 Cross-site Scripting (XSS) - Stored in zulip/zulip
- CVE-2023-28623 Unauthorized user can register an account in specific configurations in Zulip
Sources
Also known as GHSA-mrvp-96q6-jpvc.