EUVD-2025-3536

Comprehensive Technical Analysis of EUVD-2025-3536

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified as EUVD-2025-3536 pertains to an "Unrestricted Upload of File with Dangerous Type" in the "Multi Uploader for Gravity Forms" plugin. This vulnerability allows an attacker to upload a web shell to a web server, potentially leading to full server compromise. The CVSS (Common Vulnerability Scoring System) base score of 9.0 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): High (H) - The attack requires specific conditions or knowledge.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves uploading a malicious file, such as a web shell, through the "Multi Uploader for Gravity Forms" plugin. An attacker could exploit this vulnerability by:

• Crafting a Malicious File: Creating a web shell or other malicious script.
• Uploading the File: Using the plugin's file upload functionality to upload the malicious file.
• Executing the Web Shell: Once uploaded, the attacker can execute the web shell to gain unauthorized access to the server.

3. Affected Systems and Software Versions

The vulnerability affects the "Multi Uploader for Gravity Forms" plugin versions from n/a through 1.1.3. This plugin is used in conjunction with Gravity Forms, a popular WordPress form builder. Any WordPress site using this plugin within the affected version range is at risk.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps should be taken:

• Update the Plugin: Ensure that the "Multi Uploader for Gravity Forms" plugin is updated to a version that addresses this vulnerability.
• Implement File Upload Restrictions: Configure the server to restrict the types of files that can be uploaded.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.
• Web Application Firewalls (WAF): Deploy WAFs to monitor and block suspicious file uploads.
• User Education: Educate users on the risks of uploading files from untrusted sources.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of WordPress and Gravity Forms. Unpatched systems could be exploited to compromise web servers, leading to data breaches, unauthorized access, and potential financial losses. Organizations and individuals in Europe must prioritize updating their plugins and implementing robust security measures to protect against such vulnerabilities.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Detection: Implement intrusion detection systems (IDS) to monitor for suspicious file upload activities.
• Logging and Monitoring: Ensure comprehensive logging and monitoring of file upload activities to detect and respond to potential exploits.
• Incident Response: Develop an incident response plan that includes steps for identifying, containing, and remediating compromised systems.
• Patch Management: Establish a robust patch management process to ensure timely updates of all plugins and software.
• Security Configuration: Review and harden the security configuration of web servers and applications to minimize the risk of exploitation.

By addressing these points, organizations can significantly reduce the risk posed by this vulnerability and enhance their overall cybersecurity posture.

References

• Patchstack Vulnerability Database

Conclusion

The "Unrestricted Upload of File with Dangerous Type" vulnerability in the "Multi Uploader for Gravity Forms" plugin is a critical issue that requires immediate attention. By understanding the attack vectors, affected systems, and recommended mitigation strategies, cybersecurity professionals can effectively protect against this vulnerability and maintain the integrity of their web applications.