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CVE-2021-32726— Webauthn tokens not removed after user has been deleted

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在19.0.13、20.011和21.0.3之前的版本存在安全漏洞，该漏洞源于删除用户后不会删除webauthn令牌。如果受害者重复使用以前使用过的用户名，以前的用户就可以访问他们的帐户。

CVSS 7.1 · High EPSS 1.78% · P78
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I. Basic Information for CVE-2021-32726

Vulnerability Information
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Vulnerability Title
Webauthn tokens not removed after user has been deleted
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的属主授予
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在19.0.13、20.011和21.0.3之前的版本存在安全漏洞，该漏洞源于删除用户后不会删除webauthn令牌。如果受害者重复使用以前使用过的用户名，以前的用户就可以访问他们的帐户。
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 < 19.0.13 -

II. Public POCs for CVE-2021-32726

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III. Intelligence Information for CVE-2021-32726

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Patches & Fixes for CVE-2021-32726 (1)

Vendor Advisories for CVE-2021-32726 (2)

Other References for CVE-2021-32726 (1)

Same Patch Batch · nextcloud · 2021-07-12 · 14 CVEs total

CVE-2021-32688 8.8 HIGH Application specific tokens can change their own scope
CVE-2021-32689 8.1 HIGH Nextcloud Talk not properly disassociating users from chats after account deletion
CVE-2021-32727 5.7 MEDIUM End-to-end encryption device setup did not verify public key
CVE-2021-32741 5.3 MEDIUM Lack of ratelimit on public share link mount endpoint
CVE-2021-32705 5.3 MEDIUM Lack of ratelimit on public DAV endpoint
CVE-2021-32703 5.3 MEDIUM Lack of ratelimit on shareinfo endpoint
CVE-2021-32733 4.8 MEDIUM XSS in Nextcloud Text application
CVE-2021-32707 4.3 MEDIUM Bypass of image blocking in Nextcloud Mail
CVE-2021-32678 3.7 LOW Ratelimit not applied on OCS API responses
CVE-2021-32725 3.5 LOW Default share permissions not respected for federated reshares
CVE-2021-32679 3.5 LOW Filenames not escaped by default in controllers using DownloadResponse
CVE-2021-32680 3.3 LOW Audit log is not properly logging unsetting of share expiration date
CVE-2021-32734 3.1 LOW File path disclosure of shared files in Nextcloud Text application

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-708

V. Comments for CVE-2021-32726

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