Improper access control in Zulip Server - CVE-2022-21706
Published: February 28, 2022
Vulnerability identifier: #VU60897
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-21706
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to a reusable invitation link can be used to join a different organization than the one it was created for. A remote user can join an organization without an invitation and gain elevated pririvleges.
Affected software
Zulip Server
How to mitigate CVE-2022-21706
Install updates from vendor's website.
Zulip Server - update to 4.10
External References
- https://github.com/zulip/zulip/security/advisories/GHSA-6xmj-2wcm-p2jc
- https://blog.zulip.com/2022/02/25/zulip-cloud-invitation-vulnerability/
- https://github.com/zulip/zulip/commit/88917019f03860609114082cdc0f31a561503f9e
- https://blog.zulip.com/2022/02/25/zulip-server-4-10-security-release/#cve-2022-21706