EUVD-2023-28231

Comprehensive Technical Analysis of EUVD-2023-28231

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-28231 affects the Tenda AC18 router, specifically version V15.03.05.19. The issue is a buffer overflow vulnerability in the /goform/fromSetWirelessRepeat endpoint. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• Scope (S): Unchanged (U) - The vulnerability does not affect resources beyond the security scope managed by the security authority.
• Confidentiality (C): High (H) - The vulnerability can result in a complete loss of confidentiality.
• Integrity (I): High (H) - The vulnerability can result in a complete loss of integrity.
• Availability (A): High (H) - The vulnerability can result in a complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The buffer overflow vulnerability in the /goform/fromSetWirelessRepeat endpoint can be exploited by sending a specially crafted HTTP request to the router. This can lead to arbitrary code execution, allowing an attacker to:

• Execute Remote Code: Run malicious code on the router, potentially leading to full control of the device.
• Denial of Service (DoS): Crash the router, causing a denial of service.
• Data Exfiltration: Access and exfiltrate sensitive information stored on the router.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda AC18 Router
• Firmware Version: V15.03.05.19

Other versions of the Tenda AC18 router may also be affected, but this has not been confirmed. Users should verify the firmware version of their devices to determine if they are at risk.

4. Recommended Mitigation Strategies

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

• Update Firmware: Immediately update the router firmware to the latest version provided by Tenda.
• Network Segmentation: Isolate the router from critical networks to limit the potential impact of an attack.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.
• Monitoring: Enable logging and monitoring to detect any suspicious activity on the network.
• Disable Remote Management: If not necessary, disable remote management features to reduce the attack surface.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the Tenda AC18 router. Given the critical nature of the vulnerability, it could be exploited by threat actors to compromise network security, exfiltrate data, and disrupt services. This underscores the importance of timely patch management and proactive security measures in the European cybersecurity landscape.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Exploit Path: The vulnerability is triggered via the /goform/fromSetWirelessRepeat endpoint.
• Payload Construction: Crafting a payload involves sending a malformed HTTP request that exceeds the buffer size allocated for the input.
• Detection: Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) can be configured to detect and block suspicious traffic targeting the vulnerable endpoint.
• Log Analysis: Review router logs for any unusual activity or repeated attempts to access the /goform/fromSetWirelessRepeat endpoint.
• Patch Analysis: Verify the integrity and authenticity of firmware updates from Tenda to ensure they address the vulnerability effectively.

Conclusion

EUVD-2023-28231 is a critical buffer overflow vulnerability affecting the Tenda AC18 router. Organizations and individuals should prioritize updating their firmware and implementing robust security measures to mitigate the risk. Continuous monitoring and proactive security practices are essential to safeguard against such vulnerabilities in the European cybersecurity landscape.

References

• GitHub Repository
• Aliases: CVE-2023-24170, GSD-2023-24170
• Assigner: Mitre

For further technical details and updates, refer to the official EUVD entry and associated references.