Auth bypass in Zulip
CVE-2024-21630
Zulip is an open-source team collaboration tool. A vulnerability in version 8.0 is similar to CVE-2023-32677, but applies to multi-use invitations, not single-use invitation links as in the prior CVE. Specifically, it applies when the installation has configured non-admins to be able to invite users and create multi-use invitations, and has also configured only admins to be able to invite users to streams. As in CVE-2023-32677, this does not let users invite new users to arbitrary streams, only to streams that the inviter can already see. Version 8.1 fixes this issue. As a workaround, administrators can limit sending of invitations down to users who also have the permission to add users to streams.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Zulip — versions = 8.0
- Zulip Server
Weakness classification (CWE)
References
- github.com/zulip/zulip/security/advisories/GHSA-87p9-wprh-7rm6 (Vendor Advisory)
- github.com/zulip/zulip/security/advisories/GHSA-mrvp-96q6-jpvc (Vendor Advisory)
- github.com/zulip/zulip/commit/0df7bd71f32f3b772e2646c6ab0d60c9b610addf (Patch)
- zulip.com/help/configure-who-can-invite-to-streams (Product)
- zulip.com/help/restrict-account-creation (Product)
Frequently asked questions
- What is CVE-2024-21630?
- CVE-2024-21630 is a medium-severity vulnerability in Zulip, classified under Missing Authorization. CVSS score: 4.3/10. Published 2024-01-25.
- How severe is CVE-2024-21630?
- Medium severity. CVSS v3 base score is 4.3 out of 10.