CVE-2007-4817 in Restaurante Component For Joomla
Summary
by MITRE
Unrestricted file upload vulnerability in the Restaurante (com_restaurante) component for Joomla! allows remote attackers to upload and execute arbitrary PHP code via an upload action specifying a filename with a double extension such as .php.jpg, which creates an accessible file under img_original/.
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Analysis
by VulDB Data Team • 10/06/2024
The CVE-2007-4817 vulnerability represents a critical unrestricted file upload flaw within the Joomla! content management system's Restaurante component. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly inspect file extensions and content types during the upload process. Attackers can exploit this weakness by crafting malicious filenames with double extensions such as .php.jpg, which bypasses typical security checks that might only examine the final file extension. The vulnerability specifically affects the img_original/ directory where uploaded files are stored, making the malicious payloads directly accessible through web requests.
The technical exploitation of this vulnerability occurs through a straightforward yet dangerous process where an attacker uploads a file with a deceptive extension that appears harmless but contains executable PHP code. When the system processes the upload, it accepts the file based on the final extension (.jpg) while the actual file content remains executable PHP code. This creates a persistent threat vector where the uploaded file can be executed by the web server, allowing attackers to gain remote code execution capabilities. The vulnerability is classified under CWE-434 Unrestricted Upload of File with Dangerous Type, which specifically addresses the risk of accepting files that can be executed by the web server without proper validation.
The operational impact of CVE-2007-4817 extends beyond simple code execution, as it provides attackers with complete control over the affected Joomla installation running the affected Restaurante component, making it particularly dangerous in environments where multiple websites share common infrastructure. The threat is amplified by the fact that the attack requires minimal technical skill and can be automated using standard exploitation tools, making it a preferred target for automated scanning and exploitation campaigns.
Mitigation strategies for CVE-2007-4817 should focus on implementing robust file validation mechanisms and restricting file upload capabilities where possible. Organizations should immediately apply the vendor-supplied security patches and updates to the Restaurante component. Additionally, implementing strict file type validation that examines the actual file content rather than relying solely on extensions, removing write permissions from upload directories, and implementing proper input sanitization techniques can significantly reduce the risk. The vulnerability aligns with ATT&CK technique T1190 Exploit Public-Facing Application, which emphasizes the importance of securing web applications against file upload vulnerabilities. Network segmentation and monitoring for unusual file upload patterns can also help detect potential exploitation attempts, while regular security audits should verify that all components are updated to their latest secure versions to prevent similar vulnerabilities from being introduced through legacy or unsupported software modules.