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CVE-2023-32678— Zulip vulnerable to insufficient authorization check for edition/deletion of messages and topics in private streams by former subscribers

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 6.0及之前版本存在授权问题漏洞，该漏洞源于对前订阅者在私有流中编辑及删除消息和主题的授权检查不足。

CVSS 6.5 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2023-32678

Vulnerability Information
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Vulnerability Title
Zulip vulnerable to insufficient authorization check for edition/deletion of messages and topics in private streams by former subscribers
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 授权问题漏洞
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 6.0及之前版本存在授权问题漏洞，该漏洞源于对前订阅者在私有流中编辑及删除消息和主题的授权检查不足。
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 < 7.3 -

II. Public POCs for CVE-2023-32678

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III. Intelligence Information for CVE-2023-32678

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Vendor Advisories for CVE-2023-32678 (1)

Other References for CVE-2023-32678 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-32678

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