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CVE-2021-41239— User enumeration setting not respected in Nextcloud server

Quick assessment

Affected
nextcloud security-advisories
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.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud server 存在信息泄露漏洞，该漏洞源于用户状态API没有考虑管理员的用户枚举设置。Nextcloud server是一个自托管系统，旨在提供云风格的服务。这允许用户枚举实例上的其他用户，即使用户清单被禁用。Nextcloud server建议升级到20.0.14、21.0.6或22.2.1。没有已知的解决方法。

CVSS 5.3 · Medium EPSS 1.13% · P65
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I. Basic Information for CVE-2021-41239

Vulnerability Information
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Vulnerability Title
User enumeration setting not respected in Nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud server 存在信息泄露漏洞，该漏洞源于用户状态API没有考虑管理员的用户枚举设置。Nextcloud server是一个自托管系统，旨在提供云风格的服务。这允许用户枚举实例上的其他用户，即使用户清单被禁用。Nextcloud server建议升级到20.0.14、21.0.6或22.2.1。没有已知的解决方法。
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
nextcloud security-advisories < 20.0.14 -

II. Public POCs for CVE-2021-41239

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III. Intelligence Information for CVE-2021-41239

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Patches & Fixes for CVE-2021-41239 (1)

Vendor Advisories for CVE-2021-41239 (2)

Other References for CVE-2021-41239 (1)

Same Patch Batch · nextcloud · 2022-03-08 · 4 CVEs total

CVE-2021-41180 4.7 MEDIUM Geolocation preview links can be set to arbitrary links in nextcloud talk
CVE-2021-41241 4.3 MEDIUM Advanced permissions is not respected for subfolders in Nextcloud server
CVE-2021-41181 2.4 LOW Nextcloud Talk app exposes chat messages on lockscreen

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-200

V. Comments for CVE-2021-41239

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