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CVE-2023-28997— Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files

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 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恢复和修改端到端加密文件的内容。

CVSS 6.7 · Medium EPSS 1.11% · P65
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I. Basic Information for CVE-2023-28997

Vulnerability Information
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Vulnerability Title
Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files
Source: CVE Program / CVE List V5
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 recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. 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:N
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
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 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恢复和修改端到端加密文件的内容。
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-2023-28997

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III. Intelligence Information for CVE-2023-28997

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Patches & Fixes for CVE-2023-28997 (1)

Vendor Advisories for CVE-2023-28997 (1)

Other References for CVE-2023-28997 (1)

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-2023-28998 6.7 MEDIUM Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metada
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-323

V. Comments for CVE-2023-28997

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