CVE-2022-23134 in Zabbix
Summary
by MITRE • 01/13/2022
After the initial setup process, some steps of setup.php file are reachable not only by super-administrators, but by unauthenticated users as well. Malicious actor can pass step checks and potentially change the configuration of Zabbix Frontend.
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Analysis
by VulDB Data Team • 09/18/2024
The vulnerability identified as CVE-2022-23134 represents a critical access control flaw within the Zabbix monitoring platform's web interface setup process. This issue manifests in the setup.php file where the initial configuration workflow fails to properly enforce authentication requirements, allowing unauthorized users to bypass the standard administrative access controls. The flaw occurs specifically during the post-initialization setup phase, where certain configuration steps remain accessible to any user without proper authorization, creating a significant security gap in the system's defensive posture.
The technical nature of this vulnerability stems from improper input validation and authentication checks within the setup.php script. When Zabbix undergoes its initial installation, the system should enforce strict administrative privileges for all subsequent configuration steps to prevent unauthorized modifications. However, the flaw allows unauthenticated users to navigate through these steps and potentially alter critical frontend settings, effectively providing a backdoor into the system's configuration management. This misconfiguration creates a path for attackers to manipulate the monitoring environment's core parameters, potentially leading to data exposure, service disruption, or further compromise of the infrastructure.
From an operational impact perspective, this vulnerability exposes Zabbix installations to immediate exploitation by malicious actors who can leverage the unauthenticated access to modify system configurations. The attack surface expands significantly as any individual with access to the web interface can attempt to manipulate the setup process, potentially leading to unauthorized changes in monitoring parameters, user permissions, or system behavior. The implications extend beyond simple configuration changes, as attackers could potentially use this access to establish persistence within the monitoring infrastructure, making detection and remediation more challenging for security teams.
The vulnerability aligns with CWE-284, which addresses improper access control in software systems, and demonstrates clear characteristics of privilege escalation through weakened authentication mechanisms. From an adversary perspective, this flaw maps directly to ATT&CK technique T1068, which involves the use of elevated privileges to gain access to system resources. Organizations utilizing Zabbix are particularly vulnerable as this issue affects the foundational configuration process, potentially compromising the integrity of the entire monitoring ecosystem and creating opportunities for attackers to manipulate security events or disable critical monitoring functions.
Mitigation strategies should focus on immediate patching of affected Zabbix versions and implementation of network-level controls to restrict access to the setup.php file. Security teams must ensure that all administrative interfaces are properly secured and that authentication requirements are enforced throughout the entire configuration lifecycle. Additionally, organizations should implement regular access reviews and monitoring of configuration changes to detect unauthorized modifications. The remediation process should include disabling the setup.php file after initial configuration completion and ensuring that all administrative access points are protected through proper authentication mechanisms. Network segmentation and firewall rules should be implemented to prevent unauthorized access to the web interface during setup phases, while regular security assessments should verify that no unauthorized configuration changes have occurred.