CVE-2021-26919 : Exploit Details and Defense Strategies
Learn about CVE-2021-26919, a vulnerability in Apache Druid allowing authenticated users to run arbitrary code from malicious MySQL databases. Understand the impact, technical details, and mitigation steps.
Apache Druid allows users to read data from other database systems using JDBC. This functionality is to allow trusted users with the proper permissions to set up lookups or submit ingestion tasks. 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 Druid server processes. This issue was addressed in Apache Druid 0.20.2.
Understanding CVE-2021-26919
This CVE pertains to Apache Druid where authenticated users can execute arbitrary code from malicious MySQL database systems.
What is CVE-2021-26919?
It is a vulnerability in Apache Druid that enables users to execute arbitrary code from a malicious MySQL database system.
The Impact of CVE-2021-26919
The vulnerability allows attackers to execute arbitrary code within Druid server processes, potentially leading to unauthorized access and data breaches.
Technical Details of CVE-2021-26919
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The MySQL JDBC driver properties in Apache Druid, if not mitigated, can be exploited by attackers to execute arbitrary code.
Affected Systems and Versions
Apache Druid versions <= 0.20.1 are affected by this vulnerability.
Exploitation Mechanism
Attackers can take advantage of specific properties in the MySQL JDBC driver to launch arbitrary code execution within the Druid server processes.
Mitigation and Prevention
To safeguard systems from CVE-2021-26919, consider the following measures:
Immediate Steps to Take
- Upgrade to Apache Druid 0.20.2
- Enable new Druid configurations to mitigate vulnerable MySQL JDBC properties
- Restrict network access to cluster machines to trusted hosts only
Long-Term Security Practices
- Ensure users have the minimum set of Druid permissions necessary
- Limit access to functionalities that users do not require
Patching and Updates
Regularly check for updates and patches released by Apache Druid to address security vulnerabilities.