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CVE-2021-41177— Rate-limits not working on instances without configured memory cache backend

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存在安全漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。

CVSS 8.1 · High EPSS 1.55% · P74

Possible ATT&CK Techniques 1 AI

T1110.003 · Password Spraying
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I. Basic Information for CVE-2021-41177

Vulnerability Information
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Vulnerability Title
Rate-limits not working on instances without configured memory cache backend
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
交互频率的控制不恰当
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存在安全漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
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 < 20.0.13 -

II. Public POCs for CVE-2021-41177

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III. Intelligence Information for CVE-2021-41177

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Patches & Fixes for CVE-2021-41177 (1)

Vendor Advisories for CVE-2021-41177 (2)

Other References for CVE-2021-41177 (1)

Same Patch Batch · nextcloud · 2021-10-25 · 8 CVEs total

CVE-2021-41178 8.8 HIGH File Traversal affecting SVG files on Nextcloud Server
CVE-2021-39225 8.1 HIGH Missing permission check on Deck API
CVE-2021-41179 6.5 MEDIUM Two-Factor Authentication not enforced for pages marked as public
CVE-2021-39221 6.4 MEDIUM XSS in Contacts
CVE-2021-39223 4.8 MEDIUM File path disclosure of shared files in Richdocuments application
CVE-2021-39220 3.5 LOW Bypass of image blocking in Nextcloud Mail
CVE-2021-39224 3.5 LOW File path disclosure of shared files in OfficeOnline application

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-799

V. Comments for CVE-2021-41177

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