#VU76394 Improper Privilege Management in Zulip Server - CVE-2023-32677

Vulnerability identifier: #VU76394

Vulnerability risk: Low

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

CVE-ID: CVE-2023-32677

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 sending invitations. A remote user can add other users to streams when they are not authorized to do so.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 1.9.0 rc1 - 6.1

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External links
https://github.com/zulip/zulip/commit/7c2693a2c64904d1d0af8503b57763943648cbe5
https://zulip.com/help/restrict-account-creation#change-who-can-send-invitations
https://github.com/zulip/zulip/security/advisories/GHSA-mrvp-96q6-jpvc
https://github.com/zulip/zulip/releases/tag/6.2

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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.