CVE-2021-27927 : Vulnerability Insights and Analysis

A CSRF protection mechanism is lacking in Zabbix versions prior to 4.0.28rc1, 5.0.10rc1, 5.2.6rc1, and 5.4.0beta2, in the CControllerAuthenticationUpdate controller. This could allow an attacker to make unauthorized changes.

Understanding CVE-2021-27927

This section delves into the details of the CSRF vulnerability in Zabbix.

What is CVE-2021-27927?

The CVE-2021-27927 vulnerability exists in Zabbix due to the absence of a CSRF protection mechanism in the CControllerAuthenticationUpdate controller.

The Impact of CVE-2021-27927

The lack of CSRF protection exposes Zabbix systems to unauthorized access and potential exploitation by malicious actors.

Technical Details of CVE-2021-27927

Explore the technical aspects related to the CVE-2021-27927 vulnerability.

Vulnerability Description

The CControllerAuthenticationUpdate controller in affected Zabbix versions lacks CSRF protection, enabling attackers to exploit the system.

Affected Systems and Versions

All Zabbix versions before 4.0.28rc1, 5.0.10rc1, 5.2.6rc1, and 5.4.0beta2 are affected by this vulnerability.

Exploitation Mechanism

Attackers do not require Zabbix user login credentials but need to possess the correct Zabbix URL and user contact information with adequate privileges.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2021-27927 vulnerability.

Immediate Steps to Take

Users should update Zabbix to versions 4.0.28rc1, 5.0.10rc1, 5.2.6rc1, or 5.4.0beta2 that address the CSRF protection issue.

Long-Term Security Practices

Implementing strong access control mechanisms and regular security audits can enhance Zabbix system security.

Patching and Updates

Regularly applying security patches and staying updated on Zabbix releases can help protect systems from vulnerabilities.