EUVD-2023-30803

Comprehensive Technical Analysis of EUVD-2023-30803

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-30803, also known as CVE-2023-27013, pertains to a stack overflow in the get_parentControl_list_Info function within the Tenda AC10 US_AC10V4.0si_V16.03.10.13_cn firmware. This vulnerability is critical, with a CVSS base score of 9.8, indicating a high risk to affected systems. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:

• Attack Vector (AV:N): Network-based attack, meaning it can be exploited remotely.
• Attack Complexity (AC:L): Low complexity, indicating that the attack does not require specialized conditions.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is needed.
• Scope (S:U): The vulnerability affects the same security scope.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through network-based exploitation. An attacker can craft a malicious payload to trigger the stack overflow in the get_parentControl_list_Info function. This can lead to:

• Denial of Service (DoS): The device may crash or become unresponsive.
• Arbitrary Code Execution: The attacker can execute arbitrary code, potentially leading to full control over the device.

Exploitation methods may include:

• Remote Exploitation: Sending specially crafted network packets to the device.
• Local Exploitation: If an attacker has local access, they can exploit the vulnerability to escalate privileges.

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 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 as soon as possible.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to restrict access to the device from untrusted networks.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the vulnerable function.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues proactively.

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 remote exploitation and arbitrary code execution can lead to data breaches, unauthorized access, and service disruptions. This underscores the importance of timely patch management and robust cybersecurity practices within the EU.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: get_parentControl_list_Info
• Issue: Stack overflow due to improper bounds checking.
• Impact: Can lead to DoS or arbitrary code execution.

Exploitation Steps:

1. Identify Target: Scan the network for devices running the vulnerable firmware version.
2. Craft Payload: Develop a payload that triggers the stack overflow in the get_parentControl_list_Info function.
3. Deliver Payload: Send the crafted payload to the target device via network communication.
4. Exploit: Achieve DoS or execute arbitrary code on the device.

Detection and Response:

• Log Analysis: Monitor logs for unusual activity or errors related to the get_parentControl_list_Info function.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous behavior indicative of a stack overflow.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• GitHub Repository

By following these recommendations and staying vigilant, organizations can significantly reduce the risk posed by this vulnerability.