EUVD-2024-53625

Comprehensive Technical Analysis of EUVD-2024-53625

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-53625 affects Tenda AC18 V15.03.05.19, specifically involving a stack overflow in the ssid parameter within the form_fast_setting_wifi_set function. 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 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 for the attack to succeed.
• Scope (S:U): Unchanged, meaning the vulnerability affects the same security scope.
• Confidentiality (C:H): High, indicating a complete loss of confidentiality.
• Integrity (I:H): High, indicating a complete loss of integrity.
• Availability (A:H): High, indicating a complete loss of availability.

This high base score underscores the critical nature of the vulnerability, making it a top priority for immediate remediation.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability in the ssid parameter can be exploited through several attack vectors:

• Remote Exploitation: An attacker can send a specially crafted network packet containing a malicious ssid value to the vulnerable device. This can be done over the network, making it a remote attack vector.
• Local Network Attack: An attacker with access to the local network can exploit the vulnerability by sending malicious packets directly to the device.
• Phishing and Social Engineering: An attacker could trick a user into connecting to a malicious Wi-Fi network, which then sends the exploit to the vulnerable device.

Exploitation methods may include:

• Buffer Overflow: Crafting a payload that overflows the stack buffer allocated for the ssid parameter, leading to arbitrary code execution.
• Denial of Service (DoS): Sending a large ssid value to crash the device, causing a denial of service.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda AC18: Firmware version V15.03.05.19.

Other versions of the Tenda AC18 firmware may also be affected, but this has not been confirmed. It is advisable to check for updates and patches from the vendor.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately apply any available firmware updates from Tenda. Regularly check for updates and apply them as soon as they are released.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit the attack surface.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the device.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the ssid parameter.
• User Education: Educate users about the risks of connecting to unknown Wi-Fi networks and the importance of keeping firmware up to date.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly in environments where Tenda AC18 devices are widely deployed. The potential for remote exploitation and the high impact on confidentiality, integrity, and availability make it a critical concern for both home users and businesses. The widespread use of such devices in small to medium-sized enterprises (SMEs) and home offices (SOHO) environments increases the risk of large-scale attacks.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: form_fast_setting_wifi_set
• Vulnerable Parameter: ssid
• Exploit Mechanism: Stack overflow leading to arbitrary code execution or denial of service.
• Detection: Monitor network traffic for abnormally large ssid values or unusual patterns in Wi-Fi settings requests.
• Response: Implement network-level protections and ensure that all devices are updated to the latest firmware version.

Conclusion

EUVD-2024-53625 represents a critical vulnerability in Tenda AC18 V15.03.05.19, requiring immediate attention from cybersecurity professionals. The potential for remote exploitation and the high impact on security make it a top priority for mitigation. Regular updates, network segmentation, and user education are essential steps to protect against this vulnerability.

References

• GitHub Repository
• Mitre CVE Database

This analysis provides a comprehensive overview for cybersecurity experts to understand and address the vulnerability effectively.