EUVD-2024-38390

Comprehensive Technical Analysis of EUVD-2024-38390

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38390, also known as CVE-2024-39367, is an OS command injection vulnerability affecting the firewall.cgi component of the Wavlink AC3000 router, specifically in the iptablesWebsFilterRun() functionality. This vulnerability allows an attacker to execute arbitrary code by sending a specially crafted HTTP request. The CVSS (Common Vulnerability Scoring System) base score of 9.1 indicates a critical severity level.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low complexity to execute.
• PR:H (High Privileges Required): The attacker needs high privileges (authenticated access) to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:C (Changed Scope): The vulnerability can affect resources beyond the security scope managed by the security authority.
• C:H (High Confidentiality Impact): The vulnerability can lead to a high impact on confidentiality.
• I:H (High Integrity Impact): The vulnerability can lead to a high impact on integrity.
• A:H (High Availability Impact): The vulnerability can lead to a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated HTTP Request: An attacker with valid credentials can send a crafted HTTP request to the vulnerable firewall.cgi endpoint.
• Phishing or Social Engineering: Attackers may use phishing techniques to obtain valid credentials from users.

Exploitation Methods:

• Command Injection: By injecting malicious commands into the HTTP request, an attacker can execute arbitrary code on the router.
• Privilege Escalation: Once authenticated, the attacker can escalate privileges to gain full control over the device.

3. Affected Systems and Software Versions

Affected Systems:

• Wavlink AC3000 router

Software Versions:

• Firmware version M33A8.V5030.210505

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest firmware updates provided by Wavlink.
• Access Control: Implement strong authentication mechanisms and limit access to the router's management interface.
• Network Segmentation: Segregate the router from critical network segments to minimize the impact of a potential breach.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• User Education: Educate users about the risks of phishing and the importance of strong passwords.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity.

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, it could be exploited to compromise network security, leading to data breaches, unauthorized access, and potential disruption of services. The widespread use of such routers in both residential and commercial settings amplifies the potential impact.

6. Technical Details for Security Professionals

Vulnerability Details:

• Component: firewall.cgi
• Function: iptablesWebsFilterRun()
• Exploit Type: OS Command Injection
• Trigger: Authenticated HTTP request with crafted payload

Detection and Response:

• Log Analysis: Monitor router logs for unusual command execution or unauthorized access attempts.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous network traffic patterns.
• Incident Response: Develop an incident response plan specific to this vulnerability, including steps for containment, eradication, and recovery.

References:

• Talos Intelligence Report

Conclusion: The OS command injection vulnerability in the Wavlink AC3000 router is a critical issue that requires immediate attention. Organizations and individuals should prioritize patching and implementing robust security measures to mitigate the risk. Continuous monitoring and proactive security practices are essential to safeguard against potential exploitation.

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This analysis provides a comprehensive overview of the vulnerability, its potential impact, and recommended mitigation strategies, ensuring that cybersecurity professionals are well-equipped to address the threat effectively.