CVE-2024-5084

Comprehensive Technical Analysis of CVE-2024-5084

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-5084

Description: The Hash Form – Drag & Drop Form Builder plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the file_upload_action function in all versions up to, and including, 1.1.0. This vulnerability allows unauthenticated attackers to upload arbitrary files on the affected site's server, potentially leading to remote code execution (RCE).

CVSS Score: 9.8

Severity Evaluation:

• Critical: The CVSS score of 9.8 indicates a critical vulnerability. The high score is due to the potential for unauthenticated attackers to execute arbitrary code on the server, which can lead to complete system compromise.
• Impact: The vulnerability can result in data breaches, unauthorized access, and potential takeover of the affected WordPress site.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated File Upload: Attackers can exploit the vulnerability by uploading malicious files without needing any authentication.
• Remote Code Execution (RCE): By uploading files such as PHP scripts, attackers can execute arbitrary code on the server.

Exploitation Methods:

• Direct Exploitation: Attackers can directly upload a malicious PHP file through the vulnerable form upload functionality.
• Chained Exploits: The vulnerability can be combined with other weaknesses to escalate privileges or perform more complex attacks.

3. Affected Systems and Software Versions

Affected Software:

• Hash Form – Drag & Drop Form Builder plugin for WordPress
• Versions: All versions up to, and including, 1.1.0

Affected Systems:

• WordPress Sites: Any WordPress site using the vulnerable versions of the Hash Form plugin.
• Server Environments: Servers hosting WordPress sites with the affected plugin installed.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Ensure that the Hash Form plugin is updated to a version that includes the patch for this vulnerability.
• Disable the Plugin: If an update is not immediately available, consider disabling the plugin until a fix is released.

Long-Term Mitigations:

• Regular Updates: Implement a regular update schedule for all plugins and themes.
• File Upload Validation: Ensure that all file upload functionalities include robust validation to prevent arbitrary file uploads.
• Web Application Firewall (WAF): Deploy a WAF to monitor and block suspicious file upload attempts.
• Access Controls: Implement strict access controls and authentication mechanisms to limit unauthorized access.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Widespread Use: Given the popularity of WordPress and the potential widespread use of the Hash Form plugin, this vulnerability poses a significant risk to a large number of websites.
• Attack Surface: The vulnerability increases the attack surface for WordPress sites, making them more susceptible to attacks.
• Reputation and Trust: Compromised websites can lead to loss of user trust and potential legal implications due to data breaches.

6. Technical Details for Security Professionals

Vulnerable Code:

• File: admin/classes/HashFormBuilder.php
• Function: file_upload_action
• Line: 764

Technical Analysis:

• Missing Validation: The file_upload_action function lacks proper file type validation, allowing any file type to be uploaded.
• Exploit Path: Attackers can craft a request to the vulnerable endpoint, bypassing any file type checks and uploading a malicious file.

Patch Details:

• Changeset: 3090341
• Fix: The patch introduces proper file type validation to ensure only permitted file types can be uploaded.

References:

• Product: HashFormBuilder.php#L764
• Patch: Changeset 3090341
• Third Party Advisory: Wordfence Threat Intel

Conclusion

CVE-2024-5084 represents a critical vulnerability in the Hash Form plugin for WordPress, allowing unauthenticated attackers to upload arbitrary files and potentially execute remote code. Immediate mitigation involves updating the plugin and implementing robust file upload validation. The broader impact underscores the need for vigilant security practices in managing WordPress sites and plugins.