EUVD-2024-38373

Comprehensive Technical Analysis of EUVD-2024-38373

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38373, also known as CVE-2024-39774, is a buffer overflow issue in the adm.cgi set_sys_adm() functionality of the Wavlink AC3000 M33A8.V5030.210505 firmware. This vulnerability allows an authenticated attacker to send a specially crafted HTTP request, leading to a stack-based buffer overflow. The CVSS (Common Vulnerability Scoring System) base score of 9.1 indicates a critical severity level. The scoring 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 for the attack to succeed.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - The vulnerability can lead to a complete loss of confidentiality.
• Integrity (I): High (H) - The vulnerability can lead to a complete loss of integrity.
• Availability (A): High (H) - The vulnerability can lead to a complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through an authenticated HTTP request. An attacker with valid credentials can craft a malicious HTTP request targeting the adm.cgi set_sys_adm() functionality. This request can overflow the buffer, potentially leading to arbitrary code execution, denial of service, or unauthorized access to sensitive information.

Exploitation Methods:

• Arbitrary Code Execution: By carefully crafting the payload, an attacker can execute arbitrary code on the affected device.
• Denial of Service (DoS): The buffer overflow can crash the device, leading to a denial of service.
• Information Disclosure: The attacker can potentially access sensitive information stored on the device.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Wavlink AC3000 router with firmware version M33A8.V5030.210505. Other versions of the firmware or different models may also be affected, but this has not been confirmed.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest firmware updates provided by Wavlink as soon as they are available.
• Access Control: Restrict administrative access to trusted users only.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit potential damage.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection: Implement intrusion detection systems (IDS) to monitor for suspicious activity.
• User Training: Educate users on the importance of strong passwords and the risks associated with unauthorized access.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Wavlink AC3000 routers. Given the critical nature of the vulnerability, it could be exploited to compromise network security, leading to data breaches, service disruptions, and potential financial losses. The European Union's cybersecurity frameworks, such as the NIS Directive and GDPR, emphasize the importance of timely vulnerability management and incident response, making it crucial for organizations to address this issue promptly.

6. Technical Details for Security Professionals

Vulnerability Details:

• Functionality Affected: adm.cgi set_sys_adm()
• Type of Vulnerability: Stack-based buffer overflow
• Exploitation Requirements: Authenticated HTTP request

Detection and Response:

• Log Analysis: Monitor logs for unusual HTTP requests targeting the adm.cgi endpoint.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous activities that may indicate an exploitation attempt.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• Talos Intelligence Report: TALOS-2024-2030

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2024-38373 and enhance their overall cybersecurity posture.