EUVD-2023-30808

Comprehensive Technical Analysis of EUVD-2023-30808

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-30808, also known as CVE-2023-27018, pertains to a stack overflow in the Tenda AC10 router firmware version US_AC10V4.0si_V16.03.10.13_cn. This vulnerability is located within the sub_45EC1C function. The stack overflow can be exploited to cause a Denial of Service (DoS) or execute arbitrary code, leading to potential unauthorized access and control over the affected device.

The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring vector 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.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through network-based exploitation. An attacker can craft a malicious payload designed to trigger the stack overflow in the sub_45EC1C function. This can be achieved by sending specially crafted network packets to the vulnerable device.

Potential exploitation methods include:

• DoS Attack: Sending a crafted payload to crash the device, leading to a Denial of Service.
• Remote Code Execution (RCE): Executing arbitrary code on the device, which can lead to full control over the router, including the ability to intercept traffic, modify settings, and exfiltrate data.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Tenda AC10 router with the firmware version US_AC10V4.0si_V16.03.10.13_cn. Other versions of the Tenda AC10 router firmware may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their devices to determine if they are at risk.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to a version that addresses this vulnerability. Tenda should release a patched version of the firmware.
• 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 from untrusted networks.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity that may indicate an attempt to exploit this vulnerability.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the Tenda AC10 router. The potential for unauthorized access and control over network devices can lead to data breaches, service disruptions, and other security incidents. Given the critical nature of the vulnerability, it is essential for European cybersecurity authorities to issue advisories and ensure that affected users and organizations take appropriate mitigation steps.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The stack overflow occurs in the sub_45EC1C function.
• Exploit Payload: The crafted payload should be designed to overflow the stack buffer within the vulnerable function.
• Detection: Monitor network traffic for unusual patterns that may indicate an attempt to exploit the vulnerability. Look for repeated or malformed packets targeting the router.
• Response: In the event of an exploit, isolate the affected device immediately and perform a forensic analysis to determine the extent of the compromise.

Conclusion

EUVD-2023-30808 is a critical vulnerability affecting the Tenda AC10 router firmware. The stack overflow in the sub_45EC1C function can lead to DoS attacks or remote code execution, posing a significant risk to network security. Immediate mitigation steps, including firmware updates and network segmentation, are essential to protect against potential exploits. European cybersecurity authorities should prioritize awareness and mitigation efforts to safeguard against this vulnerability.