CVE-2021-20328 : Security Advisory and Response
Discover the impact of CVE-2021-20328 on Java driver versions supporting client-side field level encryption. Learn about the vulnerability, affected systems, and mitigation steps.
CVE-2021-20328 pertains to specific versions of the Java driver that support client-side field level encryption (CSFLE) failing to perform correct host name verification on the KMS server's certificate. This article delves into the details of the vulnerability, its impact, technical details, and mitigation strategies.
Understanding CVE-2021-20328
This section provides insight into what CVE-2021-20328 entails.
What is CVE-2021-20328?
The vulnerability affects versions of the Java driver supporting CSFLE, leading to improper host name verification on the KMS server’s certificate. This could enable a Man-in-the-Middle (MITM) attack, compromising the Field Level Encryption.
The Impact of CVE-2021-20328
The vulnerability could result in an interception of traffic between the Java driver and the KMS service, rendering Field Level Encryption ineffective. It affects all CSFLE-supported Java driver versions.
Technical Details of CVE-2021-20328
This section delves into the technical aspects of CVE-2021-20328.
Vulnerability Description
The Java driver vulnerability allows for active MITM attacks due to incorrect host name verification, impacting the effectiveness of Field Level Encryption.
Affected Systems and Versions
Versions of mongo-java-driver, mongodb-driver, mongodb-driver-sync, and mongodb-driver-legacy are affected, including versions up to 3.12.7 and 4.2.0.
Exploitation Mechanism
The vulnerability could be exploited by malicious actors with a privileged network position to intercept traffic between the Java driver and the KMS service.
Mitigation and Prevention
This section outlines measures to mitigate and prevent CVE-2021-20328.
Immediate Steps to Take
Users should update affected Java driver versions to mitigate the vulnerability. Implement network security controls to prevent MITM attacks.
Long-Term Security Practices
Regularly update software, utilize encryption mechanisms, and monitor network traffic for any unusual patterns.
Patching and Updates
Stay informed about security patches released by MongoDB Inc. to address CVE-2021-20328 and apply them promptly to secure systems.