CVE-2021-32727— Nextcloud 信任管理问题漏洞
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I. CVE-2021-32727の基本情報
脆弱性情報
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脆弱性タイトル
End-to-end encryption device setup did not verify public key
ソース: NVD (National Vulnerability Database)
脆弱性説明
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.
ソース: NVD (National Vulnerability Database)
CVSS情報
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
ソース: NVD (National Vulnerability Database)
脆弱性タイプ
证书验证不恰当
ソース: NVD (National Vulnerability Database)
脆弱性タイトル
Nextcloud 信任管理问题漏洞
ソース: CNNVD (China National Vulnerability Database)
脆弱性説明
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 Android Client在3.16.1之前版本存在信任管理问题漏洞，该漏洞源于Nextcloud Android客户端跳过了一个涉及客户端检查私钥是否属于之前下载的公共证书的步骤。如果Nextcloud实例提供了一个恶意公钥，那么数据将为此密钥进行加密，从而可以被恶意参与者访问。
ソース: CNNVD (China National Vulnerability Database)
CVSS情報
N/A
ソース: CNNVD (China National Vulnerability Database)
脆弱性タイプ
N/A
ソース: CNNVD (China National Vulnerability Database)
影響を受ける製品
| ベンダー | プロダクト | 影響を受けるバージョン | CPE | 購読 |
|---|---|---|---|---|
| nextcloud | security-advisories | < 3.16.1 | - |
II. CVE-2021-32727の公開POC
| # | POC説明 | ソースリンク | Shenlongリンク |
|---|
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公開POCは見つかりませんでした。
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- https://hackerone.com/reports/1189162x_refsource_MISC
- https://github.com/nextcloud/android/pull/8438x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-32727
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-2021-32726 | 7.1 HIGH | Webauthn tokens not removed after user has been deleted |
| 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. 関連脆弱性
同じ製品: security-advisories
- CVE-2026-28272
Kiteworks Email Protection Gateway has a Cross-site Scriptin - CVE-2026-28271
Kiteworks Core is vulnerable to Server-Side Request Forgery - CVE-2026-28270
Kiteworks Core has an Unrestricted Upload of File with Dange - CVE-2026-28269
Kiteworks Core has an OS Command Injection - CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public
同じベンダー: nextcloud
- CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public - CVE-2025-66556
Nextcloud talk allows participants to blindly delete poll dr - CVE-2025-66554
Nextcloud Contacts vulnerable to Stored XSS in contacts app - CVE-2025-66549
Nextcloud Desktop discloses information when attempting to l - CVE-2025-66545
Nextcloud Groupfolders users with read-only permissions for
同じ弱点: CWE-295
V. CVE-2021-32727へのコメント
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