#VU86274 Improper Privilege Management in Zulip Server - CVE-2024-21630

Vulnerability identifier: #VU86274

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-21630

CWE-ID: CWE-269

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zulip Server
Web applications / Other software

Vendor: Zulip

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to improper privilege management when handling multi-use invitations. A remote user can bypass security restrictions and invite users to stream they should not be able to access otherwise.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 8.0

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External links
https://github.com/zulip/zulip/security/advisories/GHSA-87p9-wprh-7rm6
https://github.com/zulip/zulip/security/advisories/GHSA-mrvp-96q6-jpvc
https://github.com/zulip/zulip/commit/0df7bd71f32f3b772e2646c6ab0d60c9b610addf
https://zulip.com/help/configure-who-can-invite-to-streams
https://zulip.com/help/restrict-account-creation#change-who-can-send-invitations

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.