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CVE-2023-29000— Nextcloud Desktop client does not verify received singed certificate in end-to-end encryption

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3.7.0之前版本存在信任管理问题漏洞。攻击者利用该漏洞获取用户密钥加密文件。

CVSS 5.4 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2023-29000

Vulnerability Information
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Vulnerability Title
Nextcloud Desktop client does not verify received singed certificate in end-to-end encryption
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 3.7.0, by trusting that the server will return a certificate that belongs to the keypair of the user, a malicious server could get the desktop client to encrypt files with a key known to the attacker. This issue is fixed in Nextcloud Desktop 3.7.0. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 信任管理问题漏洞
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3.7.0之前版本存在信任管理问题漏洞。攻击者利用该漏洞获取用户密钥加密文件。
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, < 3.7.0 -

II. Public POCs for CVE-2023-29000

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III. Intelligence Information for CVE-2023-29000

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Patches & Fixes for CVE-2023-29000 (1)

Vendor Advisories for CVE-2023-29000 (1)

Other References for CVE-2023-29000 (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-2023-28997 6.7 MEDIUM Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to br
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-295

V. Comments for CVE-2023-29000

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