CVE-2023-28998— Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys
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I. Basic Information for CVE-2023-28998
Vulnerability Information
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Vulnerability Title
Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
缺少必要的密码学步骤
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 Desktop Client 3.0.0版本至3.6.5之前版本存在安全漏洞。攻击者利用该漏洞可以获得对端到端加密文件夹的完全访问权限。
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 | >= 3.0.0, < 3.6.5 | - |
II. Public POCs for CVE-2023-28998
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/nextcloud/desktop/pull/5323x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2023-28998
Same Patch Batch · nextcloud · 2023-04-04 · 5 CVEs total
| CVE-2023-28999 | 6.9 MEDIUM | Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access |
| CVE-2023-28997 | 6.7 MEDIUM | Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to br |
| CVE-2023-29000 | 5.4 MEDIUM | Nextcloud Desktop client does not verify received singed certificate in end-to-end encrypt |
| CVE-2023-28848 | 4.8 MEDIUM | CSRF protection on user_oidc login returned the expected token in case of an error |
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