EUVD-2024-38360

Comprehensive Technical Analysis of EUVD-2024-38360

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38360, also known as CVE-2024-39781, pertains to multiple OS command injection vulnerabilities in the adm.cgi sch_reboot() functionality of the Wavlink AC3000 M33A8.V5030.210505. The vulnerability allows an attacker to execute arbitrary code by sending a specially crafted HTTP request. The command injection vulnerability specifically exists in the restart_hour POST parameter.

Severity Evaluation:

• CVSS Base Score: 9.1
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

The high base score of 9.1 indicates a critical vulnerability. The CVSS vector breakdown is as follows:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): High (H)
• User Interaction (UI): None (N)
• Scope (S): Changed (C)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This vulnerability is severe due to its potential for arbitrary code execution, which can lead to complete system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated HTTP Request: An attacker needs to be authenticated to exploit this vulnerability. This could be achieved through credential theft, brute-forcing, or exploiting other vulnerabilities that allow unauthorized access.
• Command Injection: The attacker can inject malicious commands through the restart_hour POST parameter in the adm.cgi script.

Exploitation Methods:

• Crafted HTTP Request: An attacker can send a specially crafted HTTP request to the vulnerable endpoint, injecting OS commands that will be executed by the system.
• Automated Tools: Attackers may use automated tools to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

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

Vendor:

• Name: WAVLINK

All devices running the specified firmware version are vulnerable to this attack.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Apply the latest firmware updates provided by WAVLINK as soon as they are available.
• Access Control: Ensure that only authorized users have access to the device's management interface.
• Network Segmentation: Isolate the device on a separate network segment to limit the attack surface.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Monitoring: Implement continuous monitoring to detect and respond to suspicious activities.
• User Education: Educate users on the importance of strong passwords and the risks of phishing attacks.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Wavlink devices. Given the critical nature of the vulnerability, it could be exploited to gain unauthorized access, steal sensitive information, and disrupt network operations. This underscores the importance of timely patching and robust cybersecurity practices.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Component: adm.cgi script, specifically the sch_reboot() function.
• Vulnerable Parameter: restart_hour POST parameter.
• Exploitation: The vulnerability can be exploited by injecting OS commands into the restart_hour parameter, leading to arbitrary code execution.

Detection and Response:

• Log Analysis: Monitor logs for unusual HTTP requests to the adm.cgi endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities related to command injection.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• Talos Intelligence Report: TALOS-2024-2033

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.