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CVE-2023-28623— Unauthorized user can register an account in specific configurations in Zulip

Quick assessment

Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 6.2之前版本存在安全漏洞，该漏洞源于如果组织权限不需要邀请即可加入，攻击者可以在组织中创建一个新帐户，并使用他们控制的任意电子邮件地址。

CVSS 6.5 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1136 · Create Account
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I. Basic Information for CVE-2023-28623

Vulnerability Information
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Vulnerability Title
Unauthorized user can register an account in specific configurations in Zulip
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool with unique topic-based threading. In the event that 1: `ZulipLDAPAuthBackend` and an external authentication backend (any aside of `ZulipLDAPAuthBackend` and `EmailAuthBackend`) are the only ones enabled in `AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py` and 2: The organization permissions don't require invitations to join. An attacker can create a new account in the organization with an arbitrary email address in their control that's not in the organization's LDAP directory. The impact is limited to installations which have this specific combination of authentication backends as described above in addition to having `Invitations are required for joining this organization` organization permission disabled. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may enable the `Invitations are required for joining this organization` organization permission to prevent this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip 6.2之前版本存在安全漏洞，该漏洞源于如果组织权限不需要邀请即可加入，攻击者可以在组织中创建一个新帐户，并使用他们控制的任意电子邮件地址。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zulip zulip >= 2.1.0, < 6.2 -

II. Public POCs for CVE-2023-28623

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III. Intelligence Information for CVE-2023-28623

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Patches & Fixes for CVE-2023-28623 (1)

Vendor Advisories for CVE-2023-28623 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-285

V. Comments for CVE-2023-28623

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