CVE-2023-48306 Explained : Impact and Mitigation
Discover the impact of CVE-2023-48306 on Nextcloud Server due to a DNS pin middleware vulnerability leading to SSRF. Learn about affected versions and mitigation strategies.
Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF.
Understanding CVE-2023-48306
Nextcloud Server was found to have a vulnerability in its DNS pin middleware that could be exploited for Server-Side Request Forgery (SSRF).
What is CVE-2023-48306?
Nextcloud Server, an open source cloud platform, versions 22.0.0 to 27.1.0 were vulnerable to DNS rebinding, enabling an attacker to conduct SSRF attacks.
The Impact of CVE-2023-48306
The vulnerability in the DNS pin middleware of Nextcloud Server allowed attackers to trick it into performing SSRF attacks, potentially leading to unauthorized access and data breaches.
Technical Details of CVE-2023-48306
The vulnerability enables attackers to exploit the DNS pin middleware of Nextcloud Server for SSRF attacks, compromising the integrity and confidentiality of the system.
Vulnerability Description
The DNS rebinding vulnerability in Nextcloud Server versions allowed attackers to manipulate the DNS resolution to perform SSRF attacks, posing a significant security risk.
Affected Systems and Versions
Nextcloud Server versions from 22.0.0 to 27.1.0 and Enterprise Server versions from 22.2.10.16 to 27.1.0 were affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit the DNS pin middleware to trick Nextcloud Server into performing SSRF attacks, gaining unauthorized access to sensitive information.
Mitigation and Prevention
To address CVE-2023-48306 and prevent exploitation, users need to take immediate steps and implement long-term security measures.
Immediate Steps to Take
Update Nextcloud Server to the patched versions, including 25.0.11, 26.0.6, and 27.1.0, along with Nextcloud Enterprise Server versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0.
Long-Term Security Practices
Regularly monitor for security advisories, apply software updates promptly, and follow secure coding practices to prevent similar vulnerabilities in the future.
Patching and Updates
Ensure to install the security patches provided by Nextcloud to mitigate the DNS rebinding vulnerability and protect your systems from potential SSRF attacks.