EUVD-2024-53630

Comprehensive Technical Analysis of EUVD-2024-53630

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in Tenda AC18 V15.03.05.19 involves a stack overflow in the firewallEn parameter within the formSetFirewallCfg function. This vulnerability is critical, as indicated by its CVSS Base Score of 9.8. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights several key aspects:

• Attack Vector (AV:N): The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC:L): The attack is of low complexity, meaning it does not require specialized conditions or knowledge.
• Privileges Required (PR:N): No privileges are required to exploit this vulnerability.
• User Interaction (UI:N): No user interaction is necessary for the exploit to succeed.
• Scope (S:U): The vulnerability affects the same security scope.
• Confidentiality (C:H): The vulnerability has a high impact on confidentiality.
• Integrity (I:H): The vulnerability has a high impact on integrity.
• Availability (A:H): The vulnerability has a high impact on availability.

Given these factors, the severity of this vulnerability is extremely high, posing significant risks to affected systems.

2. Potential Attack Vectors and Exploitation Methods

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

• Remote Code Execution (RCE): An attacker could send a specially crafted request to the formSetFirewallCfg function, causing a stack overflow and potentially allowing for arbitrary code execution.
• Denial of Service (DoS): The stack overflow could crash the device, leading to a denial of service.
• Data Corruption: The overflow could corrupt critical data, leading to unpredictable behavior or system instability.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Device: Tenda AC18
• Firmware Version: V15.03.05.19

Users and organizations running this firmware version on their Tenda AC18 devices are at risk.

4. Recommended Mitigation Strategies

To mitigate the risks associated with this vulnerability, the following actions are recommended:

• Firmware Update: Immediately update the firmware to a version that addresses this vulnerability. If an update is not available, contact Tenda for guidance.
• Network Segmentation: Isolate affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to restrict access to the device, allowing only trusted IP addresses.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect any suspicious activity targeting the formSetFirewallCfg function.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on any attempts to exploit this vulnerability.

5. Impact on European Cybersecurity Landscape

The discovery of this vulnerability underscores the importance of robust cybersecurity measures in the European Union. Given the widespread use of Tenda devices, this vulnerability could have significant implications for both individual users and organizations. The high severity score indicates that successful exploitation could lead to severe data breaches, service disruptions, and potential financial losses.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack Overflow
• Affected Function: formSetFirewallCfg
• Affected Parameter: firewallEn
• Exploit Mechanism: Crafted input to the firewallEn parameter can cause a stack overflow, leading to potential RCE, DoS, or data corruption.
• Detection: Monitor network traffic for unusual patterns targeting the formSetFirewallCfg function. Implement anomaly detection to identify deviations from normal behavior.
• Response: In the event of an exploit attempt, isolate the affected device, capture logs for forensic analysis, and apply the latest firmware updates.

Conclusion

The stack overflow vulnerability in Tenda AC18 V15.03.05.19 is a critical issue that requires immediate attention. Organizations and individuals should prioritize updating their firmware and implementing robust security measures to mitigate the risks. The European cybersecurity community should remain vigilant and collaborate to address such vulnerabilities promptly.

For further details, refer to the official references provided in the EUVD entry: GitHub Repository.