CVE-2009-3716 in MCshoutbox
Summary
by MITRE
Unrestricted file upload vulnerability in admin.php in MCshoutbox 1.1 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in smilies/.
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Analysis
by VulDB Data Team • 12/07/2024
The CVE-2009-3716 vulnerability represents a critical unrestricted file upload flaw in the MCshoutbox 1.1 web application's administrative component. This vulnerability exists within the admin.php file which processes file uploads without proper validation or sanitization of file extensions. The flaw allows authenticated attackers with administrative privileges to bypass security controls and upload malicious files containing executable extensions such as .php, .asp, or .jsp directly to the server. Once uploaded, these files can be executed by the web server, providing attackers with arbitrary code execution capabilities within the target system.
The technical exploitation of this vulnerability follows a predictable pattern where an authenticated user leverages their administrative access to navigate to the file upload functionality within the MCshoutbox administration interface. The vulnerability stems from inadequate input validation mechanisms that fail to properly filter or reject file extensions that could lead to code execution. This type of vulnerability aligns with CWE-434, which describes "Unrestricted Upload of File with Dangerous Type," a well-documented weakness in web application security that occurs when applications allow users to upload files without proper restrictions on file types or content validation. The flaw essentially creates a backdoor within the web application's file handling mechanism, enabling attackers to establish persistent access to the compromised system.
The operational impact of CVE-2009-3716 is severe and multifaceted, potentially allowing attackers to gain complete control over the affected web server. Once a malicious file is successfully uploaded and executed, attackers can perform various malicious activities including data exfiltration, privilege escalation, establishment of persistent backdoors, and use the compromised server as a launch point for further attacks within the network. The vulnerability's exploitation requires only authenticated access, which significantly reduces the attack surface compared to vulnerabilities requiring unauthenticated access. Additionally, the direct file access path through the smilies/ directory means that even if the upload occurs in a restricted administrative area, the malicious file becomes immediately accessible to any user who can make direct requests to the web server, amplifying the potential damage.
The security implications extend beyond immediate code execution, as this vulnerability can be leveraged for advanced persistent threat campaigns. Attackers can upload web shells or reverse shells that maintain persistence on the compromised system, enabling long-term surveillance and data theft. The vulnerability also demonstrates poor security practices in the application's development lifecycle, specifically in the areas of input validation, access control, and secure coding practices. Organizations affected by this vulnerability should implement immediate mitigations including disabling unnecessary file upload functionality, implementing strict file type validation, and restricting file upload permissions. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, with potential subsequent techniques including T1059 - Command and Scripting Interpreter and T1078 - Valid Accounts for maintaining access. Remediation efforts should include comprehensive code review, implementation of secure file upload validation mechanisms, and deployment of web application firewalls to detect and prevent such attacks.