CVE-2023-21919 : Exploit Details and Defense Strategies

This CVE record, published by Oracle on April 18, 2023, highlights a vulnerability in the MySQL Server product that can be exploited by a high privileged attacker with network access. The impact of this vulnerability includes the unauthorized ability to cause a hang or frequently repeatable crash (DOS) of MySQL Server.

Understanding CVE-2023-21919

This section delves into the details of CVE-2023-21919, providing insights into the vulnerability, its impact, affected systems, and mitigation strategies.

What is CVE-2023-21919?

CVE-2023-21919 is a vulnerability found in Oracle's MySQL Server, specifically in the Server: DDL component. It affects versions 8.0.32 and earlier. The vulnerability allows a high privileged attacker with network access via multiple protocols to compromise MySQL Server.

The Impact of CVE-2023-21919

Successful exploitation of CVE-2023-21919 can lead to the unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of the MySQL Server. The CVSS 3.1 Base Score for this vulnerability is 4.9 with a specific focus on availability impacts.

Technical Details of CVE-2023-21919

This section provides a deeper look into the technical aspects of the vulnerability, including its description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in MySQL Server allows a high privileged attacker to compromise the server via various network protocols. This can result in unauthorized actions that disrupt the server's availability.

Affected Systems and Versions

The Oracle MySQL Server versions 8.0.32 and prior are impacted by CVE-2023-21919. Users of these versions are vulnerable to exploitation by high privileged attackers with network access.

Exploitation Mechanism

The exploitation of this vulnerability involves a high privileged attacker leveraging network access through multiple protocols to compromise the MySQL Server. Successful attacks can disrupt the server's operations and cause a denial of service.

Mitigation and Prevention

In order to mitigate the risks posed by CVE-2023-21919, users and IT administrators should take immediate steps and implement long-term security practices to enhance the resilience of their systems.

Immediate Steps to Take

It is recommended to apply security patches and updates provided by Oracle to address the vulnerability. Additionally, monitoring network access and restricting privileges can help prevent unauthorized exploitation.

Long-Term Security Practices

To enhance overall system security, organizations should regularly update their software, implement access controls, conduct security training for personnel, and perform regular vulnerability assessments.

Patching and Updates

Users of Oracle MySQL Server versions 8.0.32 and earlier should apply the security updates released by Oracle to address CVE-2023-21919. Regularly checking for updates and promptly applying them is crucial in maintaining a secure environment.