EUVD-2023-30810

Comprehensive Technical Analysis of EUVD-2023-30810

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-30810, also known as CVE-2023-27020, pertains to a stack overflow in the saveParentControlInfo 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 level of severity. 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): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not affect other security scopes.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

Given these metrics, the vulnerability poses a significant risk, allowing attackers to cause a Denial of Service (DoS) or execute arbitrary code via a crafted payload.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is network-based, meaning an attacker can exploit this vulnerability remotely. The exploitation method involves sending a specially crafted payload to the saveParentControlInfo function, which triggers a stack overflow. 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.

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 firmware or different models may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their Tenda AC10 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 provide 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, allowing only trusted IP addresses.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity that may indicate an exploitation attempt.
• 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 threat to the European cybersecurity landscape, particularly for organizations and individuals using Tenda AC10 routers. The potential for remote code execution and DoS attacks can lead to data breaches, service disruptions, and unauthorized access to sensitive information. Given the widespread use of routers in both home and enterprise environments, the impact could be extensive if not addressed promptly.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: saveParentControlInfo
• Exploitation Method: Crafted payload to trigger stack overflow.
• Payload Construction: The payload should be designed to overflow the stack buffer in the saveParentControlInfo function, allowing for code injection and execution.
• Detection: Monitor network traffic for unusual patterns or payloads targeting the saveParentControlInfo function. Implement logging and alerting mechanisms to detect and respond to exploitation attempts.
• Patch Analysis: Review the patched firmware version to understand the changes made to mitigate the vulnerability. Ensure that the patch effectively addresses the stack overflow issue.

Conclusion

EUVD-2023-30810 is a critical vulnerability that requires immediate attention from both Tenda and users of the affected devices. By understanding the technical details and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.

References

• GitHub Repository
• CVSS Calculator

For further updates and patches, refer to Tenda's official support channels and security advisories.