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CVE-2022-31017— Expression Always True vulnerability in Zulip Server

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Zulip团队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 2.1.0版本至5.2版本存在安全漏洞，该漏洞源于服务器错误地向所有当前订阅者发送包含已编辑消息的API事件。

CVSS 2.0 · Low EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2022-31017

Vulnerability Information
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Vulnerability Title
Expression Always True vulnerability in Zulip Server
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool. Versions 2.1.0 through and including 5.2 are vulnerable to a logic error. A stream configured as private with protected history, where new subscribers should not be allowed to see messages sent before they were subscribed, when edited causes the server to incorrectly send an API event that includes the edited message to all of the stream’s current subscribers. This API event is ignored by official clients, but can be observed by using a modified client or the browser’s developer tools. This bug will be fixed in Zulip Server 5.3. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
表达式永真
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是Zulip团队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 2.1.0版本至5.2版本存在安全漏洞，该漏洞源于服务器错误地向所有当前订阅者发送包含已编辑消息的API事件。
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, < 5.3 -

II. Public POCs for CVE-2022-31017

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III. Intelligence Information for CVE-2022-31017

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Vendor Advisories for CVE-2022-31017 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip

V. Comments for CVE-2022-31017

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