CVE-2019-9041 in zzzphp
Summary
by MITRE
An issue was discovered in ZZZCMS zzzphp V1.6.1. In the inc/zzz_template.php file, the parserIfLabel() function's filtering is not strict, resulting in PHP code execution, as demonstrated by the if:assert substring.
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Analysis
by VulDB Data Team • 09/25/2025
The vulnerability identified as CVE-2019-9041 affects ZZZCMS zzzphp version 1.6.1 and represents a critical security flaw in the template parsing mechanism. This issue resides within the inc/zzz_template.php file where the parserIfLabel() function fails to implement proper input validation and sanitization. The weakness allows attackers to execute arbitrary PHP code through carefully crafted template syntax that bypasses the intended filtering mechanisms. The vulnerability is particularly concerning because it leverages the assert function within template conditional statements, creating a direct path for code injection attacks that can be exploited without authentication.
The technical implementation of this vulnerability stems from insufficient validation of template variables and conditional statements within the parserIfLabel() function. When the system processes template content containing if:assert syntax, the filtering mechanism does not adequately sanitize the input before executing PHP code. This creates a classic code injection scenario where malicious template code can be interpreted and executed by the PHP engine. The flaw operates at the application layer and specifically targets the template engine's parsing logic, making it particularly dangerous in content management systems where users can submit template content.
From an operational perspective, this vulnerability exposes ZZZCMS installations to remote code execution attacks that can result in complete system compromise. An attacker can leverage this flaw to execute arbitrary commands on the server, potentially leading to data breaches, system infiltration, or service disruption. The impact extends beyond immediate code execution as it can enable attackers to escalate privileges, install backdoors, or use the compromised system as a launchpad for further attacks within the network. The vulnerability affects any system running the affected version of zzzphp, making it a widespread concern for organizations utilizing this CMS.
Security professionals should consider this vulnerability in the context of CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" as the underlying weakness. The ATT&CK framework categorizes this issue under T1059.007 for "Command and Scripting Interpreter: Python" and T1059.001 for "Command and Scripting Interpreter: PowerShell" as potential attack vectors, though in this case the execution occurs through PHP. Organizations should implement immediate mitigations including patching the affected software, implementing web application firewalls, and conducting thorough security audits of template systems. The vulnerability also highlights the importance of proper input validation and the principle of least privilege in template processing systems to prevent similar issues in future implementations.