CVE-2021-32800— Bypass of Two Factor Authentication in Nextcloud server
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
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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|---|
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- https://github.com/nextcloud/server/pull/28078x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-32800
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 |
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V. Comments for CVE-2021-32800
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