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CVE-2021-41241— Advanced permissions is not respected for subfolders 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 存在安全漏洞，该漏洞源于Nextcloud的groupfolders应用程序允许与一群人共享一个文件夹。Nextcloud server是一个自托管系统，旨在提供云风格的服务。此外，该漏洞允许攻击者对子文件夹设置“advanced permissions”，例如，用户可以被授予对groupfolders的访问权限，但不能被授予对特定子文件夹的访问权限。由于受影响的版本缺乏权限检

CVSS 4.3 · Medium EPSS 0.85% · P57

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-41241

Vulnerability Information
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Vulnerability Title
Advanced permissions is not respected for subfolders in Nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is a self hosted system designed to provide cloud style services. The groupfolders application for Nextcloud allows sharing a folder with a group of people. In addition, it allows setting "advanced permissions" on subfolders, for example, a user could be granted access to the groupfolder but not specific subfolders. Due to a lacking permission check in affected versions, a user could still access these subfolders by copying the groupfolder to another location. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the "groupfolders" application in the admin settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
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 存在安全漏洞，该漏洞源于Nextcloud的groupfolders应用程序允许与一群人共享一个文件夹。Nextcloud server是一个自托管系统，旨在提供云风格的服务。此外，该漏洞允许攻击者对子文件夹设置“advanced permissions”，例如，用户可以被授予对groupfolders的访问权限，但不能被授予对特定子文件夹的访问权限。由于受影响的版本缺乏权限检
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-2021-41241

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III. Intelligence Information for CVE-2021-41241

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Patches & Fixes for CVE-2021-41241 (1)

Vendor Advisories for CVE-2021-41241 (2)

Other References for CVE-2021-41241 (1)

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

CVE-2021-41239 5.3 MEDIUM User enumeration setting not respected in Nextcloud server
CVE-2021-41180 4.7 MEDIUM Geolocation preview links can be set to arbitrary links in nextcloud talk
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-863

V. Comments for CVE-2021-41241

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