CVE-2023-48306— Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
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之前版本存在代码问题漏洞，该漏洞源于DNS pin 中间件容易受到 DNS 重新绑定的影响，攻击者利用该漏洞可以执行服务端请
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1557.002 · ARP Cache Poisoning
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I. Basic Information for CVE-2023-48306
Vulnerability Information
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Vulnerability Title
Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
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, the DNS pin middleware was vulnerable to DNS rebinding allowing an attacker to perform SSRF as a final result. 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:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 代码问题漏洞
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 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之前版本存在代码问题漏洞，该漏洞源于DNS pin 中间件容易受到 DNS 重新绑定的影响，攻击者利用该漏洞可以执行服务端请
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 | >= 22.0.0, < 22.2.10.16 | - |
|
II. Public POCs for CVE-2023-48306
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-48306 (1)
-
https://github.com/nextcloud/server/pull/40234 x_refsource_MISC
Vendor Advisories for CVE-2023-48306 (1)
Other References for CVE-2023-48306 (1)
-
https://hackerone.com/reports/2115212 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-2023-48304 | 4.3 MEDIUM | Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user |
| 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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