EUVD-2023-41592

Comprehensive Technical Analysis of EUVD-2023-41592

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-41592 pertains to a stack overflow in the page parameter within the frmL7ProtForm function of Tenda F1202 V1.0BR_V1.2.0.20(408) and FH1202_V1.2.0.19_EN. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• AV:N (Attack Vector: Network): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low): The attack requires low complexity to exploit.
• PR:N (Privileges Required: None): No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None): No user interaction is required.
• S:U (Scope: Unchanged): The vulnerability does not change the security scope.
• C:H (Confidentiality: High): The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High): The vulnerability has a high impact on integrity.
• A:H (Availability: High): The vulnerability has a high impact on availability.

This high severity score underscores the critical nature of the vulnerability, making it a high-priority issue for immediate attention.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability can be exploited through the following methods:

• Remote Code Execution (RCE): An attacker can send specially crafted network packets to the affected device, causing a stack overflow. This can lead to arbitrary code execution, allowing the attacker to take control of the device.
• Denial of Service (DoS): By exploiting the stack overflow, an attacker can cause the device to crash or become unresponsive, leading to a denial of service.
• Information Disclosure: The vulnerability might allow an attacker to read sensitive information from the device's memory, compromising confidentiality.

3. Affected Systems and Software Versions

The vulnerability affects the following Tenda devices and firmware versions:

• Tenda F1202 V1.0BR_V1.2.0.20(408)
• Tenda FH1202_V1.2.0.19_EN

Users and organizations utilizing these specific versions are at risk and should take immediate action to mitigate the vulnerability.

4. Recommended Mitigation Strategies

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

• Firmware Update: Apply the latest firmware updates provided by Tenda. Ensure that the devices are running the most recent, patched versions.
• Network Segmentation: Isolate affected devices on a separate network segment to limit the potential impact of an exploit.
• Access Control: Implement strict access controls to limit who can access and manage the devices.
• Monitoring and Logging: Enable comprehensive monitoring and logging to detect any suspicious activity or attempts to exploit the vulnerability.
• Firewall Rules: Configure firewall rules to restrict access to the affected devices, allowing only trusted sources to communicate with them.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using Tenda devices. The potential for remote code execution and denial of service attacks can lead to widespread disruption and data breaches. Given the critical nature of the vulnerability, it is essential for European cybersecurity authorities to issue advisories and ensure that affected parties take appropriate mitigation measures.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack overflow in the page parameter within the frmL7ProtForm function.
• Exploitability: The vulnerability can be exploited remotely with low complexity, requiring no user interaction or privileges.
• Impact: High impact on confidentiality, integrity, and availability.
• References: For further technical details, refer to the GitHub repository: FirmRec/IoT-Vulns.

Security professionals should prioritize the identification and mitigation of this vulnerability in their environments. Regular security audits and vulnerability assessments should be conducted to ensure that all devices are up-to-date and secure.

Conclusion

EUVD-2023-41592 represents a critical vulnerability in specific Tenda devices, posing significant risks to confidentiality, integrity, and availability. Immediate action is required to mitigate this vulnerability, including firmware updates, network segmentation, and enhanced monitoring. The European cybersecurity community should remain vigilant and proactive in addressing this and similar vulnerabilities to maintain a robust security posture.