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CVE-2021-32653— Default settings leak federated cloud ID to lookup server of all users

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 存在安全漏洞，在用户没有设置为已发布的字段时，Nextcloud Server也会将用户ID发送到查找服务器。以下产品和版本受到影响：Nextcloud Server 19.0.11、20.0.10或21.0.2之前的版本。

CVSS 2.7 · Low EPSS 1.21% · P67
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I. Basic Information for CVE-2021-32653

Vulnerability Information
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Vulnerability Title
Default settings leak federated cloud ID to lookup server of all users
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
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 存在安全漏洞，在用户没有设置为已发布的字段时，Nextcloud Server也会将用户ID发送到查找服务器。以下产品和版本受到影响：Nextcloud Server 19.0.11、20.0.10或21.0.2之前的版本。
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-2021-32653

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III. Intelligence Information for CVE-2021-32653

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Vendor Advisories for CVE-2021-32653 (2)

Other References for CVE-2021-32653 (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-2021-32657 4.3 MEDIUM Malicious user could break user administration page
CVE-2021-32655 3.5 LOW Files Drop public link can be added as federated share

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-201

V. Comments for CVE-2021-32653

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