EUVD-2024-49733

Comprehensive Technical Analysis of EUVD-2024-49733

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in the Wechat Social login plugin for WordPress, identified as EUVD-2024-49733 (CVE-2024-9106), is classified as an authentication bypass issue. This vulnerability allows unauthenticated attackers to log in as any existing user on the site, including administrators, if they have access to the user ID. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, which is considered critical.

CVSS Base Score Vector Breakdown:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill and resources.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves exploiting the insufficient verification of the user being supplied during the social login process. An attacker can:

1. Identify the user ID of an existing user, such as an administrator.
2. Craft a login request using the identified user ID.
3. Bypass the authentication mechanism due to the lack of proper verification.

This can be achieved through:

• Network Sniffing: Capturing user IDs from network traffic.
• Brute Force: Guessing user IDs, especially if they follow a predictable pattern.
• Social Engineering: Tricking users into revealing their user IDs.

3. Affected Systems and Software Versions

The vulnerability affects the Wechat Social login plugin for WordPress in versions up to and including 1.3.0. Specifically, it impacts the plugin developed by xunhuweb, known as "Wechat Social login 微信QQ钉钉登录插件."

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps are recommended:

1. Update the Plugin: Ensure that the Wechat Social login plugin is updated to a version higher than 1.3.0, where the vulnerability has been addressed.
2. Set App Secret: Ensure that the app secret is set and not left with a default empty value.
3. Monitor Logs: Regularly monitor login attempts and access logs for any suspicious activity.
4. Implement Multi-Factor Authentication (MFA): Add an additional layer of security to the login process.
5. Regular Security Audits: Conduct regular security audits and vulnerability assessments on all plugins and software components.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using WordPress with the affected plugin. The potential for unauthorized access to sensitive information and administrative controls can lead to data breaches, financial loss, and reputational damage. Given the widespread use of WordPress and social login plugins, the impact could be extensive if not addressed promptly.

6. Technical Details for Security Professionals

Vulnerability Details:

• Plugin Name: Wechat Social login 微信QQ钉钉登录插件
• Affected Versions: ≤1.3.0
• Vulnerable Component: Social login process
• Condition for Exploitation: App secret is not set (default empty value)

Exploitation Steps:

1. Identify the user ID of the target user.
2. Craft a login request with the identified user ID.
3. Submit the request to the vulnerable plugin, bypassing the authentication mechanism.

Code Reference: The vulnerability is located in the file class-xh-social-channel-qq.php at line 284. The insufficient verification of the user ID during the social login process allows for the authentication bypass.

References:

• Wordfence Threat Intelligence
• WordPress Plugin Repository

Conclusion: The authentication bypass vulnerability in the Wechat Social login plugin for WordPress is critical and requires immediate attention. Organizations should prioritize updating the plugin and implementing additional security measures to mitigate the risk. Regular monitoring and security audits are essential to maintain a robust cybersecurity posture.