CVE-2023-48303 : Security Advisory and Response
Learn about CVE-2023-48303 affecting Nextcloud Server versions 25.0.0 to 27.1.0. Get insights on impact, technical details, and mitigation steps for this security vulnerability.
Nextcloud Server admins can change authentication details of user-configured external storage.
Understanding CVE-2023-48303
This CVE describes a vulnerability in Nextcloud Server that allows admins to change authentication details of user-configured external storage, impacting versions 25.0.0 to 27.1.0.
What is CVE-2023-48303?
Nextcloud Server versions prior to 25.0.11, 26.0.6, and 27.1.0 allow administrators to modify authentication details of user-configured external storage, posing a security risk.
The Impact of CVE-2023-48303
The vulnerability could lead to unauthorized access to sensitive data stored on Nextcloud Server, compromising the integrity and confidentiality of user information.
Technical Details of CVE-2023-48303
The following technical details outline the vulnerability in Nextcloud Server:
Vulnerability Description
Admins can change authentication details of user-configured external storage in Nextcloud Server versions 25.0.0 to 27.1.0, potentially leading to unauthorized access.
Affected Systems and Versions
- Versions affected: >= 25.0.0, < 25.0.11 / >= 26.0.0, < 26.0.6 / >= 27.0.0, < 27.1.0
- Status: Affected
Exploitation Mechanism
An attacker with high privileges can exploit this vulnerability by changing authentication details of user-configured external storage, gaining unauthorized access.
Mitigation and Prevention
To address CVE-2023-48303 in Nextcloud Server, consider the following mitigation strategies:
Immediate Steps to Take
- Upgrade to Nextcloud Server versions 25.0.11, 26.0.6, or 27.1.0 that contain a patch for this vulnerability.
- Restrict admin privileges and user access to reduce the risk of unauthorized modifications.
Long-Term Security Practices
- Regularly monitor Nextcloud Server for any unauthorized changes to external storage configurations.
- Educate admins on best practices for maintaining secure authentication settings.
Patching and Updates
- Apply security patches released by Nextcloud promptly to address known vulnerabilities and enhance system security.