CVE-2025-40678 in Portal del Empleado
Summary
by MITRE • 09/18/2025
Unrestricted upload vulnerability for dangerous file types on Summar Software´s Portal del Empleado. This vulnerability allows an attacker to upload a dangerous file type by sending a POST request using the parameter “cctl00$ContentPlaceHolder1$fuAdjunto” in “/MemberPages/ntf_absentismo.aspx”.
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Analysis
by VulDB Data Team • 09/18/2025
The vulnerability identified as CVE-2025-40678 represents a critical security flaw within Summar Software's Portal del Empleado application that enables unauthorized file upload capabilities. This unrestricted file upload vulnerability specifically targets the employee portal's attachment handling mechanism, creating a pathway for malicious actors to bypass normal security controls and potentially execute arbitrary code on the affected system. The vulnerability manifests through a POST request method that utilizes the parameter "cctl00$ContentPlaceHolder1$fuAdjunto" within the "/MemberPages/ntf_absentismo.aspx" endpoint, which is designed for managing employee absence notifications and related documentation.
The technical implementation of this vulnerability stems from inadequate input validation and file type restriction mechanisms within the web application's upload functionality. When an attacker submits a malicious file through the designated upload parameter, the application fails to properly validate the file extension, content type, or file structure against a comprehensive whitelist of allowed file types. This absence of proper sanitization creates an environment where attackers can upload potentially dangerous file formats such as executable files, script files, or web shells that could compromise the entire system. The vulnerability aligns with CWE-434 which specifically addresses "Unrestricted Upload of File with Dangerous Type" and represents a common weakness in web application security frameworks where file upload controls are not adequately protected against malicious inputs.
The operational impact of this vulnerability extends beyond simple unauthorized file placement, as it provides attackers with a potential foothold for more sophisticated attacks within the organization's network infrastructure. Once a malicious file is successfully uploaded, it could be executed directly through the web application or accessed through subsequent system interactions, potentially leading to complete system compromise. Attackers might leverage this vulnerability to establish persistent backdoors, escalate privileges, or use the compromised system as a launching point for lateral movement throughout the network. The attack surface is particularly concerning given that this vulnerability affects an employee portal, which typically contains sensitive personal and organizational data, making it a valuable target for both external attackers and insider threats. This vulnerability directly maps to several ATT&CK techniques including T1190 for Exploit Public-Facing Application, T1059 for Command and Scripting Interpreter, and T1078 for Valid Accounts, as the attacker could potentially use compromised credentials to maintain access to the system.
Mitigation strategies for CVE-2025-40678 must address both immediate remediation and long-term security improvements within the application's architecture. Organizations should implement strict file type validation using a positive whitelist approach that only permits known safe file extensions such as jpg, png, pdf, and docx while rejecting all others. The application must enforce content type checking in addition to extension validation to prevent attackers from manipulating headers to bypass restrictions. Implementing proper file storage mechanisms that separate uploaded files from the web root, using random file names, and applying appropriate file permissions can significantly reduce the attack surface. Additionally, the system should incorporate automated virus scanning of all uploaded files, implement proper access controls for uploaded content, and establish comprehensive logging and monitoring capabilities to detect suspicious upload activities. Regular security assessments and penetration testing should be conducted to verify the effectiveness of implemented controls, while application security training for developers should emphasize secure file upload implementation practices to prevent similar vulnerabilities in future development cycles.