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CVE-2021-32657— Malicious user could break user administration page

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 10.0.11之前版本, 20.0.10版本, 和 21.0.2 版本存在资源管理错误漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。

CVSS 4.3 · Medium EPSS 1.82% · P78

Possible ATT&CK Techniques 1 AI

T1484 · Domain or Tenant Policy Modification
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I. Basic Information for CVE-2021-32657

Vulnerability Information
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Vulnerability Title
Malicious user could break user administration page
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a Nextcloud package that handles data storage. In versions of Nextcloud Server prior to 10.0.11, 20.0.10, and 21.0.2, a malicious user may be able to break the user administration page. This would disallow administrators to administrate users on the Nextcloud instance. The vulnerability is fixed in versions 19.0.11, 20.0.10, and 21.0.2. As a workaround, administrators can use the OCC command line tool to administrate the Nextcloud users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 资源管理错误漏洞
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 10.0.11之前版本, 20.0.10版本, 和 21.0.2 版本存在资源管理错误漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
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 < 19.0.11 -

II. Public POCs for CVE-2021-32657

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III. Intelligence Information for CVE-2021-32657

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Vendor Advisories for CVE-2021-32657 (2)

Other References for CVE-2021-32657 (1)

Same Patch Batch · nextcloud · 2021-06-01 · 6 CVEs total

CVE-2021-32652 8.8 HIGH Missing permission check on email metadata retrieval
CVE-2021-32656 8.6 HIGH Trusted servers exchange can be triggered by attacker
CVE-2021-32654 8.1 HIGH Attacker can obtain write access to any federated share/public link
CVE-2021-32655 3.5 LOW Files Drop public link can be added as federated share
CVE-2021-32653 2.7 LOW Default settings leak federated cloud ID to lookup server of all users

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-400

V. Comments for CVE-2021-32657

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