CVE-2021-32653— Default settings leak federated cloud ID to lookup server of all users
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过发送数据的信息暴露
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://hackerone.com/reports/1173436x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-32653
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 |
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V. Comments for CVE-2021-32653
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