CVE-2021-36774 : Exploit Details and Defense Strategies

Apache Kylin allows users to read data from other database systems using JDBC. The MySQL JDBC driver supports certain properties, which, if left unmitigated, can allow an attacker to execute arbitrary code from a hacker-controlled malicious MySQL server within Kylin server processes. This vulnerability affects Apache Kylin 2 version 2.6.6 and prior versions, as well as Apache Kylin 3 version 3.1.2 and prior versions.

Understanding CVE-2021-36774

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-36774.

What is CVE-2021-36774?

CVE-2021-36774, also known as 'Mysql JDBC Connector Deserialize RCE,' is a vulnerability in Apache Kylin that allows remote attackers to execute arbitrary code through the MySQL JDBC driver.

The Impact of CVE-2021-36774

The impact of this vulnerability is considered moderate. Attackers can exploit it to execute arbitrary code within Kylin server processes, posing a serious security risk to affected systems.

Technical Details of CVE-2021-36774

Let's delve into the specifics of the vulnerability, including its description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the MySQL JDBC driver allows attackers to exploit certain properties, enabling them to execute arbitrary code from a malicious MySQL server within Kylin processes.

Affected Systems and Versions

Apache Kylin 2 version 2.6.6 and previous versions, and Apache Kylin 3 version 3.1.2 and prior versions are affected by this vulnerability.

Exploitation Mechanism

By leveraging the MySQL JDBC driver properties, attackers can execute arbitrary code within the context of Kylin server processes.

Mitigation and Prevention

This section outlines the immediate steps to take and best practices for long-term security.

Immediate Steps to Take

Users of Apache Kylin 2.x and Kylin 3.x are advised to upgrade to version 3.1.3 or apply the patch available at https://github.com/apache/kylin/pull/1694 to mitigate the vulnerability.

Long-Term Security Practices

Apart from applying the patch, organizations should implement comprehensive security measures, including regular software updates and network segmentation.

Patching and Updates

Regularly check for security updates and patches released by Apache Software Foundation to protect systems from potential security risks.