CVE-2017-11178 in FineCMS
Summary
by MITRE
In FineCMS through 2017-07-11, application/core/controller/style.php allows remote attackers to write to arbitrary files via the contents and filename parameters in a route=style action. For example, this can be used to overwrite a .php file because the file extension is not checked.
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Analysis
by VulDB Data Team • 10/24/2019
The vulnerability identified as CVE-2017-11178 represents a critical file write flaw in FineCMS versions up to 2017-07-11, specifically within the application/core/controller/style.php component. This issue enables remote attackers to execute arbitrary file operations through manipulated parameters in the route=style action, creating a significant security risk for affected systems. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly verify file extensions or paths before allowing file operations to proceed. Attackers can exploit this weakness by crafting malicious requests that include both contents and filename parameters, potentially leading to unauthorized file modifications or creations across the target system.
The technical implementation of this vulnerability demonstrates a classic path traversal and file injection flaw that aligns with CWE-22 Path Traversal and CWE-94 Code Injection categories. The absence of proper file extension validation creates an opportunity for attackers to overwrite critical system files including php scripts, which could result in arbitrary code execution or complete system compromise. The vulnerability operates through the application's style management functionality, which typically handles template and configuration file modifications, but lacks proper access controls or file validation mechanisms to prevent unauthorized file system operations. This flaw essentially allows attackers to bypass normal file system permissions and write content to any location where the application has write privileges.
From an operational impact perspective, this vulnerability poses severe risks to organizations using affected FineCMS versions, as it can be exploited remotely without authentication requirements. Attackers can leverage this weakness to upload malicious code, overwrite legitimate system files, or modify existing php scripts to gain persistent access to the target environment. The attack surface extends beyond simple file manipulation to include potential privilege escalation and lateral movement within compromised networks. The vulnerability's exploitation potential is amplified by the fact that it can be triggered through standard web requests, making it easily accessible to attackers with basic technical knowledge. This weakness directly violates fundamental security principles of least privilege and input validation, creating opportunities for complete system compromise and data exfiltration.
Organizations should implement immediate mitigations including applying the latest security patches released by FineCMS developers, implementing proper input validation for all file operations, and restricting write permissions for web application directories. Network-level protections such as web application firewalls should be configured to block suspicious file upload patterns and parameter manipulation attempts. System administrators must conduct comprehensive security audits to identify and remediate similar vulnerabilities across other components of the application stack. The implementation of proper access controls and file extension validation mechanisms should be enforced throughout the application to prevent similar issues. Additionally, monitoring and logging of file system operations should be enhanced to detect and respond to unauthorized file modifications. This vulnerability highlights the critical importance of secure coding practices and proper input validation as outlined in the OWASP Top Ten and MITRE ATT&CK framework categories related to command injection and privilege escalation techniques.