CVE-2023-28847 : Vulnerability Insights and Analysis

This CVE involves a vulnerability in Nextcloud Server that lacks brute force protection for passwords of password-protected share links. Attackers could exploit this issue to perform brute force attacks on passwords, potentially compromising security.

Understanding CVE-2023-28847

This vulnerability affects Nextcloud Server versions prior to 24.0.11 and 25.0.5, as well as Nextcloud Server Enterprise versions prior to 23.0.12.6, 24.0.11, and 25.0.5. The vulnerability allows attackers to verify passwords of share links without any restrictions, enabling brute force attacks.

What is CVE-2023-28847?

CVE-2023-28847 is a security vulnerability in Nextcloud Server that exposes a weakness in password protection for share links. The lack of brute force protection makes it easier for attackers to guess passwords through successive login attempts.

The Impact of CVE-2023-28847

The impact of this vulnerability is significant as it allows unauthorized individuals to potentially gain access to sensitive information stored on Nextcloud Server. By exploiting this issue, attackers can bypass password protection mechanisms and compromise data integrity.

Technical Details of CVE-2023-28847

This section provides more insight into the vulnerability, including its description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in Nextcloud Server allows attackers to perform brute force attacks on passwords associated with share links. This weakness exposes the system to unauthorized access and potential data breaches.

Affected Systems and Versions

Nextcloud Server versions prior to 24.0.11 and 25.0.5, as well as Nextcloud Server Enterprise versions prior to 23.0.12.6, 24.0.11, and 25.0.5 are susceptible to this vulnerability. Users of these versions are at risk and should take immediate action to mitigate the threat.

Exploitation Mechanism

Attackers exploit this vulnerability by attempting multiple login combinations to guess passwords of share links on Nextcloud Server. Without proper brute force protection, they can gain unauthorized access to sensitive information.

Mitigation and Prevention

To secure systems against CVE-2023-28847 and similar vulnerabilities, organizations and users should follow best practices for immediate response and long-term security measures.

Immediate Steps to Take

Users should update Nextcloud Server to version 24.0.11 or 25.0.5, and Nextcloud Enterprise Server to version 23.0.12.6, 24.0.11, or 25.0.5 to patch the vulnerability.
Implement strong password policies and multi-factor authentication to enhance security.

Long-Term Security Practices

Regularly monitor and update software to address security vulnerabilities promptly.
Conduct security audits and assessments to identify and mitigate potential risks.
Educate users on cybersecurity best practices to prevent exploitation of vulnerabilities.

Patching and Updates

Following the release of patches by Nextcloud, users should promptly apply the updates to ensure their systems are protected against CVE-2023-28847 and other security threats. Regularly checking for software updates and security advisories is essential to maintain a secure environment.