EUVD-2023-34195

Comprehensive Technical Analysis of EUVD-2023-34195

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in the MStore API plugin for WordPress, identified as EUVD-2023-34195, allows for authentication bypass due to insufficient verification of the user during the cart sync process from mobile REST API requests. This flaw enables unauthenticated attackers to log in as any existing user, including administrators, if they possess the user ID.

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 base score of 9.8 indicates a critical vulnerability. The CVSS vector breakdown shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), does not need any privileges (PR:N), and does not require user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), making this a severe threat.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit this vulnerability without needing any prior authentication.
• Network Access: The attack can be conducted remotely over the network.

Exploitation Methods:

• User ID Enumeration: Attackers can enumerate user IDs through various means, such as brute-forcing or leveraging other vulnerabilities.
• REST API Exploitation: By crafting a malicious REST API request, attackers can bypass authentication and gain unauthorized access to user accounts.

3. Affected Systems and Software Versions

Affected Software:

• MStore API plugin for WordPress

Affected Versions:

• All versions up to and including 3.9.1

Vendor:

• InspireUI

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Ensure that the MStore API plugin is updated to a version higher than 3.9.1.
• Disable the Plugin: If an update is not immediately available, consider disabling the plugin until a patched version is released.

Long-Term Mitigations:

• Regular Patching: Implement a regular patching and update schedule for all plugins and software.
• Access Controls: Enforce strict access controls and monitor for unusual login attempts.
• Security Monitoring: Use security monitoring tools to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the MStore API plugin. The potential for unauthorized access to administrative accounts can lead to data breaches, financial loss, and reputational damage. Given the widespread use of WordPress and its plugins, this vulnerability underscores the importance of robust security practices and timely updates.

6. Technical Details for Security Professionals

Vulnerability Details:

• Root Cause: Insufficient verification of the user during the cart sync process from mobile REST API requests.
• Exploitation: Attackers can send a crafted REST API request to bypass authentication and log in as any user, including administrators.

Code Reference:

• The vulnerability is located in the flutter-woo.php file, specifically around line 911 in version 3.9.0.
• Changeset reference: WordPress Trac Changeset

References:

• Wordfence Threat Intelligence
• WordPress Trac Browser

Aliases:

• CVE-2023-2734
• GSD-2023-2734

Assigner:

• Wordfence

EPSS Score:

• 3 (indicating a moderate likelihood of exploitation)

ENISA IDs:

• Product: MStore API (all versions ≤3.9.1)
• Vendor: InspireUI

Conclusion

The authentication bypass vulnerability in the MStore API plugin for WordPress is a critical issue that requires immediate attention. Organizations should prioritize updating the plugin to a secure version and implement robust security measures to mitigate the risk of exploitation. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect against potential data breaches and unauthorized access.