EUVD-2023-37831

Comprehensive Technical Analysis of EUVD-2023-37831

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-37831 pertains to a stack overflow in the get_parentControl_list_Info function of Tenda AC8V4.0-V16.03.34.06. This vulnerability is triggered via the time parameter. 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 does not require specialized conditions.
• Privileges Required (PR:N): None, meaning no 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, 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.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability can be exploited by sending a specially crafted request to the get_parentControl_list_Info function with a malicious time parameter. This could lead to arbitrary code execution, allowing an attacker to:

• Execute Remote Code: Run malicious code on the affected device.
• Gain Unauthorized Access: Access sensitive information or control the device.
• Denial of Service (DoS): Crash the device, rendering it unavailable.

3. Affected Systems and Software Versions

The vulnerability specifically affects Tenda AC8V4.0 devices running firmware version V16.03.34.06. It is crucial to identify all devices running this firmware version within an organization's network to assess the scope of potential impact.

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.
• Network Segmentation: Isolate affected devices from critical network segments to limit potential damage.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the get_parentControl_list_Info function.
• Access Controls: Implement strict access controls to limit exposure to the vulnerable function.
• Regular Audits: Conduct regular security audits to identify and address similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

The presence of this vulnerability in widely used networking equipment poses a significant risk to European organizations. The potential for remote exploitation and the high impact on confidentiality, integrity, and availability make it a critical concern. Organizations must prioritize patching and monitoring to prevent potential breaches and ensure compliance with European cybersecurity regulations such as GDPR and NIS Directive.

6. Technical Details for Security Professionals

• Vulnerability Type: Stack Overflow
• Affected Function: get_parentControl_list_Info
• Trigger Parameter: time
• Exploitation Method: Crafted network request to the vulnerable function
• Impact: Remote code execution, unauthorized access, DoS
• Mitigation: Firmware update, network segmentation, IDS, access controls, regular audits

References

For further technical details and exploitation methods, refer to the following resources:

• GitHub Repository
• GitHub Tree

Conclusion

EUVD-2023-37831 represents a critical vulnerability in Tenda AC8V4.0 devices that requires immediate attention. Organizations should prioritize updating affected devices and implementing robust security measures to mitigate the risk of exploitation. The high severity and potential impact underscore the importance of proactive cybersecurity practices in protecting European networks and data.