CVE-2024-3705 in OpenGnsys
Summary
by MITRE • 04/12/2024
Unrestricted file upload vulnerability in OpenGnsys affecting version 1.1.1d (Espeto). This vulnerability allows an attacker to send a POST request to the endpoint '/opengnsys/images/M_Icons.php' modifying the file extension, due to lack of file extension verification, resulting in a webshell injection.
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Analysis
by VulDB Data Team • 07/05/2024
The vulnerability identified as CVE-2024-3705 represents a critical security flaw in OpenGnsys version 1.1.1d known as Espeto, which exposes the system to unauthorized file upload operations. This issue stems from insufficient input validation mechanisms within the application's file handling processes, specifically targeting the '/opengnsys/images/M_Icons.php' endpoint. The flaw allows malicious actors to bypass normal file extension checks through crafted POST requests, enabling them to upload files with potentially dangerous extensions that could execute arbitrary code on the target server.
The technical exploitation of this vulnerability occurs through a simple yet effective method of manipulating file upload parameters during HTTP POST requests. Attackers can modify file extensions to include executable or script-based extensions such as .php, .asp, or .jsp, despite the application's apparent validation mechanisms. This unrestricted file upload capability directly maps to CWE-434, which defines the weakness of allowing untrusted data to be uploaded to a web server with executable permissions. The vulnerability's impact is amplified by the fact that it operates without proper file type validation, allowing attackers to inject malicious code directly into the web application's file system.
The operational consequences of this vulnerability are severe and multifaceted, as it provides attackers with persistent access to the target system through webshell injection capabilities. Once successfully exploited, the attacker gains the ability to execute arbitrary commands on the server, potentially leading to complete system compromise, data exfiltration, and further lateral movement within the network. The vulnerability affects organizations using OpenGnsys for network management and system administration, making it particularly dangerous for educational institutions, government agencies, and enterprises that rely on this platform for critical infrastructure management. The webshell injection capability also enables attackers to maintain persistent access, making detection and remediation more challenging.
Security mitigations for CVE-2024-3705 should focus on implementing robust input validation and file extension verification mechanisms within the affected application. Organizations should immediately implement strict file type checking that validates not only file extensions but also file content through MIME type validation and magic number checking. The recommended approach includes configuring the web server to reject executable file uploads, implementing proper file upload directories with restricted permissions, and deploying web application firewalls that can detect and block suspicious file upload patterns. Additionally, the system should enforce proper authentication and authorization controls to limit access to upload endpoints, aligning with ATT&CK technique T1505.003 for web shell deployment and T1078 for valid accounts usage. Regular security updates and patches should be applied immediately upon vendor release, while network segmentation and monitoring should be implemented to detect potential exploitation attempts.