CVE-2019-7329 in ZoneMinder
Summary
by MITRE
Reflected Cross Site Scripting (XSS) exists in ZoneMinder through 1.32.3, as the form action on multiple views utilizes $_SERVER['PHP_SELF'] insecurely, mishandling any arbitrary input appended to the webroot URL, without any proper filtration, leading to XSS.
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Analysis
by VulDB Data Team • 07/06/2023
The vulnerability CVE-2019-7329 represents a critical reflected cross site scripting flaw in ZoneMinder versions up to 1.32.3, demonstrating a fundamental failure in input validation and output sanitization within the application's web interface. This vulnerability specifically manifests in the form action attributes of multiple views where the application directly incorporates $_SERVER['PHP_SELF'] into the HTML output without adequate sanitization or validation. The insecure use of server variables creates an opportunity for malicious actors to inject arbitrary script code through URL parameters, as the application fails to properly filter or escape user-supplied input before rendering it in the browser context.
The technical implementation of this vulnerability stems from the application's reliance on $_SERVER['PHP_SELF'] which contains the filename of the currently executing script, including any query string parameters that may have been appended to the URL. When ZoneMinder's views process this server variable without proper sanitization, any malicious input appended to the webroot URL becomes part of the form action attribute, creating a reflected XSS vector. This flaw falls under CWE-79, which specifically addresses Cross-Site Scripting vulnerabilities, and more precisely aligns with CWE-74, which deals with injection flaws where untrusted data is incorporated into generated code without proper validation or escaping. The vulnerability operates at the application layer and can be exploited through carefully crafted URLs that contain malicious script payloads.
The operational impact of this vulnerability is significant as it allows remote attackers to execute arbitrary JavaScript code within the context of a victim's browser session. An attacker could craft malicious URLs that, when visited by an authenticated user, would execute scripts that could steal session cookies, redirect users to malicious sites, or perform unauthorized actions within the ZoneMinder application. The reflected nature of this XSS means that the malicious script payload is reflected back to the victim through the web application's response, making it particularly dangerous as it can be delivered through email links, chat messages, or any other means of sharing URLs. This vulnerability affects users who have access to the ZoneMinder web interface, potentially compromising the entire surveillance system if attackers can escalate their privileges or manipulate the application's functionality.
Mitigation strategies for CVE-2019-7329 should focus on implementing proper input validation and output sanitization measures throughout the ZoneMinder application. The primary fix involves replacing the insecure use of $_SERVER['PHP_SELF'] with properly sanitized and validated input handling, ensuring that all user-supplied data is filtered before being incorporated into HTML output. Organizations should implement Content Security Policy headers to limit the sources from which scripts can be executed, and apply proper HTML escaping techniques to all dynamic content. Additionally, the application should validate and sanitize all URL parameters before using them in form actions or other HTML attributes. This vulnerability demonstrates the importance of following secure coding practices as outlined in the OWASP Top Ten and aligns with ATT&CK technique T1203, which covers exploitation of web application vulnerabilities for code execution. Regular security audits and input validation testing should be implemented to prevent similar issues in future releases.