CVE-2019-7337 in ZoneMinder
Summary
by MITRE
Reflected Cross Site Scripting (XSS) exists in ZoneMinder through 1.32.3 as the view 'events' (events.php) insecurely displays the limit parameter value, without applying any proper output filtration. This issue exists because of the function sortHeader() in functions.php, which insecurely returns the value of the limit query string parameter without applying any filtration.
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Analysis
by VulDB Data Team • 07/06/2023
The vulnerability described in CVE-2019-7337 represents a critical reflected cross site scripting flaw within ZoneMinder version 1.32.3 and earlier. This security weakness resides in the events.php web page where the application fails to properly sanitize user input parameters, specifically the limit parameter that is passed through the query string. The flaw occurs when the application directly incorporates user-supplied data into web page output without adequate validation or encoding mechanisms, creating an environment where malicious actors can inject arbitrary script code that executes in the context of other users' browsers.
The technical root cause of this vulnerability is traced to the sortHeader() function located in functions.php, which serves as the primary point of failure in the application's input handling mechanism. This function retrieves the limit parameter from the HTTP query string and returns its value directly to the web interface without implementing any form of output sanitization or encoding. The absence of proper input validation creates an exploitable condition where an attacker can craft malicious URLs containing script payloads that will be executed when the vulnerable page is accessed. This type of vulnerability falls under the CWE-79 category, which specifically addresses Cross-Site Scripting flaws in software applications.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it can enable attackers to perform a wide range of malicious activities within the context of authenticated users. An attacker could potentially redirect victims to malicious websites, steal session cookies, modify web page content, or even execute arbitrary commands on the affected system if additional vulnerabilities exist. The reflected nature of this XSS vulnerability means that the malicious payload must be delivered through a crafted URL that the victim clicks, making social engineering an important component of exploitation. This vulnerability particularly affects ZoneMinder installations where users have administrative privileges, as the attacker could leverage the XSS to escalate privileges or access restricted functionality.
The security implications of CVE-2019-7337 align with ATT&CK technique T1059.001, which covers command and scripting interpreter execution through reflected XSS attacks. Organizations using ZoneMinder should implement immediate mitigations including input validation at the application level, output encoding for all dynamic content, and proper parameter sanitization before any user-supplied data is rendered in web pages. The recommended defense-in-depth approach includes implementing Content Security Policy headers to limit script execution, deploying web application firewalls to detect and block malicious payloads, and conducting regular security audits to identify similar input handling vulnerabilities. Additionally, upgrading to ZoneMinder version 1.32.4 or later resolves this vulnerability through proper input sanitization and output encoding mechanisms that prevent malicious script code from being executed in user browsers.