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CVE-2021-32800— Bypass of Two Factor Authentication 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存在访问控制错误漏洞，该漏洞源于攻击者可利用该漏洞能够绕过Nextcloud中的双因素身份验证。

CVSS 8.1 · High EPSS 1.80% · P78

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2021-32800

Vulnerability Information
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Vulnerability Title
Bypass of Two Factor Authentication in Nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source, self hosted personal cloud. In affected versions an attacker is able to bypass Two Factor Authentication in Nextcloud. Thus knowledge of a password, or access to a WebAuthN trusted device of a user was sufficient to gain access to an account. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. There are no workaround for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 访问控制错误漏洞
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存在访问控制错误漏洞，该漏洞源于攻击者可利用该漏洞能够绕过Nextcloud中的双因素身份验证。
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 < 20.0.12 -

II. Public POCs for CVE-2021-32800

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III. Intelligence Information for CVE-2021-32800

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Patches & Fixes for CVE-2021-32800 (1)

Vendor Advisories for CVE-2021-32800 (2)

Same Patch Batch · nextcloud · 2021-09-07 · 9 CVEs total

CVE-2021-32802 9.3 CRITICAL Preview generation used third-party library not suited for user-generated content in Nextc
CVE-2021-37628 7.5 HIGH File Drop can be bypassed using Richdocuments app in nextcloud
CVE-2021-37630 6.5 MEDIUM Secret Circle can be joined without approval in Nextcloud Circles
CVE-2021-37631 6.5 MEDIUM Circle can be accessed by non-Circle members in Nextcloud Deck
CVE-2021-32782 5.8 MEDIUM Cross-Site Scripting in Nextcloud Circles
CVE-2021-32801 5.5 MEDIUM Exceptions may have logged Encryption-at-Rest key content in Nextcloud server
CVE-2021-32766 5.3 MEDIUM Nextcloud Text app can disclose existence of folders in "File Drop" link share
CVE-2021-37629 5.3 MEDIUM Lack of ratelimit on Richdocuments OCS endpoint in nextcloud

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-306

V. Comments for CVE-2021-32800

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