CVE-2019-8427 in ZoneMinder
Summary
by MITRE
daemonControl in includes/functions.php in ZoneMinder before 1.32.3 allows command injection via shell metacharacters.
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Analysis
by VulDB Data Team • 07/11/2023
The vulnerability identified as CVE-2019-8427 represents a critical command injection flaw within the ZoneMinder surveillance system software. This issue exists in the daemonControl function located within the includes/functions.php file of ZoneMinder versions prior to 1.32.3. The vulnerability arises from inadequate input validation and sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into system commands. Attackers can exploit this weakness by injecting shell metacharacters such as semicolons, ampersands, or backticks into the affected parameter, thereby enabling arbitrary command execution on the underlying operating system. The impact is particularly severe given that ZoneMinder is widely deployed for security monitoring and surveillance purposes, making it a prime target for malicious actors seeking persistent access to networked environments.
The technical implementation of this vulnerability stems from improper handling of user input within the daemonControl function, which serves as a bridge between web interface interactions and system-level command execution. When legitimate administrative users interact with the ZoneMinder web interface to control daemon processes, the system fails to properly sanitize the input parameters before passing them to shell execution functions. This creates a direct pathway for attackers to inject malicious commands that get executed with the privileges of the web server process, typically running with elevated permissions. The vulnerability maps directly to CWE-77, which specifically addresses Command Injection, and aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, demonstrating how attackers can leverage web application vulnerabilities to execute arbitrary code on target systems.
The operational impact of CVE-2019-8427 extends beyond simple privilege escalation to encompass full system compromise and potential lateral movement within networked environments. An attacker who successfully exploits this vulnerability gains the ability to execute commands with the privileges of the ZoneMinder service account, which often includes access to system files, network interfaces, and potentially other connected systems. This could lead to data exfiltration, system persistence mechanisms, or the establishment of command and control channels. The vulnerability affects organizations that rely on ZoneMinder for security monitoring, particularly those in sectors such as retail, healthcare, and industrial control systems where surveillance infrastructure is critical. Organizations using older versions of ZoneMinder may find their entire security monitoring ecosystem compromised, potentially exposing sensitive surveillance data and creating backdoors for further attacks.
Mitigation strategies for CVE-2019-8427 should prioritize immediate patching of ZoneMinder installations to version 1.32.3 or later, which includes proper input validation and sanitization measures. Organizations should also implement network segmentation to limit access to ZoneMinder web interfaces, particularly by restricting administrative access to trusted networks and implementing multi-factor authentication for administrative accounts. Additional defensive measures include monitoring for suspicious command execution patterns, implementing web application firewalls to detect and block malicious input patterns, and conducting regular security assessments of surveillance infrastructure. System administrators should also consider implementing least privilege principles for ZoneMinder services, ensuring that the web application runs with minimal required permissions and that input validation is enforced at multiple layers of the application architecture. The vulnerability highlights the importance of secure coding practices and input validation in web applications, particularly those handling system-level operations that could provide attackers with elevated privileges and access to critical infrastructure components.