CVE-2008-3178 in WebXell Editor
Summary
by MITRE
Unrestricted file upload vulnerability in upload_pictures.php in WebXell Editor 0.1.3 allows remote attackers to execute arbitrary code by uploading a .php file with a jpeg content type, then accessing it via a direct request to the file in upload/.
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Analysis
by VulDB Data Team • 10/31/2024
The vulnerability identified as CVE-2008-3178 represents a critical unrestricted file upload flaw in the WebXell Editor version 0.1.3 web application. This vulnerability exists within the upload_pictures.php script which handles file uploads for the editor interface. The flaw allows remote attackers to bypass normal file validation mechanisms by uploading malicious PHP files disguised with jpeg content types, thereby creating a backdoor execution path within the web server environment. The vulnerability specifically affects the file upload functionality where the application fails to properly validate file extensions, content types, or file signatures, enabling attackers to upload executable code disguised as image files.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the file upload process. When a user uploads a file through upload_pictures.php, the application accepts files based solely on the content type header provided by the client rather than performing comprehensive file analysis. Attackers can manipulate the content type parameter to indicate a jpeg file while actually uploading a PHP script, which the server then stores in the upload/ directory. This misconfiguration creates a path traversal scenario where uploaded files can be executed directly through HTTP requests, bypassing normal access controls and security measures. The vulnerability maps to CWE-434 which describes the improper restriction of uploads of executable code, and represents a classic example of insecure file upload handling that violates fundamental security principles.
The operational impact of CVE-2008-3178 is severe and far-reaching for any system running the vulnerable WebXell Editor version. Successful exploitation allows attackers to execute arbitrary code with the privileges of the web server process, potentially leading to complete system compromise and persistent access. Once an attacker uploads a malicious PHP file, they can execute commands, access sensitive data, perform privilege escalation, and establish backdoors for continued access. The vulnerability also enables attackers to perform reconnaissance activities, scan internal networks, and potentially pivot to other systems within the network. This type of vulnerability commonly maps to attack techniques in the MITRE ATT&CK framework under the T1059.007 (Command and Scripting Interpreter: PHP) and T1566 (Phishing) categories, where attackers can leverage the compromised system to launch further attacks. The vulnerability's exploitation requires minimal technical skill and can be automated, making it particularly dangerous in environments where proper security controls are not in place.
Mitigation strategies for CVE-2008-3178 require comprehensive security measures addressing both the immediate vulnerability and broader architectural issues. Organizations should immediately implement proper file type validation by checking file extensions, content signatures, and MIME types against a whitelist of allowed formats. The upload directory should be configured with restrictive permissions and should not be directly accessible via web requests. Implementing a secondary validation process that analyzes file content beyond headers, using tools like file type detection utilities, can help identify disguised malicious files. Additionally, the application should employ proper input sanitization, use unique filenames for uploaded files, and implement proper access controls for uploaded content. Security headers should be configured to prevent direct execution of PHP files in upload directories, and regular security audits should be conducted to identify similar vulnerabilities. The remediation efforts should align with security best practices outlined in OWASP Top 10 and ISO 27001 standards for secure application development and deployment.