CVE-2023-21870 : What You Need to Know

This CVE record was published by Oracle on January 17, 2023, highlighting a vulnerability in the MySQL Server product. The vulnerability, identified as CVE-2023-21870, affects versions 8.0.31 and prior, allowing a high privileged attacker with network access to compromise the MySQL Server.

Understanding CVE-2023-21870

This section provides an overview of what CVE-2023-21870 entails, its impact, technical details, and mitigation strategies.

What is CVE-2023-21870?

CVE-2023-21870 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically in the Server Optimizer component. It allows a high privileged attacker to compromise the MySQL Server through multiple protocols, potentially leading to unauthorized actions that can cause a hang or crash of the MySQL Server.

The Impact of CVE-2023-21870

The successful exploitation of this vulnerability can result in a complete Denial of Service (DOS) of the MySQL Server. Attackers with network access and high privileges can exploit this vulnerability, affecting the availability of the server. The CVSS 3.1 Base Score for this vulnerability is 4.9, with a focus on availability impacts.

Technical Details of CVE-2023-21870

Delving into the specifics of CVE-2023-21870, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the MySQL Server product enables attackers to compromise the server if they possess high privileges and network access. This can lead to a complete DOS scenario where the server becomes unresponsive or crashes repeatedly.

Affected Systems and Versions

The impacted system is the Oracle MySQL Server, specifically versions 8.0.31 and any prior versions. Users utilizing these versions are at risk of exploitation by high privileged attackers with network access.

Exploitation Mechanism

Attackers can exploit this vulnerability through various protocols, leveraging their high privileges and network access to compromise the MySQL Server. By triggering unauthorized actions, they can disrupt the normal functioning of the server.

Mitigation and Prevention

Outlined below are the steps to mitigate the risks posed by CVE-2023-21870 and prevent potential exploitation in the future.

Immediate Steps to Take

Update MySQL Server: Ensure that you update the MySQL Server to a patched version that addresses the vulnerability.
Network Security: Implement strict network security measures to prevent unauthorized access to the server by malicious actors.

Long-Term Security Practices

Regular Security Audits: Conduct periodic security audits to identify and address any vulnerabilities in the system.
Employee Training: Provide security awareness training to employees to enhance their understanding of potential threats and preventive measures.

Patching and Updates

Stay informed about security advisories released by Oracle and promptly apply patches and updates to the MySQL Server. Regularly monitor for security updates to ensure your system is protected from known vulnerabilities.