EUVD-2023-59035

Comprehensive Technical Analysis of EUVD-2023-59035

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-59035 affects the File Manager and File Manager Pro plugins for WordPress. It is classified as a Directory Traversal vulnerability, which allows attackers to read the contents of arbitrary files on the server and upload files into unintended directories. This vulnerability is present in versions up to and including 7.2.1 (free version) and 8.3.4 (Pro version).

Severity Evaluation:

• Base Score: 9.9 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

The high base score indicates that this vulnerability is critical. The CVSS vector breakdown shows that the attack vector is network-based (AV:N), the attack complexity is low (AC:L), and the required privileges are low (PR:L). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), and the scope is changed (S:C), meaning the vulnerability can affect components beyond the security scope managed by the security authority.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Directory Traversal: Attackers can manipulate the target parameter in the mk_file_folder_manager_action_callback_shortcode function to traverse directories and access sensitive files.
• File Upload: Attackers can upload files to unintended directories, potentially leading to further exploitation such as remote code execution.

Exploitation Methods:

• Reading Sensitive Files: By exploiting the directory traversal vulnerability, attackers can read configuration files, database credentials, and other sensitive information.
• Uploading Malicious Files: Attackers can upload malicious scripts or files to critical directories, which can be executed to gain further control over the server.

3. Affected Systems and Software Versions

Affected Systems:

• WordPress websites using the File Manager plugin (free version) up to and including version 7.2.1.
• WordPress websites using the File Manager Pro plugin up to and including version 8.3.4.

Software Versions:

• File Manager (free version) ≤ 7.2.1
• File Manager Pro ≤ 8.3.4

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Plugins: Ensure that the File Manager and File Manager Pro plugins are updated to the latest versions that address this vulnerability.
• Access Control: Restrict administrative access to the WordPress dashboard and ensure that only trusted users have file handling privileges.
• Monitoring: Implement monitoring and logging to detect any unusual file access or upload activities.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments of all plugins and themes used on WordPress sites.
• Least Privilege: Apply the principle of least privilege to user roles and permissions.
• Backup and Recovery: Maintain regular backups and have a recovery plan in place to restore the site in case of a breach.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress for their websites. Given the widespread use of WordPress and the critical nature of the vulnerability, it could lead to data breaches, unauthorized access, and potential loss of sensitive information. The high EPSS score of 6 indicates a moderate likelihood of exploitation in the wild.

6. Technical Details for Security Professionals

Vulnerable Function:

• mk_file_folder_manager_action_callback_shortcode

Vulnerable Parameter:

• target

Exploitation Steps:

1. Identify the Vulnerable Endpoint: Locate the endpoint that processes the mk_file_folder_manager_action_callback_shortcode function.
2. Craft Malicious Input: Create a payload that manipulates the target parameter to traverse directories and access or upload files.
3. Execute the Attack: Send the crafted payload to the vulnerable endpoint and observe the server's response.

Detection and Response:

• Log Analysis: Analyze server logs for unusual file access patterns or unauthorized file uploads.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities related to directory traversal and file uploads.
• Patch Management: Ensure that all WordPress plugins and themes are regularly updated to the latest versions.

References:

• Wordfence Threat Intelligence
• GitHub elFinder Volume Driver
• WordPress Plugin Changeset

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and protect their digital assets.