EUVD-2024-33487

Comprehensive Technical Analysis of EUVD-2024-33487

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in the Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce plugin (EUVD-2024-33487) is classified as a critical issue due to its high base score of 9.8 under the CVSS v3.1 framework. The vulnerability allows unauthorized arbitrary plugin installation and activation due to a missing capability check on the tp_install() function. This flaw can be exploited by unauthenticated attackers to install and activate arbitrary plugins, potentially leading to remote code execution (RCE) if another vulnerable plugin is installed and activated.

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
• Impact Metrics:
  • Confidentiality (C): High
  • Integrity (I): High
  • Availability (A): High

The high impact metrics indicate that this vulnerability can lead to significant data breaches, unauthorized modifications, and service disruptions.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit this vulnerability without needing any authentication, making it highly accessible.
• Arbitrary Plugin Installation: The lack of capability checks allows attackers to install any plugin, including malicious ones.
• Remote Code Execution (RCE): If a vulnerable plugin is installed, attackers can execute arbitrary code on the server.

Exploitation Methods:

• Direct Exploitation: Attackers can send crafted HTTP requests to the vulnerable endpoint to trigger the tp_install() function and install malicious plugins.
• Chained Exploits: By installing a known vulnerable plugin, attackers can chain this vulnerability with other exploits to achieve RCE.

3. Affected Systems and Software Versions

Affected Software:

• Vayu Blocks – Gutenberg Blocks for WordPress & WooCommerce
• Versions: All versions up to and including 1.1.1

Affected Systems:

• WordPress Websites: Any WordPress site using the affected versions of the Vayu Blocks plugin.
• WooCommerce Integrations: Websites using WooCommerce in conjunction with the Vayu Blocks plugin.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Ensure that the Vayu Blocks plugin is updated to version 1.2.0 or later, which includes the partial patch for this vulnerability.
• Disable the Plugin: If an update is not immediately possible, disable the plugin to prevent exploitation.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits of all installed plugins and themes.
• Access Controls: Implement strict access controls and capability checks for all administrative functions.
• Monitoring: Use security plugins like Wordfence to monitor for suspicious activities and unauthorized plugin installations.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress and WooCommerce. Given the widespread use of these platforms, the potential for large-scale attacks is high. This underscores the need for robust security practices and timely updates to mitigate such risks.

6. Technical Details for Security Professionals

Vulnerable Function:

• Function Name: tp_install()
• Location: inc/vayu-sites/core/class-installation.php#L29

Code Analysis:

• The tp_install() function lacks proper capability checks, allowing unauthenticated users to trigger plugin installations.
• The vulnerability was partially patched in version 1.1.1, but a complete fix is available in version 1.2.0.

References:

• Wordfence Threat Intelligence: Wordfence Vulnerability Report
• WordPress Trac:
  • Class Installation Code
  • App.php Code
  • Changeset 3173408
  • Changeset 3203532

Assigner:

• Wordfence

EPSS Score:

• EPSS: 43 (indicating a moderate likelihood of exploitation)

ENISA IDs:

• Product ID: cd669f31-6ce6-39f5-bc10-b36e480d0271
• Vendor ID: 197b139d-154a-35de-ba49-e6a6c793daa0

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