CVE-2018-14971 in QCMS
Summary
by MITRE
An issue was discovered in QCMS 3.0.1. upload/System/Controller/backend/user.php has XSS.
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Analysis
by VulDB Data Team • 03/13/2020
The vulnerability identified as CVE-2018-14971 represents a cross-site scripting flaw within the QCMS 3.0.1 content management system, specifically in the backend user management component. This issue resides in the upload/System/Controller/backend/user.php file, where insufficient input validation and output encoding mechanisms fail to properly sanitize user-supplied data before it is processed and rendered back to users. The flaw allows malicious actors to inject arbitrary JavaScript code into the application's response, creating a persistent threat vector that can be exploited across multiple user sessions.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a critical security weakness in web applications. The attack surface is particularly concerning as it affects the backend user management interface, potentially providing attackers with elevated privileges or access to sensitive administrative functions. The XSS vulnerability can be leveraged to steal session cookies, perform unauthorized actions on behalf of authenticated users, or redirect victims to malicious websites. According to ATT&CK framework, this represents a technique categorized under T1059.007 for Scripting and T1531 for Account Access Removal, demonstrating the potential for privilege escalation and credential theft.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable attackers to compromise the entire administrative backend of the CMS. When an authenticated user with administrative privileges loads the affected page, the malicious JavaScript code executes in their browser context, potentially allowing for complete system takeover. The vulnerability is particularly dangerous because it affects the core user management functionality, which is frequently accessed by administrators. Attackers can craft malicious payloads that persist in the system, making them difficult to detect and remove. The flaw demonstrates poor security hygiene in input sanitization and output encoding practices, which are fundamental requirements for preventing XSS attacks according to OWASP Top Ten and other industry security standards.
Mitigation strategies for this vulnerability should include immediate implementation of proper input validation and output encoding mechanisms throughout the application. The development team must ensure that all user-supplied data is properly sanitized before being processed or displayed, utilizing context-appropriate encoding techniques such as HTML entity encoding for web content. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be executed. Regular security code reviews and automated vulnerability scanning should be implemented to identify similar issues in other components of the application. The system should also enforce strict access controls and monitoring of administrative user activities to detect potential exploitation attempts. Organizations using QCMS 3.0.1 should urgently apply patches or updates provided by the vendor, as this vulnerability represents a significant risk to system integrity and user data confidentiality.