EUVD-2024-38353

Comprehensive Technical Analysis of EUVD-2024-38353

1. Vulnerability Assessment and Severity Evaluation

The EUVD entry EUVD-2024-38353 describes multiple OS command injection vulnerabilities in the login.cgi set_sys_init() functionality of the Wavlink AC3000 M33A8.V5030.210505 firmware. The vulnerability allows an attacker to execute arbitrary code by sending a specially crafted HTTP request. The restart_hour_value POST parameter is specifically identified as a vector for command injection.

Severity Evaluation:

• CVSS Base Score: 10.0
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

The CVSS score of 10.0 indicates a critical vulnerability. The attack vector (AV:N) is network-based, requiring low complexity (AC:L) and no privileges (PR:N) or user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), and the scope is changed (S:C), meaning the vulnerability can affect components beyond the initial security scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated HTTP Requests: An attacker can send a crafted HTTP request to the vulnerable endpoint without needing authentication.
• Command Injection: The restart_hour_value POST parameter can be manipulated to inject malicious commands, leading to arbitrary code execution.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can use tools like curl or custom scripts to send malicious HTTP requests to the vulnerable endpoint.
• Automated Scripts: Exploitation scripts can be developed to automate the attack, making it easier to target multiple devices.

3. Affected Systems and Software Versions

Affected Systems:

• Wavlink AC3000 Router

Software Versions:

• Firmware Version: M33A8.V5030.210505

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the vulnerable endpoint.
• Monitoring: Increase monitoring of network traffic to detect and respond to suspicious activities.

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware updates provided by Wavlink as soon as they are available.
• Input Validation: Ensure that all input parameters are properly validated and sanitized to prevent command injection.
• Access Controls: Implement strong access controls to restrict access to the management interface.

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 for various malicious activities, including:

• Data Breaches: Unauthorized access to sensitive information.
• Network Compromise: Compromise of internal networks, leading to further attacks.
• Service Disruption: Denial of service attacks affecting network availability.

The widespread use of routers in both home and enterprise environments amplifies the potential impact, making it a critical concern for European cybersecurity.

6. Technical Details for Security Professionals

Vulnerability Details:

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

Exploitation Example:

curl -X POST -d "restart_hour_value=`command`" http://<router_ip>/login.cgi

Detection:

• Log Analysis: Monitor logs for unusual HTTP requests to the login.cgi endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS rules to detect and alert on suspicious traffic patterns.

Response:

• Incident Response Plan: Develop and implement an incident response plan to quickly address any detected exploitation attempts.
• Patch Management: Ensure a robust patch management process to apply updates promptly.

References:

• Talos Intelligence Report: TALOS-2024-2018

By addressing this vulnerability promptly and effectively, organizations can mitigate the risk of exploitation and protect their networks from potential attacks.