EUVD-2025-21949

Comprehensive Technical Analysis of EUVD-2025-21949

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The "Integration for Pipedrive and Contact Form 7, WPForms, Elementor, Ninja Forms" plugin for WordPress is susceptible to PHP Object Injection. This vulnerability arises from the deserialization of untrusted input within the verify_field_val() function. The presence of a Property-Oriented Programming (POP) chain in the Contact Form 7 plugin, which is commonly used alongside, exacerbates the issue. This allows unauthenticated attackers to delete arbitrary files, potentially leading to a denial of service (DoS) or remote code execution (RCE) if critical files like wp-config.php are deleted.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high CVSS score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit the vulnerability without needing any credentials.
• Deserialization of Untrusted Input: The verify_field_val() function processes untrusted input, leading to PHP Object Injection.
• POP Chain Exploitation: The presence of a POP chain in the Contact Form 7 plugin allows attackers to perform actions such as file deletion.

Exploitation Methods:

• PHP Object Injection: Attackers can inject malicious PHP objects by manipulating the input data.
• Arbitrary File Deletion: Using the POP chain, attackers can delete critical files, leading to DoS or RCE.
• Remote Code Execution: If the wp-config.php file is deleted, attackers can potentially execute arbitrary code on the server.

3. Affected Systems and Software Versions

Affected Software:

• Plugin: Integration for Pipedrive and Contact Form 7, WPForms, Elementor, Ninja Forms
• Versions: All versions up to and including 1.2.3

Affected Systems:

• WordPress Installations: Any WordPress site using the affected plugin versions.
• Related Plugins: Contact Form 7, which is commonly used alongside the affected plugin.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Plugin: Ensure that the plugin is updated to a version higher than 1.2.3.
• Disable Plugin: If an update is not available, disable the plugin until a patched version is released.
• Monitor Logs: Closely monitor server logs for any suspicious activity related to the plugin.

Long-Term Strategies:

• Regular Updates: Implement a regular update schedule for all plugins and themes.
• Security Plugins: Use security plugins like Wordfence to monitor and protect against vulnerabilities.
• Code Review: Conduct thorough code reviews and security audits for custom plugins and themes.
• Least Privilege: Ensure that plugins and themes operate with the least privilege necessary.

5. Impact on European Cybersecurity Landscape

Impact Assessment:

• Widespread Use: The affected plugin is widely used in European WordPress installations, increasing the potential impact.
• Critical Infrastructure: Websites of critical infrastructure, businesses, and government agencies could be affected, leading to significant disruptions.
• Data Breach: The vulnerability could lead to data breaches, compromising sensitive information.

Regulatory Compliance:

• GDPR: Organizations must ensure compliance with GDPR by protecting personal data and reporting breaches promptly.
• NIS Directive: Critical infrastructure operators must adhere to the Network and Information Systems (NIS) Directive to maintain security and resilience.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: verify_field_val()
• Issue: Deserialization of untrusted input leading to PHP Object Injection.
• POP Chain: The presence of a POP chain in the Contact Form 7 plugin allows for arbitrary file deletion.

Exploitation Steps:

1. Identify Vulnerable Plugin: Confirm the presence of the vulnerable plugin version.
2. Craft Malicious Input: Create a payload that exploits the deserialization vulnerability.
3. Execute Payload: Send the payload to the vulnerable endpoint.
4. Leverage POP Chain: Use the POP chain to delete critical files like wp-config.php.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities related to the plugin.
• Web Application Firewalls (WAF): Use WAF to block malicious requests targeting the vulnerability.
• Incident Response Plan: Develop and implement an incident response plan to quickly address any detected exploitation attempts.

Conclusion: The vulnerability in the "Integration for Pipedrive and Contact Form 7, WPForms, Elementor, Ninja Forms" plugin poses a significant risk to WordPress installations. Immediate mitigation strategies, including updating the plugin and monitoring for suspicious activity, are crucial. Long-term strategies should focus on regular updates, security audits, and adherence to regulatory compliance to protect against similar vulnerabilities in the future.