EUVD-2025-4503

Comprehensive Technical Analysis of EUVD-2025-4503

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4503 affects Tenda O4 V3.0 V1.0.0.10(2936) and is classified as a Buffer Overflow in the function SafeSetMacFilter of the file /goform/setMacFilterList. The vulnerability is triggered via the arguments remark, type, and time.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability. The vector breakdown shows:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score reflects the potential for severe impact on confidentiality, integrity, and availability without requiring special privileges or user interaction.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the attack vector is network-based, an attacker can exploit this vulnerability remotely.
• Unauthenticated Access: The attacker does not need any special privileges or user interaction to exploit this vulnerability.

Exploitation Methods:

• Buffer Overflow: An attacker can send specially crafted input to the SafeSetMacFilter function, causing a buffer overflow. This can lead to arbitrary code execution, denial of service, or other malicious activities.
• Payload Delivery: The attacker can inject malicious payloads through the remark, type, and time arguments, potentially leading to remote code execution.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda O4 V3.0

Affected Software Versions:

• Firmware version V1.0.0.10(2936)

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest firmware updates provided by Tenda as soon as they are available.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable device.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities.
• User Education: Educate users on the importance of updating firmware and maintaining security best practices.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using Tenda O4 V3.0 devices. Given the critical nature of the vulnerability, it could be exploited for large-scale attacks, leading to data breaches, service disruptions, and potential financial losses.

Regulatory Compliance:

• Organizations must comply with GDPR and other relevant regulations to ensure data protection and incident response readiness.
• Reporting the vulnerability to national CERTs and ENISA can help in coordinating a broader response and mitigation strategy.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: SafeSetMacFilter
• File: /goform/setMacFilterList
• Arguments: remark, type, time

Exploitation Steps:

1. Identify Target: Locate the vulnerable Tenda O4 V3.0 device on the network.
2. Craft Payload: Develop a payload that exploits the buffer overflow in the SafeSetMacFilter function.
3. Deliver Payload: Send the payload via the network to the vulnerable device.
4. Execute Payload: Achieve remote code execution or denial of service.

Detection and Monitoring:

• Log Analysis: Monitor logs for unusual activities related to the setMacFilterList function.
• Traffic Analysis: Use network traffic analysis tools to detect anomalous traffic patterns.
• Behavioral Analysis: Implement behavioral analysis to identify deviations from normal device behavior.

References:

• NVD Entry
• GitHub Repository

By following these recommendations and maintaining a proactive security posture, organizations can mitigate the risks associated with this critical vulnerability.