CVE-2005-4422 in toendaCMS
Summary
by MITRE
Unrestricted file upload vulnerability in toendaCMS before 0.6.2 Stable allows remote authenticated administrators to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in data/images/albums.
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Analysis
by VulDB Data Team • 06/11/2019
The vulnerability described in CVE-2005-4422 represents a critical security flaw in toendaCMS versions prior to 0.6.2 Stable that enables authenticated administrators to bypass file upload restrictions and execute arbitrary code on the affected system. This vulnerability operates through a direct path that allows malicious actors with administrative privileges to upload potentially harmful files to the server, creating a persistent backdoor for code execution.
The technical implementation of this flaw stems from insufficient input validation and sanitization within the file upload functionality of toendaCMS. When administrators upload files through the web interface, the system fails to properly validate file extensions, content types, or file contents against a whitelist of allowed formats. This unrestricted upload capability permits the placement of executable files with extensions such as .php, .asp, .jsp, or other server-side scripting languages directly into the data/images/albums directory. The vulnerability specifically targets the image upload functionality, which is commonly used for media management but becomes a vector for code execution when proper restrictions are not enforced.
From an operational impact perspective, this vulnerability creates a significant risk for organizations using toendaCMS, as it allows for complete system compromise when exploited by authenticated users. The attacker can upload web shells, malicious scripts, or other executable code that persists on the server and can be executed through direct HTTP requests to the uploaded files. This creates a persistent threat vector that can be used for data exfiltration, system reconnaissance, privilege escalation, or as a staging ground for further attacks within the network. The direct access path through the data/images/albums directory means that the uploaded files can be immediately executed without requiring additional exploitation steps, making this vulnerability particularly dangerous.
The vulnerability aligns with CWE-434, which describes unrestricted upload of executable code, and represents a classic example of insecure file handling practices that enable attackers to execute arbitrary code on web servers. From an attack perspective, this vulnerability maps to several ATT&CK tactics including execution through legitimate system processes and privilege escalation when combined with administrative access. The attack chain typically involves gaining administrative credentials through social engineering, credential theft, or other means, then leveraging the unrestricted upload functionality to place malicious files on the server. Once uploaded, the attacker can access these files directly through HTTP requests, potentially leading to complete system compromise and persistent access.
Organizations should implement multiple layers of mitigation to address this vulnerability. Immediate remediation involves upgrading to toendaCMS version 0.6.2 Stable or later, which includes proper file validation and sanitization measures. Additionally, administrators should implement strict file type validation that rejects executable extensions, enforce proper file extension whitelisting, and implement content-type checking to prevent malicious files from being accepted. The system should also employ proper file permissions and directory isolation to prevent direct execution of uploaded files. Network-level protections including web application firewalls and intrusion detection systems can provide additional monitoring and blocking capabilities for suspicious file upload activities. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications and ensure that file upload functionalities are properly secured against similar threats.