CVE-2008-0805 in Medias Phpizabi
Summary
by MITRE
Unrestricted file upload vulnerability in image.php in PHPizabi 0.848b C1 HFP1 allows remote attackers to execute arbitrary code by uploading a file with an executable extension from the event page, then accessing it via a direct request to the file in system/cache/pictures.
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Analysis
by VulDB Data Team • 10/17/2024
The vulnerability identified as CVE-2008-0805 represents a critical unrestricted file upload flaw within the PHPizabi content management system version 0.848b C1 HFP1. This vulnerability exists in the image.php script which processes file uploads from the event page functionality. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly verify the file types being uploaded, allowing malicious actors to bypass security restrictions and upload potentially harmful files to the target system.
The technical exploitation of this vulnerability follows a specific attack pattern where remote attackers can upload files with executable extensions such as .php, .asp, or .jsp to the system. The uploaded files are stored in the system/cache/pictures directory, making them directly accessible via web requests. This creates a path for arbitrary code execution since the web server will process and execute any executable files placed in this directory. The vulnerability is particularly dangerous because it allows attackers to gain persistent access to the target system and execute malicious code with the privileges of the web server process.
From an operational impact perspective, this vulnerability enables attackers to establish backdoors, deploy malware, or gain full control over the compromised system. The attack chain begins with uploading a malicious file through the event page interface, followed by direct access to the uploaded file via a web request to the cache directory. This vulnerability directly maps to CWE-434 Unrestricted Upload of File with Dangerous Type, which is classified as a high-risk weakness in the CWE taxonomy. The vulnerability also aligns with ATT&CK technique T1190 for Exploit Public-Facing Application, and T1059 for Command and Scripting Interpreter, as it allows for command execution through uploaded scripts.
The security implications extend beyond immediate code execution to include potential privilege escalation and persistent access. Attackers can upload web shells or other malicious payloads that provide them with ongoing access to the compromised system. The vulnerability's impact is amplified by the fact that it requires no authentication to exploit, making it particularly dangerous in publicly accessible environments. Organizations running PHPizabi versions affected by this vulnerability face significant risk of data breaches, system compromise, and potential use as a launchpad for further attacks within their network infrastructure. The vulnerability demonstrates a fundamental flaw in the application's security architecture, specifically in its file upload validation mechanisms.
Mitigation strategies for this vulnerability require immediate implementation of proper file type validation and sanitization. Organizations should ensure that all file uploads are strictly validated against a whitelist of allowed extensions and MIME types. The system should also implement proper file naming conventions that prevent executable files from being executed directly. Additionally, the cache directory should be configured with appropriate permissions and access controls to prevent direct web access to uploaded files. The recommended approach includes implementing a multi-layered defense strategy that combines input validation, proper file handling, and access control mechanisms. Security patches should be applied immediately to address the vulnerability, and the system should be monitored for signs of exploitation attempts. The vulnerability serves as a critical reminder of the importance of secure file upload handling and the necessity of implementing comprehensive security controls in web applications.