EUVD-2024-38374

Comprehensive Technical Analysis of EUVD-2024-38374

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38374, also known as CVE-2024-39280, is an external config control vulnerability in the nas.cgi set_smb_cfg() functionality of the Wavlink AC3000 M33A8.V5030.210505 firmware. This vulnerability allows an attacker to execute arbitrary commands through a specially crafted HTTP request. The CVSS Base Score of 9.1 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): High (H) - The attacker needs high-level privileges to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Changed (C) - The vulnerability affects resources beyond the security scope managed by the security authority.
• Confidentiality (C): High (H) - There is a high impact on confidentiality.
• Integrity (I): High (H) - There is a high impact on integrity.
• Availability (A): High (H) - There is a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is an authenticated HTTP request. An attacker with valid credentials can craft a malicious HTTP request targeting the set_smb_cfg() function within the nas.cgi script. This request can lead to arbitrary command execution, allowing the attacker to:

• Execute Malicious Commands: Run arbitrary commands on the device.
• Gain Unauthorized Access: Escalate privileges and gain unauthorized access to sensitive data.
• Install Malware: Deploy malware or backdoors for persistent access.
• Disrupt Services: Cause denial of service (DoS) by disrupting network services.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Wavlink AC3000 router with firmware version M33A8.V5030.210505. Other versions of the Wavlink AC3000 firmware may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their devices to determine if they are at risk.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Apply the latest firmware updates provided by Wavlink. Ensure that the firmware version is higher than M33A8.V5030.210505.
• Access Control: Implement strict access controls to limit who can authenticate to the device. Use strong, unique passwords and multi-factor authentication (MFA) where possible.
• Network Segmentation: Segment the network to isolate critical systems and reduce the attack surface.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect and respond to suspicious activities.
• Firewall Configuration: Configure firewalls to restrict access to the management interface of the device.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Wavlink AC3000 routers. Given the critical nature of the vulnerability, it could be exploited to compromise network security, leading to data breaches, service disruptions, and potential financial losses. The European Union Agency for Cybersecurity (ENISA) should issue advisories and guidelines to raise awareness and promote best practices for mitigation.

6. Technical Details for Security Professionals

• Vulnerability Type: Command Injection
• Affected Component: nas.cgi script, specifically the set_smb_cfg() function.
• Exploitation: The vulnerability can be exploited by sending a specially crafted HTTP request to the nas.cgi script. The request must be authenticated, indicating that the attacker needs valid credentials.
• Detection: Security professionals can detect exploitation attempts by monitoring network traffic for unusual HTTP requests targeting the nas.cgi script. Intrusion detection systems (IDS) and intrusion prevention systems (IPS) should be configured to alert on such activities.
• Response: In case of a detected exploitation attempt, immediate actions should include isolating the affected device, revoking compromised credentials, and applying the latest firmware updates.

Conclusion

EUVD-2024-38374 is a critical vulnerability that requires immediate attention from cybersecurity professionals. By understanding the technical details and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.

References

• Talos Intelligence Vulnerability Report
• ENISA ID Product: 3edd25e0-406a-3837-86f4-b3422bab3fda
• ENISA ID Vendor: 93debf89-f96f-3d8a-b17e-9bfaa040db7b