CVE-2023-25816 Explained : Impact and Mitigation

This CVE-2023-25816 pertains to a vulnerability in Nextcloud that allows for Uncontrolled Resource Consumption. It was published on February 24, 2023.

Understanding CVE-2023-25816

This section delves into the nature of the CVE-2023-25816 vulnerability in Nextcloud.

What is CVE-2023-25816?

The CVE-2023-25816 vulnerability in Nextcloud involves Uncontrolled Resource Consumption. Specifically, versions 25.0.0 and above, before version 25.0.3, are impacted by this issue. It allows a user to set an excessively long password, leading to higher resource consumption during password validation than intended. The problem has been addressed in version 25.0.3 with a patch provided.

The Impact of CVE-2023-25816

With this vulnerability, threat actors can potentially cause excessive resource consumption on affected systems by inputting unusually long passwords, which could impact system performance.

Technical Details of CVE-2023-25816

This section outlines the technical aspects of the CVE-2023-25816 vulnerability.

Vulnerability Description

The vulnerability enables users to configure passwords of abnormally long lengths, resulting in greater resource utilization during password validation, thereby affecting system performance.

Affected Systems and Versions

The affected system is Nextcloud, specifically versions starting from 25.0.0 up to version 25.0.3, before the patch was applied.

Exploitation Mechanism

By setting excessively long passwords, users can trigger the vulnerability, causing heightened resource consumption during the password validation process.

Mitigation and Prevention

Understanding how to mitigate and prevent the CVE-2023-25816 vulnerability is crucial for ensuring system security.

Immediate Steps to Take

Users should promptly update their Nextcloud installations to version 25.0.3 or above to mitigate the Uncontrolled Resource Consumption issue stemming from overly long passwords.

Long-Term Security Practices

Implementing robust password policies and regularly updating software are long-term practices that can help prevent similar vulnerabilities in the future.

Patching and Updates

Nextcloud users should prioritize applying security patches and staying informed about the latest updates to safeguard their systems against known vulnerabilities like CVE-2023-25816.