CVE-2021-34418 : Security Advisory and Response

This article provides detailed information about CVE-2021-34418, a vulnerability in the web console of Zoom On-Premise Meeting Connector versions prior to 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR versions prior to 4.6.239.20200613, Zoom On-Premise Recording Connector versions prior to 3.8.42.20200905, Zoom On-Premise Virtual Room Connector versions prior to 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer versions prior to 2.5.5492.20200616.

Understanding CVE-2021-34418

This section delves into the description, impact, and technical details of the CVE.

What is CVE-2021-34418?

The vulnerability arises due to a failure in validating NULL bytes during the authentication process, potentially leading to a crash in the login service.

The Impact of CVE-2021-34418

The CVSS v3.1 base score for this CVE is 4, categorizing it as a MEDIUM severity issue with LOW attack complexity and LOW availability impact.

Technical Details of CVE-2021-34418

This section covers the specifics of the vulnerability, affected systems, and exploitation.

Vulnerability Description

The login routine of the affected Zoom products fails to validate the presence of a NULL byte during authentication, allowing for potential exploitation.

Affected Systems and Versions

The CVE affects Zoom On-Premise Meeting Connector, Zoom On-Premise Meeting Connector MMR, Zoom On-Premise Recording Connector, Zoom On-Premise Virtual Room Connector, and Zoom On-Premise Virtual Room Connector Load Balancer versions specified.

Exploitation Mechanism

Exploitation involves sending a NULL byte during the authentication process, potentially causing a crash in the login service.

Mitigation and Prevention

This section outlines immediate steps and long-term security practices to mitigate the risks associated with CVE-2021-34418.

Immediate Steps to Take

Users are advised to update the affected Zoom products to the patched versions to prevent exploitation of this vulnerability.

Long-Term Security Practices

Incorporating rigorous input validation mechanisms and regular security updates can help enhance the overall security posture to prevent similar vulnerabilities.

Patching and Updates

Zoom Video Communications Inc. has released patched versions for the affected products to address the vulnerability. It is essential to promptly apply these updates to secure the systems.