CVE-2008-6918 in ThePortal2
Summary
by MITRE
Unrestricted file upload vulnerability in admin/galeria.php in ThePortal2 2.2 allows remote attackers to execute arbitrary PHP code by uploading a file with an executable extension, then accessing it via a direct request to the file in galeria/.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability described in CVE-2008-6918 represents a critical security flaw in ThePortal2 2.2 content management system where unrestricted file upload functionality exists in the admin/galeria.php component. This vulnerability stems from inadequate input validation and file type checking mechanisms that fail to properly restrict the types of files users can upload to the server. The flaw allows remote attackers to bypass security measures by uploading malicious files with executable extensions such as php, phtml, or other server-side script extensions that can be executed by the web server. The vulnerability specifically affects the galeria/ directory where uploaded files are stored and made accessible through direct web requests.
The technical implementation of this vulnerability exploits the lack of proper file extension validation and content type checking within the file upload mechanism. Attackers can upload PHP shell scripts or malicious code that gets executed when accessed through the web server, effectively allowing remote code execution on the target system. The vulnerability is classified as a CWE-434 Unrestricted Upload of File with Dangerous Type, which directly maps to the ATT&CK technique T1190 Exploit Public-Facing Application. The flaw operates by accepting files without proper validation of their content or extension, allowing attackers to bypass restrictions through simple file renaming or by uploading files with extensions that are not properly filtered.
The operational impact of this vulnerability is severe as it provides attackers with persistent remote code execution capabilities on the affected server. Once an attacker successfully uploads a malicious file, they can execute arbitrary commands, gain access to sensitive data, escalate privileges, or use the compromised server as a launchpad for further attacks within the network. The vulnerability affects the entire web application stack since the uploaded files are stored in the galeria/ directory and accessible via direct web requests, meaning that any uploaded file can be executed immediately upon access. This creates a persistent threat vector that can be exploited repeatedly without requiring additional authentication or privileged access.
Mitigation strategies for this vulnerability require immediate implementation of multiple security controls to prevent unauthorized file uploads. Organizations should implement strict file type validation by maintaining a whitelist of allowed extensions and rejecting all other file types, while also implementing proper content validation to ensure uploaded files are legitimate. The system should enforce proper file naming conventions and avoid allowing executable extensions to be uploaded, particularly those that can be executed by the web server. Additionally, uploaded files should be stored outside the web root directory or properly configured with restrictive access controls to prevent direct execution. Security measures should include implementing proper input validation, using secure file upload libraries, and conducting regular security audits of file upload functionality. The ATT&CK framework recommends implementing network segmentation and monitoring for suspicious file upload activities to detect and prevent exploitation attempts. Organizations should also consider implementing web application firewalls and regular security testing to identify and remediate similar vulnerabilities across their application portfolio.