CVE-2023-48306: Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
First published: Tue Nov 21 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nextcloud Nextcloud Server | >=22.0.0<22.2.10.16 | |
| Nextcloud Nextcloud Server | >=23.0.0<23.0.12.11 | |
| Nextcloud Nextcloud Server | >=24.0.0<24.0.12.7 | |
| Nextcloud Nextcloud Server | >=25.0.0<25.0.11 | |
| Nextcloud Nextcloud Server | >=25.0.0<25.0.11 | |
| Nextcloud Nextcloud Server | >=26.0.0<26.0.6 | |
| Nextcloud Nextcloud Server | >=26.0.0<26.0.6 | |
| Nextcloud Nextcloud Server | >=27.0.0<27.1.0 | |
| Nextcloud Nextcloud Server | >=27.0.0<27.1.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2023-48306?
CVE-2023-48306 is a vulnerability in Nextcloud Server that allows for DNS rebinding and SSRF attacks.
How severe is CVE-2023-48306?
CVE-2023-48306 has a severity rating of 9.8 (Critical).
Which versions of Nextcloud Server are affected by CVE-2023-48306?
Versions prior to 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and prior to 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server Enterprise are affected by CVE-2023-48306.
How can CVE-2023-48306 be exploited?
CVE-2023-48306 can be exploited by tricking the Nextcloud Server DNS pin middleware into DNS rebinding, allowing for SSRF attacks.
Is there a fix for CVE-2023-48306?
Yes, the fix for CVE-2023-48306 is included in versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server.
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- vendor/nextcloud
- canonical/nextcloud nextcloud server
- version/nextcloud nextcloud server/22.0.0
- version/nextcloud nextcloud server/23.0.0
- version/nextcloud nextcloud server/24.0.0
- version/nextcloud nextcloud server/25.0.0
- version/nextcloud nextcloud server/26.0.0
- version/nextcloud nextcloud server/27.0.0