CVE-2009-3173 in The Rat CMS
Summary
by MITRE
Unrestricted file upload vulnerability in admin/add_album.php in The Rat CMS Alpha 2 allows remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in images/.
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Analysis
by VulDB Data Team • 12/10/2024
The vulnerability identified as CVE-2009-3173 represents a critical unrestricted file upload flaw within The Rat CMS Alpha 2 content management system. This weakness exists in the administrative component at admin/add_album.php, where the application fails to properly validate file extensions and content types during the upload process. The vulnerability stems from inadequate input sanitization and lack of proper file type verification mechanisms that would normally prevent the upload of executable or potentially malicious files.
The technical exploitation of this vulnerability occurs when a remote attacker uploads a file with an executable extension such as .php, .asp, .jsp, or other server-executable formats to the images/ directory through the vulnerable administrative interface. Once uploaded, the malicious file becomes accessible via direct HTTP requests to the images/ directory, allowing attackers to execute arbitrary code on the target server with the privileges of the web application. This type of vulnerability is classified as CWE-434, which specifically addresses the insecure upload of executable files, and represents a fundamental failure in the application's security architecture.
The operational impact of this vulnerability is severe and far-reaching, as it provides attackers with complete control over the compromised server. Successful exploitation enables attackers to execute arbitrary commands, install backdoors, steal sensitive data, modify website content, or use the compromised server as a launchpad for further attacks against internal networks. The vulnerability affects the confidentiality, integrity, and availability of the system, making it a critical concern for any organization relying on The Rat CMS Alpha 2. According to ATT&CK framework, this vulnerability maps to T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter, representing the attack paths that adversaries would typically follow to achieve their objectives.
Mitigation strategies for this vulnerability require immediate implementation of multiple security controls. Organizations should first implement strict file type validation that checks both file extensions and MIME types against a whitelist of allowed formats such as .jpg, .png, and .gif. The upload directory should be configured with restrictive permissions and should not be executable. Additionally, uploaded files should be renamed to prevent predictable filenames and stored outside the web root directory. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities. The principle of least privilege should be enforced, ensuring that administrative upload functionality is restricted to authorized personnel only. Organizations should also implement proper logging and monitoring to detect suspicious upload activities and consider implementing web application firewalls to block malicious upload attempts. This vulnerability highlights the critical importance of secure file handling practices and demonstrates how seemingly simple oversights in input validation can lead to complete system compromise.