EUVD-2024-38365

Comprehensive Technical Analysis of EUVD-2024-38365

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38365, also known as CVE-2024-39359, is a stack-based buffer overflow in the DeleteMac() functionality of the wireless.cgi script in Wavlink AC3000 M33A8.V5030.210505. This vulnerability allows an attacker to execute arbitrary commands by sending a specially crafted HTTP request. The CVSS Base Score of 9.1 indicates a critical severity level. The CVSS 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.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through an authenticated HTTP request. An attacker with high-level privileges can craft a malicious HTTP request targeting the DeleteMac() function in wireless.cgi. This request can overflow the stack buffer, leading to arbitrary command execution. Potential exploitation methods include:

• Remote Code Execution (RCE): By injecting malicious code into the HTTP request, an attacker can execute arbitrary commands on the affected device.
• Privilege Escalation: If the attacker gains initial access through another vulnerability, they can use this buffer overflow to escalate privileges and gain full control over the device.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Product: Wavlink AC3000
• Version: M33A8.V5030.210505

Other versions of the Wavlink AC3000 or similar devices may also be affected if they share the same codebase or functionality.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Patch Management: Ensure that the firmware of the Wavlink AC3000 is updated to the latest version provided by the vendor.
• Access Control: Implement strict access controls to limit high-level privileges to trusted users only.
• Network Segmentation: Segregate the network to isolate critical devices and reduce the attack surface.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor and detect suspicious network activities.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security gaps.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Wavlink AC3000 devices. Given the critical nature of the vulnerability, it can lead to:

• Data Breaches: Unauthorized access to sensitive information.
• Service Disruption: Compromise of network availability and integrity.
• Compliance Issues: Potential violations of data protection regulations such as GDPR.

Organizations should prioritize addressing this vulnerability to maintain compliance and protect against potential cyber threats.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack-based buffer overflow.
• Affected Function: DeleteMac() in wireless.cgi.
• Exploitation Method: Crafted HTTP request leading to arbitrary command execution.
• Detection: Monitor for unusual HTTP requests targeting wireless.cgi and look for signs of buffer overflow exploitation.
• Mitigation: Implement input validation and sanitization for HTTP requests, and ensure that the firmware is up-to-date.

References:

• Talos Intelligence Report

By addressing this vulnerability promptly and effectively, organizations can significantly reduce the risk of exploitation and maintain a robust cybersecurity posture.