EUVD-2025-21413

Comprehensive Technical Analysis of EUVD-2025-21413

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-21413 affects the HT Contact Form Widget For Elementor Page Builder & Gutenberg Blocks & Form Builder plugin for WordPress. The issue arises from insufficient file path validation in the handle_files_upload() function, which allows unauthenticated attackers to move arbitrary files on the server. This can lead to remote code execution (RCE) if critical files like wp-config.php are moved.

Severity Evaluation:

• CVSS Base Score: 9.1
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

The high base score of 9.1 indicates a critical vulnerability. The CVSS vector shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), does not need user interaction (UI:N), and has a high impact on integrity (I:H) and availability (A:H). The scope is unchanged (S:U), and there is no impact on confidentiality (C:N).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit this vulnerability without needing any authentication.
• Arbitrary File Moving: By manipulating the file path in the handle_files_upload() function, attackers can move files to different locations on the server.

Exploitation Methods:

• Remote Code Execution (RCE): Moving critical files like wp-config.php can lead to RCE, allowing attackers to execute arbitrary code on the server.
• Data Manipulation: Attackers can move configuration files or other critical files to disrupt the normal functioning of the website.

3. Affected Systems and Software Versions

Affected Software:

• HT Contact Form Widget For Elementor Page Builder & Gutenberg Blocks & Form Builder plugin for WordPress

Affected Versions:

• All versions up to and including 2.2.1

Vendor:

• htplugins

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Ensure that the plugin is updated to a version higher than 2.2.1, where the vulnerability has been patched.
• Disable the Plugin: If an update is not immediately available, consider disabling the plugin until a secure version is released.

Long-Term Mitigation:

• Regular Updates: Implement a regular update schedule for all plugins and themes to ensure they are running the latest, most secure versions.
• Code Review: Conduct thorough code reviews for plugins and themes to identify and mitigate similar vulnerabilities.
• Access Controls: Implement strict access controls and monitoring to detect and respond to unauthorized access attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress with the affected plugin. Given the widespread use of WordPress, this vulnerability could be exploited to compromise numerous websites, leading to data breaches, service disruptions, and potential financial losses.

Regulatory Compliance:

• Organizations must ensure compliance with GDPR and other relevant regulations by promptly addressing the vulnerability to protect user data.

6. Technical Details for Security Professionals

Vulnerable Function:

• handle_files_upload() in the HT Contact Form Widget plugin.

Technical Analysis:

• The vulnerability stems from insufficient validation of file paths during the file upload process. Attackers can exploit this by crafting malicious file paths that allow them to move files to arbitrary locations on the server.
• Moving critical files like wp-config.php can lead to RCE, as attackers can manipulate the configuration to execute arbitrary code.

Detection and Monitoring:

• Log Analysis: Monitor server logs for unusual file movement activities, especially those involving critical files.
• Intrusion Detection Systems (IDS): Implement IDS to detect and alert on suspicious file movement patterns.

Patch Analysis:

• Review the changeset provided in the references to understand the specific fixes applied to the handle_files_upload() function. Ensure that the patch adequately addresses the file path validation issue.

References:

• Wordfence Threat Intel
• WordPress Plugin Page
• WordPress Trac Changeset

By following these recommendations and maintaining vigilant monitoring, organizations can mitigate the risks associated with this vulnerability and enhance their overall cybersecurity posture.