CVE-2025-2031 in ChestnutCMS
Summary
by MITRE • 03/06/2025
A vulnerability classified as critical has been found in ChestnutCMS up to 1.5.2. This affects the function uploadFile of the file /dev-api/cms/file/upload. The manipulation of the argument file leads to unrestricted upload. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 05/13/2025
The vulnerability identified as CVE-2025-2031 represents a critical security flaw in ChestnutCMS versions 1.5.2 and earlier, specifically within the file upload functionality of the /dev-api/cms/file/upload endpoint. This issue stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file types and content, creating a dangerous pathway for malicious actors to bypass security controls. The vulnerability is particularly concerning because it affects a core content management function that is essential for website administrators to manage media assets and other file uploads. The flaw exists in the uploadFile function where the file argument is processed without sufficient validation, allowing attackers to upload arbitrary files to the server. This unrestricted upload capability enables adversaries to execute malicious code, potentially leading to complete system compromise. The vulnerability's critical classification indicates that it can be exploited remotely without requiring authentication, making it highly attractive to threat actors seeking to compromise web applications. According to CWE standards, this vulnerability maps to CWE-434 which describes "Unrestricted Upload of File with Dangerous Type," a well-documented weakness that has been consistently exploited in web application attacks. The ATT&CK framework categorizes this as part of the T1190 technique for Exploit Public-Facing Application, where adversaries target vulnerabilities in externally accessible web applications to establish initial access. The public disclosure of the exploit means that malicious actors can readily leverage this vulnerability without requiring advanced technical skills or custom exploit development, significantly increasing the risk to affected systems.
The technical implementation of this vulnerability allows attackers to upload files with potentially malicious content such as web shells, malware, or other harmful executables directly to the web server. When the uploadFile function processes the file argument, it fails to validate file extensions, MIME types, or content signatures, creating a pathway for attackers to bypass normal security controls. The vulnerability operates by accepting any file type without proper validation, enabling the upload of executable scripts or binary files that can be executed on the server. This flaw can be exploited through simple HTTP requests that manipulate the file parameter, making it extremely easy to target. The unrestricted nature of the upload means that attackers can potentially upload files that will be executed by the web server, leading to remote code execution capabilities. The vulnerability's impact is amplified by the fact that it affects a publicly accessible API endpoint, meaning that any internet-connected system running the vulnerable version of ChestnutCMS is at risk. The lack of proper file type restrictions combined with insufficient content validation creates a perfect storm for exploitation, as attackers can upload files that are designed to execute malicious code when accessed by the web server.
The operational impact of this vulnerability extends far beyond simple data theft or service disruption, as it can lead to complete system compromise and persistent access for attackers. Once an attacker successfully exploits this vulnerability, they can establish a foothold within the affected system that allows for further reconnaissance, privilege escalation, and lateral movement throughout the network. The uploaded malicious files can serve as backdoors, enabling attackers to maintain persistent access even after the initial exploit is patched. The vulnerability also creates opportunities for attackers to use the compromised system as a launching point for attacks on other systems within the network infrastructure. Organizations running affected versions of ChestnutCMS face significant risks including data breaches, system infiltration, and potential regulatory compliance violations. The public availability of the exploit means that automated scanning tools can quickly identify vulnerable systems, making the window of opportunity for exploitation much larger. This vulnerability can also impact business continuity by causing service outages, data loss, and requiring extensive remediation efforts that may include complete system reinstallation. The financial impact extends beyond immediate remediation costs to include potential regulatory fines, legal liabilities, and reputational damage that organizations may face following a successful exploitation of this vulnerability.
Mitigation strategies for CVE-2025-2031 must be implemented immediately to protect affected systems from exploitation. The most critical action is to upgrade to a patched version of ChestnutCMS that addresses the unrestricted file upload vulnerability in the uploadFile function. Organizations should also implement immediate network-level controls such as restricting access to the vulnerable API endpoints through firewalls and access control lists. Input validation and sanitization should be strengthened by implementing strict file type checking, MIME type validation, and content signature verification before any file processing occurs. The implementation of proper file upload restrictions including whitelisting allowed file extensions and enforcing proper file naming conventions can significantly reduce the attack surface. Organizations should also consider implementing web application firewalls and intrusion detection systems that can identify and block suspicious file upload attempts. Regular security audits and penetration testing should be conducted to ensure that no other similar vulnerabilities exist within the application. Additionally, implementing proper logging and monitoring of file upload activities can help detect suspicious behavior and provide forensic evidence in case of successful exploitation attempts. The security controls should also include regular security updates and patch management processes to ensure that similar vulnerabilities are identified and addressed before they can be exploited by malicious actors.