CVE-2007-6689 in Menalto
Summary
by MITRE
Menalto Gallery before 2.2.4 does not properly check for malicious file extensions during file uploads, which allows attackers to execute arbitrary code via the (1) Core application or (2) MIME module.
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Analysis
by VulDB Data Team • 08/05/2019
The vulnerability described in CVE-2007-6689 affects Menalto Gallery versions prior to 2.2.4, representing a critical security flaw in web application file upload validation mechanisms. This issue stems from insufficient input sanitization and validation processes that fail to properly verify file extensions during the upload process, creating a pathway for malicious code execution. The vulnerability specifically impacts two core components of the Gallery application including the Core application and the MIME module, demonstrating the widespread nature of the flawed validation logic across multiple system layers.
The technical flaw manifests through improper file extension validation that allows attackers to bypass security checks by uploading files with malicious extensions or by exploiting the application's handling of file type detection. This weakness enables attackers to upload files containing executable code or scripts that can be executed within the web server context, potentially leading to complete system compromise. The vulnerability operates at the intersection of several security domains including web application security, file handling validation, and privilege escalation mechanisms, making it particularly dangerous in environments where the Gallery application processes user-uploaded content.
The operational impact of this vulnerability extends beyond simple code execution capabilities to encompass potential complete system compromise, data theft, and service disruption. Attackers can leverage this flaw to upload web shells, backdoors, or other malicious payloads that persist within the application environment, allowing for ongoing unauthorized access. The vulnerability's presence in both the Core application and MIME module components suggests that the attack surface is broad and that multiple vectors exist for exploitation, increasing the likelihood of successful compromise. This type of vulnerability directly aligns with CWE-434, which addresses insecure file upload handling, and represents a classic example of how insufficient input validation can lead to remote code execution.
The exploitation of this vulnerability requires minimal technical skill and can be automated through various attack vectors, making it particularly dangerous for widespread deployment. Attackers typically need only to craft malicious files with extensions that bypass the validation checks, often using techniques such as double extensions or leveraging the application's MIME type detection failures. The lack of proper file extension filtering and validation creates an environment where malicious files can be seamlessly integrated into the application's file system, potentially leading to privilege escalation and further system infiltration. This vulnerability also maps to several ATT&CK techniques including T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, demonstrating the multi-faceted nature of the threat.
Mitigation strategies for this vulnerability must address both the immediate security gap and broader application security practices. Organizations should immediately upgrade to Menalto Gallery version 2.2.4 or later, which includes proper file extension validation and sanitization mechanisms. Additionally, implementing comprehensive file type validation at multiple layers including client-side, server-side, and database-level checks provides defense in depth. Security measures should include strict file extension whitelisting, MIME type verification, and implementation of file content analysis to prevent execution of malicious code. Network-level protections such as web application firewalls and intrusion detection systems can provide additional monitoring and blocking capabilities for suspicious upload activities, while regular security assessments and code reviews help identify similar vulnerabilities in other applications.