EUVD-2024-38384

Comprehensive Technical Analysis of EUVD-2024-38384

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-38384 pertains to multiple external configuration control vulnerabilities in the nas.cgi set_nas() functionality of the ProFTPD service running on the Wavlink AC3000 M33A8.V5030.210505 device. The base score of 9.1, as per CVSS 3.1, indicates a critical severity level. The 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 remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): High (H) - The attacker needs to be authenticated.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• Scope (S): Changed (C) - The vulnerability affects a component that is outside the security scope of the vulnerable component.
• Confidentiality (C): High (H) - There is a high impact on the confidentiality of the system.
• Integrity (I): High (H) - There is a high impact on the integrity of the system.
• Availability (A): High (H) - There is a high impact on the availability of the system.

Given these metrics, the vulnerability is highly critical and poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending a specially crafted HTTP request to the nas.cgi endpoint, specifically targeting the set_nas() function. The vulnerability allows for permission bypass and configuration injection via the ftp_port POST parameter. An attacker with authenticated access can exploit this vulnerability to:

• Bypass Permissions: Gain unauthorized access to restricted functionalities.
• Inject Malicious Configurations: Alter the FTP port settings to disrupt services or redirect traffic.
• Compromise System Integrity: Modify configurations to introduce backdoors or other malicious settings.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Device: Wavlink AC3000
• Firmware Version: M33A8.V5030.210505

Users of this specific device and firmware version are at risk and should take immediate action to mitigate the vulnerability.

4. Recommended Mitigation Strategies

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

• Update Firmware: Ensure that the Wavlink AC3000 device is updated to the latest firmware version that addresses this vulnerability.
• Access Control: Implement strict access controls to limit authenticated access to the device.
• Network Segmentation: Segregate the device from critical networks to minimize the potential impact of an attack.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect and respond to any suspicious activities.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on any attempts to exploit this vulnerability.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations and individuals using the Wavlink AC3000 device. The potential for unauthorized access and configuration manipulation can lead to data breaches, service disruptions, and other security incidents. Organizations should prioritize patching and securing affected devices to prevent potential exploitation.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Endpoint: nas.cgi
• Vulnerable Function: set_nas()
• Vulnerable Parameter: ftp_port
• Exploitation Method: Crafted HTTP POST request with malicious ftp_port value.
• Detection: Monitor for unusual HTTP requests to the nas.cgi endpoint, particularly those with unexpected ftp_port values.
• Response: Implement automated response mechanisms to block or alert on suspicious activities targeting the nas.cgi endpoint.

Conclusion

EUVD-2024-38384 represents a critical vulnerability in the Wavlink AC3000 device that requires immediate attention. Organizations should prioritize updating affected devices and implementing robust security measures to mitigate the risk. Continuous monitoring and vigilance are essential to protect against potential exploitation and ensure the integrity and security of networked systems.