CVE-2023-48304— Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
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 Server 25.0.11之前、26.0.6之前 和 27.1.0 之前版本以及 Nextcloud Enterprise Server 22.2.10.16之前、23.0.12.11之前、24.0.12.7之前、25.0.11之前、26.0.6 之前和 27.1.0之前版本存在安全漏洞，攻击者利用该漏洞可以启用和禁用同一服务器上任何用户的生日日历。
Possible ATT&CK Techniques 1 AI
T1098 · Account Manipulation
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I. Basic Information for CVE-2023-48304
Vulnerability Information
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Vulnerability Title
Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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 Server 25.0.11之前、26.0.6之前 和 27.1.0 之前版本以及 Nextcloud Enterprise Server 22.2.10.16之前、23.0.12.11之前、24.0.12.7之前、25.0.11之前、26.0.6 之前和 27.1.0之前版本存在安全漏洞，攻击者利用该漏洞可以启用和禁用同一服务器上任何用户的生日日历。
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 | >= 25.0.0, < 25.0.11 | - |
|
II. Public POCs for CVE-2023-48304
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-48304 (1)
-
https://github.com/nextcloud/server/pull/40292 x_refsource_MISC
Vendor Advisories for CVE-2023-48304 (1)
Other References for CVE-2023-48304 (1)
-
https://hackerone.com/reports/2112973 x_refsource_MISC
Same Patch Batch · nextcloud · 2023-11-21 · 8 CVEs total
| CVE-2023-48239 | 8.5 HIGH | Nextcloud Server users can make external storage mount points inaccessible for other users |
| CVE-2023-48306 | 5.0 MEDIUM | Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF |
| CVE-2023-48305 | 4.2 MEDIUM | Nextcloud Server user_ldap app logs user passwords in the log file on level debug |
| CVE-2023-48307 | 3.5 LOW | Nextcloud Mail app vulnerable to Server-Side Request Forgery |
| CVE-2023-48302 | 3.5 LOW | Nextcloud Server vulnerable to Self XSS when pasting HTML into Text app with Ctrl+Shift+V |
| CVE-2023-48301 | 3.5 LOW | Nextcloud Server HTML injection in search UI when selecting a circle with HTML in the disp |
| CVE-2023-48303 | 2.4 LOW | Nextcloud Server admins can change authentication details of user configured external stor |
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