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CVE-2023-35173— End-to-End encrypted file-drops can be made inaccessible

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 End-to-end encryption app 1.12.0及之前版本存在安全漏洞，该漏洞源于允许攻击者通过提供无效的元数据文件使以前丢弃的文件无法访问。

CVSS 5.7 · Medium EPSS 0.49% · P40
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I. Basic Information for CVE-2023-35173

Vulnerability Information
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Vulnerability Title
End-to-End encrypted file-drops can be made inaccessible
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud End-to-end encryption app provides all the necessary APIs to implement End-to-End encryption on the client side. By providing an invalid meta data file, an attacker can make previously dropped files inaccessible. It is recommended that the Nextcloud End-to-end encryption app is upgraded to version 1.12.4 that contains the fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
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 End-to-end encryption app 1.12.0及之前版本存在安全漏洞，该漏洞源于允许攻击者通过提供无效的元数据文件使以前丢弃的文件无法访问。
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 >= 1.12.0, < 1.12.4 -

II. Public POCs for CVE-2023-35173

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III. Intelligence Information for CVE-2023-35173

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Patches & Fixes for CVE-2023-35173 (1)

Vendor Advisories for CVE-2023-35173 (1)

Other References for CVE-2023-35173 (1)

Same Patch Batch · nextcloud · 2023-06-23 · 5 CVEs total

CVE-2023-35172 8.7 HIGH Nextcloud Server password reset endpoint is not brute force protected
CVE-2023-35928 8.5 HIGH Nextcloud user scoped external storage can be used to gather credentials of other users
CVE-2023-35927 7.6 HIGH Nextcloud system addressbooks can be modified by malicious trusted server
CVE-2023-35171 4.1 MEDIUM Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2023-35173

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