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CVE-2023-28999— Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders

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存在安全漏洞，该漏洞源于允许恶意服务器获得对 E2EE 文件夹的访问权限。受影响的产品和版本：Nextcloud Desktop client 3.0.0 至 3.8.0之前版本，Nextcloud Android app 3.13.0 至 3.25.0之前版本，Nextcloud iOS app 3.0.5 至 4.8.0之前版本。

CVSS 6.9 · Medium EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2023-28999

Vulnerability Information
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Vulnerability Title
Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, 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.​ This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
缺少必要的密码学步骤
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存在安全漏洞，该漏洞源于允许恶意服务器获得对 E2EE 文件夹的访问权限。受影响的产品和版本：Nextcloud Desktop client 3.0.0 至 3.8.0之前版本，Nextcloud Android app 3.13.0 至 3.25.0之前版本，Nextcloud iOS app 3.0.5 至 4.8.0之前版本。
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 >= 3.0.0, < 3.8.0 -

II. Public POCs for CVE-2023-28999

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III. Intelligence Information for CVE-2023-28999

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Patches & Fixes for CVE-2023-28999 (1)

Vendor Advisories for CVE-2023-28999 (1)

Other References for CVE-2023-28999 (1)

Same Patch Batch · nextcloud · 2023-04-04 · 5 CVEs total

CVE-2023-28998 6.7 MEDIUM Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metada
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

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-325

V. Comments for CVE-2023-28999

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