EUVD-2024-38361

Comprehensive Technical Analysis of EUVD-2024-38361

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38361, also known as CVE-2024-39782, pertains to multiple OS command injection vulnerabilities in the adm.cgi sch_reboot() functionality of the Wavlink AC3000 M33A8.V5030.210505. 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 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 a different 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.

This high severity score underscores the critical nature of the vulnerability, which can lead to arbitrary code execution.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending a specially crafted HTTP request to the adm.cgi script, specifically targeting the sch_reboot() functionality. The restart_min POST parameter is vulnerable to command injection, allowing an attacker to execute arbitrary commands on the affected device.

Exploitation Methods:

• Authenticated HTTP Request: An attacker with valid credentials can send a malicious HTTP request to the adm.cgi script, injecting OS commands through the restart_min parameter.
• Command Injection: By manipulating the restart_min parameter, an attacker can inject and execute arbitrary OS commands, potentially leading to full system compromise.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Wavlink AC3000 router with firmware version M33A8.V5030.210505. It is crucial to note that other versions of the Wavlink AC3000 or similar devices may also be affected if they share the same codebase or functionality.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Ensure that the Wavlink AC3000 firmware is updated to the latest version that addresses this vulnerability.
• Access Control: Restrict access to the adm.cgi script to trusted IP addresses and ensure strong authentication mechanisms are in place.
• Network Segmentation: Isolate the affected device from critical network segments to limit the potential impact of an exploit.

Long-Term Mitigation:

• Regular Patching: Implement a regular patching and update schedule for all network devices.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity and potential exploitation attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the Wavlink AC3000 router. Given the critical nature of the vulnerability, successful exploitation could lead to data breaches, unauthorized access, and disruption of services. This underscores the importance of robust cybersecurity measures and the need for timely updates and patches from vendors.

6. Technical Details for Security Professionals

Vulnerability Details:

• Affected Component: adm.cgi script, specifically the sch_reboot() function.
• Vulnerable Parameter: restart_min POST parameter.
• Exploit Mechanism: Command injection through crafted HTTP requests.

Detection and Response:

• Log Analysis: Monitor logs for unusual activity related to the adm.cgi script and the sch_reboot() function.
• Intrusion Detection: Implement rules to detect and alert on suspicious HTTP requests targeting the adm.cgi script.
• Incident Response: Develop an incident response plan that includes steps for isolating affected devices, containing the threat, and restoring normal operations.

References:

• Talos Intelligence Report: TALOS-2024-2033

In conclusion, the EUVD-2024-38361 vulnerability represents a critical risk to the Wavlink AC3000 router. Immediate and long-term mitigation strategies are essential to protect against potential exploitation and ensure the security of affected systems.