EUVD-2023-41595

Comprehensive Technical Analysis of EUVD-2023-41595

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-41595, also known as CVE-2023-37718, pertains to a stack overflow in the page parameter within the fromSafeClientFilter function in Tenda F1202 V1.0BR_V1.2.0.20(408) and FH1202_V1.2.0.19_EN. 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): 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 for the attack to succeed.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability allows for significant breaches of confidentiality.
• Integrity (I): High (H) - The vulnerability allows for significant breaches of integrity.
• Availability (A): High (H) - The vulnerability allows for significant breaches of availability.

This high severity score underscores the critical nature of the vulnerability, making it a high-priority issue for immediate remediation.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability in the fromSafeClientFilter function can be exploited through the following methods:

• Remote Code Execution (RCE): An attacker can send specially crafted network packets to the affected device, causing a stack overflow. This can lead to arbitrary code execution, allowing the attacker to take control of the device.
• Denial of Service (DoS): By sending malformed data to the page parameter, an attacker can cause the device to crash or become unresponsive, leading to a denial of service.
• Data Exfiltration: The vulnerability can be used to read sensitive information from the device's memory, potentially exposing confidential data.

3. Affected Systems and Software Versions

The vulnerability affects the following Tenda devices and firmware versions:

• Tenda F1202 V1.0BR_V1.2.0.20(408)
• Tenda FH1202_V1.2.0.19_EN

It is crucial to identify and update these devices to mitigate the risk associated with this vulnerability.

4. Recommended Mitigation Strategies

To mitigate the risk posed by EUVD-2023-41595, the following strategies are recommended:

• Firmware Update: Immediately update the firmware of affected Tenda devices to the latest version provided by the manufacturer.
• Network Segmentation: Isolate affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to restrict access to the affected devices, allowing only necessary traffic.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for signs of exploitation attempts.
• 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 Tenda devices. The potential for remote code execution and data exfiltration can lead to severe breaches, impacting confidentiality, integrity, and availability. This underscores the need for robust cybersecurity measures and timely updates to mitigate such risks.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack Overflow
• Affected Function: fromSafeClientFilter
• Parameter: page
• Exploitation Method: Crafted network packets targeting the page parameter
• Mitigation: Update firmware, implement network segmentation, and deploy IDS

References:

• GitHub Report

By addressing this vulnerability promptly and effectively, organizations can significantly reduce the risk of cyber-attacks and ensure the security of their networks and data.