CVE-2023-21935 : What You Need to Know

This CVE-2023-21935 was assigned by Oracle on December 17, 2022, and was published on April 18, 2023. It pertains to a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting versions 8.0.32 and earlier. The vulnerability allows a high-privileged attacker with network access via multiple protocols to compromise MySQL Server, potentially leading to a complete denial of service (DOS) attack.

Understanding CVE-2023-21935

This section will delve into what CVE-2023-21935 is and its potential impact on affected systems.

What is CVE-2023-21935?

CVE-2023-21935 is a vulnerability in Oracle's MySQL Server, particularly within the Server Optimizer component. It is categorized as an easily exploitable vulnerability that permits a high-privileged attacker with network access to compromise the MySQL Server.

The Impact of CVE-2023-21935

Successful exploitation of CVE-2023-21935 can grant unauthorized access to cause a system hang or frequent crashes of the MySQL Server, resulting in a complete denial of service condition. The CVSS 3.1 Base Score for this vulnerability is 4.9, with availability being the primary impact.

Technical Details of CVE-2023-21935

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in MySQL Server allows a high-privileged attacker to compromise the server, potentially leading to a complete denial of service through system hangs or crashes.

Affected Systems and Versions

The Oracle MySQL Server versions 8.0.32 and prior are impacted by CVE-2023-21935.

Exploitation Mechanism

An attacker with high privileges and network access via various protocols can exploit this vulnerability to compromise the MySQL Server.

Mitigation and Prevention

To address CVE-2023-21935, prompt actions need to be taken to secure affected systems and prevent possible exploits.

Immediate Steps to Take

Oracle MySQL Server users should update their systems to versions beyond 8.0.32, where the vulnerability has been patched.
Implement network security measures to restrict access to the MySQL Server to authorized users only.

Long-Term Security Practices

Regularly monitor for security updates and patches released by Oracle for the MySQL Server.
Conduct routine security audits and assessments to identify and mitigate potential vulnerabilities proactively.

Patching and Updates

It is crucial for organizations using Oracle MySQL Server to stay informed about security advisories and apply patches promptly to ensure the ongoing security of their systems.