EUVD-2024-38341

Comprehensive Technical Analysis of EUVD-2024-38341

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-38341, also known as CVE-2024-39770, is a critical buffer overflow issue affecting the internet.cgi set_qos() functionality in the Wavlink AC3000 M33A8.V5030.210505 firmware. The vulnerability allows an authenticated attacker to send a specially crafted HTTP request, leading to a stack-based buffer overflow. The CVSS Base Score of 9.1 indicates a high severity due to the potential for complete system compromise.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:H (High Privileges Required): The attacker needs high-level privileges to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:C (Changed Scope): The vulnerability can affect resources beyond the security scope managed by the security authority.
• C:H (High Confidentiality Impact): There is a high impact on the confidentiality of the system.
• I:H (High Integrity Impact): There is a high impact on the integrity of the system.
• A:H (High Availability Impact): There is a high impact on the availability of the system.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated HTTP Request: An attacker with valid credentials can send a malicious HTTP request to the internet.cgi endpoint, specifically targeting the en_enable POST parameter.
• Network Access: The attacker must have network access to the vulnerable device, which could be achieved through local network access or remote access if the device is exposed to the internet.

Exploitation Methods:

• Buffer Overflow: By crafting an HTTP request with a payload that exceeds the buffer size for the en_enable parameter, the attacker can cause a stack-based buffer overflow.
• Code Execution: The buffer overflow can lead to arbitrary code execution, allowing the attacker to execute malicious code on the device.

3. Affected Systems and Software Versions

Affected Systems:

• Wavlink AC3000 routers running firmware version M33A8.V5030.210505.

Software Versions:

• Firmware version M33A8.V5030.210505 is specifically mentioned as vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate the vulnerable devices from critical networks to limit potential attack vectors.
• Access Control: Restrict access to the device's management interface to trusted IP addresses only.
• Credential Management: Ensure strong, unique credentials are used for device access and consider implementing multi-factor authentication (MFA).

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware updates from Wavlink as soon as they are available.
• Regular Audits: Conduct regular security audits and vulnerability assessments of network devices.
• Intrusion Detection: Implement intrusion detection systems (IDS) to monitor for suspicious network activity.

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 high severity and potential for complete system compromise, this vulnerability could be exploited for various malicious activities, including data exfiltration, unauthorized access, and denial of service attacks. The widespread use of such routers in homes and small businesses amplifies the potential impact, making it a critical concern for European cybersecurity.

6. Technical Details for Security Professionals

Vulnerability Details:

• Functionality Affected: internet.cgi set_qos()
• Parameter: en_enable POST parameter
• Exploit Type: Stack-based buffer overflow
• Attack Requirements: Authenticated HTTP request

Detection and Response:

• Log Analysis: Monitor logs for unusual HTTP requests targeting the internet.cgi endpoint.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous activity that may indicate an exploitation attempt.
• Patch Management: Ensure that all network devices are included in the organization's patch management program to promptly apply updates.

References:

• Talos Intelligence Report

Conclusion: EUVD-2024-38341 is a high-severity vulnerability that requires immediate attention from cybersecurity professionals. Organizations should prioritize mitigation strategies and closely monitor their networks for any signs of exploitation. Regular updates and proactive security measures are essential to protect against such critical vulnerabilities.