CVE-2017-11629 in FineCMS
Summary
by MITRE
dayrui FineCms through 5.0.10 has Cross Site Scripting (XSS) in controllers/api.php via the function parameter in a c=api&m=data2 request.
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Analysis
by VulDB Data Team • 12/29/2019
The vulnerability identified as CVE-2017-11629 affects dayrui FineCms versions through 5.0.10 and represents a critical cross site scripting flaw that can be exploited by malicious actors to execute arbitrary JavaScript code within the context of a victim's browser. This vulnerability resides within the api.php controller file and specifically targets the function parameter in c=api&m=data2 requests, making it particularly dangerous as it leverages the application's legitimate API endpoints to deliver malicious payloads. The flaw allows attackers to inject malicious scripts that can persist in the application's data handling mechanisms, potentially compromising user sessions and enabling further exploitation.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the FineCms framework's API handling component. When the application processes requests containing the function parameter through the specified endpoint, it fails to properly sanitize user-supplied input before incorporating it into dynamic content generation. This omission creates a direct pathway for attackers to inject malicious JavaScript code that executes when other users view the affected content. The vulnerability aligns with CWE-79, which specifically addresses cross site scripting flaws in web applications, and represents a classic example of how inadequate sanitization of user input can lead to persistent XSS vulnerabilities in content management systems.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to steal session cookies, perform unauthorized actions on behalf of users, and potentially gain deeper access to the underlying system. Attackers can leverage this vulnerability to establish persistent backdoors, harvest sensitive information, or redirect users to malicious sites that can further compromise their systems. The exposure of the vulnerability through legitimate API endpoints makes detection more challenging since the malicious requests may appear as normal application traffic. This characteristic also increases the attack surface significantly, as the vulnerability can be exploited through various attack vectors including social engineering campaigns that prompt users to click on malicious links or through automated scanning tools that target known vulnerable endpoints.
Security professionals should implement comprehensive mitigation strategies that include input validation, output encoding, and proper parameter sanitization across all API endpoints. The recommended approach involves implementing strict validation of the function parameter to ensure it contains only expected values and properly encoding all dynamic content before rendering. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts and establish proper access controls for API endpoints. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other components of the application. This vulnerability demonstrates the critical importance of secure coding practices and proper input validation in web applications, particularly in content management systems that handle user-generated content and provide API access points. The implementation of the OWASP Top Ten security controls, specifically those addressing input validation and output encoding, should be prioritized to prevent similar vulnerabilities from occurring in the future.