CVE-2017-7625 in Fiyo
Summary
by MITRE
In Fiyo CMS 2.x through 2.0.7, attackers may upload a webshell via the content parameter to "/dapur/apps/app_theme/libs/save_file.php" and then execute code.
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Analysis
by VulDB Data Team • 08/28/2020
The vulnerability identified as CVE-2017-7625 represents a critical remote code execution flaw in Fiyo CMS versions 2.x through 2.0.7, specifically within the application's file upload functionality. This vulnerability stems from inadequate input validation and insufficient access controls within the content management system's administrative interface. The affected endpoint "/dapur/apps/app_theme/libs/save_file.php" accepts user-supplied content parameters without proper sanitization, creating an exploitable path for malicious actors to upload malicious files including webshells that can execute arbitrary code on the target server.
The technical implementation of this vulnerability aligns with CWE-434, which describes insecure file upload vulnerabilities where applications accept files from untrusted sources without proper validation. Attackers can exploit this weakness by crafting malicious payloads and submitting them through the content parameter, bypassing normal file upload restrictions. The vulnerability operates at the application layer, specifically targeting the CMS's theme management functionality, where legitimate users might expect to upload only safe content such as images or CSS files. However, the lack of proper file type checking and content validation allows attackers to upload executable PHP files that can be executed within the web server context.
The operational impact of this vulnerability is severe and multifaceted, providing attackers with complete control over the affected server. Once a webshell is successfully uploaded and executed, adversaries can perform various malicious activities including data exfiltration, privilege escalation, establishment of persistent backdoors, and use the compromised server as a launchpad for further attacks within the network. The vulnerability affects the confidentiality, integrity, and availability of the system, potentially leading to complete system compromise and unauthorized access to sensitive data stored within the CMS. According to ATT&CK framework, this vulnerability maps to T1190 (Exploit Public-Facing Application) and T1059.007 (Command and Scripting Interpreter: PHP), demonstrating how attackers can leverage web application vulnerabilities to achieve their objectives.
Mitigation strategies for CVE-2017-7625 should include immediate patching of the affected Fiyo CMS versions to the latest secure releases, implementation of strict file upload validation mechanisms, and enforcement of proper access controls. Organizations should deploy web application firewalls to monitor and filter suspicious upload attempts, conduct regular security audits of file upload functionality, and implement least privilege principles for file system permissions. The vulnerability also underscores the importance of input validation and output encoding practices, as recommended by OWASP Top Ten and NIST cybersecurity guidelines, to prevent similar issues in future deployments. Additionally, security monitoring should be enhanced to detect unusual file upload patterns and unauthorized access attempts to administrative endpoints.