EUVD-2024-35374

Comprehensive Technical Analysis of EUVD-2024-35374

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-35374, also known as CVE-2024-35571, pertains to a stack overflow in the Tenda AX1806 v1.0.0.1 router. The issue arises from improper handling of the iptv.stb.mode parameter within the formSetIptv function. 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:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
• Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect resources beyond the security scope managed by the security authority.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

This high score underscores the critical nature of the vulnerability, which can lead to severe consequences if exploited.

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 a specially crafted request to the formSetIptv function, causing a buffer overflow. This can lead to arbitrary code execution on the affected device.
• Denial of Service (DoS): By sending malformed data, an attacker can crash the device, leading to a denial of service.
• Information Disclosure: The overflow might allow an attacker to read sensitive information from the stack, potentially leading to further exploitation.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda AX1806 v1.0.0.1: This version of the router is confirmed to be vulnerable. Other versions may also be affected, but this has not been confirmed in the provided information.

4. Recommended Mitigation Strategies

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

• Patch Management: Ensure that the router firmware is updated to the latest version provided by Tenda. Regularly check for updates and apply them promptly.
• Network Segmentation: Isolate the router from critical networks to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity that may indicate an attempt to exploit this vulnerability.
• User Education: Educate users on the importance of not exposing the router's management interface to the internet.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape due to the widespread use of Tenda routers in both residential and small business environments. The potential for remote code execution and denial of service attacks can lead to:

• Data Breaches: Sensitive information can be compromised, leading to data breaches.
• Service Disruptions: Critical services relying on the affected routers may experience disruptions.
• Reputation Damage: Organizations using the affected routers may suffer reputational damage if an exploit leads to a publicized breach.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: formSetIptv
• Vulnerable Parameter: iptv.stb.mode
• Exploitation Method: Crafting a request that exceeds the buffer size allocated for the iptv.stb.mode parameter.
• Detection: Monitor network traffic for unusual patterns targeting the formSetIptv function. Implement logging and alerting mechanisms for suspicious activities.
• Response: In case of an exploit, isolate the affected device immediately and perform a forensic analysis to determine the extent of the compromise.

Conclusion

The vulnerability EUVD-2024-35374 in Tenda AX1806 v1.0.0.1 is critical and requires immediate attention. Organizations and individuals using the affected router should prioritize updating the firmware and implementing the recommended mitigation strategies to protect against potential exploits. The European cybersecurity community should remain vigilant and collaborate to address similar vulnerabilities proactively.