EUVD-2024-38376

Comprehensive Technical Analysis of EUVD-2024-38376

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38376, also known as CVE-2024-39784, affects the Wavlink AC3000 M33A8.V5030.210505 device. The vulnerability involves multiple command execution flaws in the nas.cgi add_dir() functionality and a command injection vulnerability in the disk_part POST parameter. 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 can be exploited over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill and 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 a component that is outside the security scope of the vulnerable component.
• Confidentiality (C): High (H) - The vulnerability allows for complete compromise of confidentiality.
• Integrity (I): High (H) - The vulnerability allows for complete compromise of integrity.
• Availability (A): High (H) - The vulnerability allows for complete compromise of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending a specially crafted HTTP request to the nas.cgi endpoint. An attacker with authenticated access can exploit the vulnerability by:

• Command Execution: Crafting an HTTP request that includes malicious commands in the add_dir() functionality.
• Command Injection: Injecting malicious commands through the disk_part POST parameter.

Exploitation methods may include:

• Remote Code Execution (RCE): Executing arbitrary commands on the device, leading to full system compromise.
• Data Exfiltration: Extracting sensitive information from the device.
• Denial of Service (DoS): Disrupting the normal operation of the device.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Product: Wavlink AC3000
• Version: M33A8.V5030.210505

Other versions of the Wavlink AC3000 may also be affected, but this has not been confirmed.

4. Recommended Mitigation Strategies

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

• Patch Management: Apply the latest firmware updates provided by Wavlink. Ensure that all devices are running the most recent, secure version.
• Access Control: Implement strict access controls to limit authenticated access to the device. Use strong, unique passwords and multi-factor authentication (MFA) where possible.
• Network Segmentation: Segregate the device from critical networks to limit the potential impact of an exploit.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect any suspicious activity. Use intrusion detection systems (IDS) and intrusion prevention systems (IPS) to identify and block malicious traffic.
• User Education: Educate users on the importance of secure practices and the risks associated with unauthorized access.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Wavlink AC3000 devices. The potential for remote command execution and data exfiltration can lead to:

• Data Breaches: Compromise of sensitive information, including personal data protected under GDPR.
• Operational Disruption: Denial of service attacks can disrupt critical operations, leading to financial and operational losses.
• Reputation Damage: Organizations may suffer reputational damage if they are found to be vulnerable to such attacks.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Vulnerable Endpoint: The nas.cgi endpoint, specifically the add_dir() function and the disk_part POST parameter.
• Exploit Detection: Monitor for unusual HTTP requests to the nas.cgi endpoint. Look for patterns indicative of command injection or execution attempts.
• Incident Response: In case of an incident, isolate the affected device immediately. Conduct a thorough investigation to determine the extent of the compromise and take appropriate remediation steps.
• Forensic Analysis: Perform forensic analysis on the device to identify any malicious commands executed and assess the impact.

Conclusion

EUVD-2024-38376 is a critical vulnerability affecting the Wavlink AC3000 M33A8.V5030.210505 device. Organizations must prioritize patching and implementing robust security measures to mitigate the risk. Continuous monitoring and incident response preparedness are essential to protect against potential exploits.

For further details, refer to the Talos Intelligence report: TALOS-2024-2058.