EUVD-2023-41578

Comprehensive Technical Analysis of EUVD-2023-41578

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-41578 pertains to a stack overflow in the Tenda FH1203 V2.0.1.6 firmware, specifically within the addWifiMacFilter function via the deviceId parameter. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS 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:N): Network, meaning the vulnerability can be exploited remotely over the network.
• Attack Complexity (AC:L): Low, indicating that the attack does not require special conditions or privileges.
• Privileges Required (PR:N): None, meaning no privileges are required to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability affects the same security scope.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

Given these metrics, the vulnerability poses a significant risk to the confidentiality, integrity, and availability of the affected systems.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability can be exploited by sending a specially crafted deviceId parameter to the addWifiMacFilter function. This can lead to arbitrary code execution, allowing an attacker to:

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

Potential attack vectors include:

• Network-Based Attacks: Exploiting the vulnerability over the network without requiring physical access to the device.
• Man-in-the-Middle (MitM) Attacks: Intercepting and modifying network traffic to inject malicious payloads.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda FH1203: Firmware version V2.0.1.6.

Other versions of the Tenda FH1203 firmware may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version and apply updates as necessary.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to the latest version provided by Tenda.
• Network Segmentation: Isolate IoT devices on a separate network segment to limit the attack surface.
• Firewall Rules: Implement strict firewall rules to restrict access to the device.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
• Regular Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on European Cybersecurity Landscape

The vulnerability in Tenda FH1203 devices poses a significant risk to European cybersecurity, particularly in environments where these devices are widely deployed, such as homes, small businesses, and public Wi-Fi networks. The potential for remote code execution and data exfiltration can lead to:

• Compromised Networks: Attackers gaining control over networks and devices.
• Data Breaches: Sensitive information being accessed and exfiltrated.
• Service Disruptions: Denial of service attacks leading to downtime and service interruptions.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack overflow.
• Affected Function: addWifiMacFilter.
• Parameter: deviceId.
• Exploitation: Crafted input to the deviceId parameter can overflow the stack, leading to arbitrary code execution.
• References: Further technical details and proof-of-concept (PoC) code can be found at GitHub Repository.

Security professionals should:

• Monitor Network Traffic: Use network monitoring tools to detect and analyze suspicious traffic patterns.
• Patch Management: Ensure that all devices are regularly updated with the latest firmware.
• Incident Response: Develop and implement an incident response plan to quickly address and mitigate any potential exploitation.

Conclusion

The stack overflow vulnerability in Tenda FH1203 V2.0.1.6 is critical and requires immediate attention. By understanding the potential attack vectors, affected systems, and recommended mitigation strategies, cybersecurity professionals can effectively protect against this threat and maintain the integrity of European cybersecurity infrastructure.