CVE-2005-3102 in Movable Type
Summary
by MITRE
The administrative interface in Movable Type allows attackers to upload files with arbitrary extensions under the web root.
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Analysis
by VulDB Data Team • 07/11/2024
The vulnerability described in CVE-2005-3102 represents a critical security flaw within the Movable Type content management system that exposes organizations to significant risks through unauthorized file upload capabilities. This issue specifically targets the administrative interface of the platform, which serves as the primary entry point for content creators and system administrators to manage website assets. The flaw allows malicious actors to bypass normal file validation mechanisms and upload files with arbitrary extensions directly into the web root directory, fundamentally undermining the security posture of affected systems. The administrative interface in Movable Type typically handles various content management tasks including media file uploads, template modifications, and configuration changes, making it a prime target for exploitation. When attackers can upload files with unrestricted extensions, they gain the ability to deploy malicious code, web shells, or other harmful payloads that can compromise the entire web server infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and access control mechanisms within the file upload functionality of Movable Type's administrative interface. The system fails to properly sanitize or restrict file extensions during the upload process, allowing attackers to submit files with potentially dangerous extensions such as .php, .asp, .jsp, or other server-side script formats. This lack of proper validation creates an arbitrary file upload vulnerability that aligns with CWE-434, which specifically addresses the insecure upload of files with dangerous extensions. The flaw operates at the application layer where user inputs are not adequately filtered or validated before being processed and stored on the server. Attackers can leverage this vulnerability by crafting malicious files with extensions that will be executed by the web server when accessed, effectively bypassing traditional security controls that protect against malicious code execution. The web root directory serves as the document root for the web server, meaning that any files uploaded to this location can be directly accessed via HTTP requests, making the impact of this vulnerability particularly severe.
The operational impact of CVE-2005-3102 extends far beyond simple unauthorized file uploads, as it provides attackers with persistent access to compromised systems and enables a wide range of malicious activities. Once an attacker successfully uploads a malicious file, they can execute arbitrary code on the web server, potentially leading to complete system compromise, data exfiltration, or the establishment of backdoors for continued access. The vulnerability also creates opportunities for attackers to perform reconnaissance activities, scan internal networks, or use the compromised system as a launch point for further attacks against other systems within the organization. From an attacker's perspective, this vulnerability represents a low-effort, high-impact vector that can be exploited without requiring advanced technical skills or extensive reconnaissance. The impact on organizations using Movable Type systems is particularly concerning because the administrative interface typically requires elevated privileges, meaning that successful exploitation can provide attackers with full administrative control over the content management system. This vulnerability directly violates fundamental security principles of least privilege and proper access control, as it allows unauthorized users to gain elevated privileges through file upload mechanisms that should be strictly controlled.
Mitigation strategies for CVE-2005-3102 should focus on implementing comprehensive file upload restrictions and access control measures to prevent unauthorized file placement within the web root directory. Organizations should immediately implement proper file type validation that restricts uploads to known safe extensions and rejects potentially dangerous file types that could execute on the web server. The implementation of Content Security Policy headers and proper file validation mechanisms should be enforced at multiple levels including application-level checks, web server configurations, and filesystem permissions. Security controls should include mandatory file type verification, proper file extension filtering, and the use of secure file upload libraries that properly validate file content rather than relying solely on extension checks. Organizations should also implement network-based controls such as web application firewalls that can detect and block suspicious file upload patterns. The remediation process must include comprehensive access control reviews to ensure that only authorized administrators can access the administrative interface and that appropriate authentication mechanisms are in place. Additionally, organizations should implement regular security assessments and penetration testing to identify similar vulnerabilities within their Movable Type installations. This vulnerability demonstrates the critical importance of defense in depth strategies and proper input validation, as highlighted in the ATT&CK framework under the T1190 technique for Exploit Public-Facing Application, which specifically addresses vulnerabilities in web applications that allow arbitrary file uploads. The remediation efforts should also include proper logging and monitoring of file upload activities to detect potential exploitation attempts and establish forensic capabilities for incident response.