EUVD-2024-38354

Comprehensive Technical Analysis of EUVD-2024-38354

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38354, also known as CVE-2024-39760, is a critical OS command injection vulnerability affecting the Wavlink AC3000 M33A8.V5030.210505. The vulnerability resides in the login.cgi set_sys_init() functionality, specifically within the restart_min_value POST parameter. This vulnerability allows an attacker to execute arbitrary code by sending a specially crafted HTTP request.

Severity Evaluation:

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

The high base score indicates that this vulnerability is extremely severe. The attack vector (AV:N) is network-based, requiring low complexity (AC:L) and no privileges (PR:N) or user interaction (UI:N). The scope (S:C) is changed, and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated HTTP Requests: An attacker can send unauthenticated HTTP requests to the vulnerable endpoint, making it easy to exploit without needing any credentials.
• Command Injection: The attacker can inject malicious commands through the restart_min_value POST parameter, leading to arbitrary code execution.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can craft an HTTP request with a payload designed to inject commands into the system.
• Automated Scripts: Attackers can 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: This specific model and firmware version are affected by the vulnerability.

Software Versions:

• Firmware Version: M33A8.V5030.210505

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate 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.
• Patch Management: Implement a robust patch management process to ensure timely updates.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected Wavlink devices. The ease of exploitation and the potential for unauthenticated attacks make it a high-priority issue for cybersecurity professionals. The widespread use of such devices in homes and small businesses increases the risk of large-scale attacks, potentially leading to data breaches, service disruptions, and other security incidents.

6. Technical Details for Security Professionals

Vulnerability Details:

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

Exploitation Steps:

1. Identify Target: Use network scanning tools to identify devices running the vulnerable firmware version.
2. Craft Payload: Create an HTTP request with a malicious payload injected into the restart_min_value parameter.
3. Send Request: Send the crafted HTTP request to the vulnerable endpoint.
4. Execute Code: The injected commands will be executed on the target device, allowing for arbitrary code execution.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect unusual network traffic patterns indicative of exploitation attempts.
• Log Analysis: Regularly analyze logs for suspicious activities, particularly around the login.cgi endpoint.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

References:

• Talos Intelligence Report: TALOS-2024-2018

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.