CVE-2023-48304 : Exploit Details and Defense Strategies
Discover details about CVE-2023-48304 affecting Nextcloud Server. Learn about the impact, affected versions, and mitigation strategies to secure your system.
Nextcloud Server provides data storage for Nextcloud, an open-source cloud platform. An authorization bypass vulnerability was discovered in Nextcloud Server versions prior to 25.0.11, 26.0.6, and 27.1.0. This vulnerability could allow an attacker to enable and disable the birthday calendar for any user on the same server. The affected versions have patches available to address this issue.
Understanding CVE-2023-48304
This section will cover the essential details about CVE-2023-48304, its impact, technical descriptions, affected systems, and mitigation strategies.
What is CVE-2023-48304?
In Nextcloud Server versions below 25.0.11, 26.0.6, and 27.1.0, an attacker could exploit an authorization bypass vulnerability to manipulate the birthday calendar of any user on the server.
The Impact of CVE-2023-48304
This vulnerability poses a medium severity risk with a CVSS base score of 4.3. An attacker with low privileges could potentially enable or disable the birthday calendar for any user on the same Nextcloud Server.
Technical Details of CVE-2023-48304
Let's delve into the specific technical aspects of this vulnerability.
Vulnerability Description
The issue arises from an authorization bypass through user-controlled keys, allowing an attacker to tamper with the birthday calendar feature.
Affected Systems and Versions
Nextcloud Server versions prior to 25.0.11, 26.0.6, and 27.1.0 are susceptible to this vulnerability. Additionally, versions of Nextcloud Enterprise Server prior to 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 are also affected.
Exploitation Mechanism
The vulnerability can be exploited by an attacker with low privileges on the same network, enabling them to manipulate the birthday calendar functionality of any user on the server.
Mitigation and Prevention
Discover the steps to mitigate the risks associated with CVE-2023-48304.
Immediate Steps to Take
Users are advised to update their Nextcloud Server to versions 25.0.11, 26.0.6, or 27.1.0 to eliminate the vulnerability. Installing the available patches is crucial to secure the system.
Long-Term Security Practices
Regularly monitor Nextcloud security advisories and apply updates promptly to safeguard against potential vulnerabilities.
Patching and Updates
Ensure timely installation of security patches released by Nextcloud to address known vulnerabilities and enhance system security.