EUVD-2023-41591

Comprehensive Technical Analysis of EUVD-2023-41591

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-41591, also known as CVE-2023-37714, pertains to a stack overflow in the fromRouteStatic function within the Tenda F1202 V1.0BR_V1.2.0.20(408) and FH1202_V1.2.0.19_EN firmware versions. The stack overflow occurs due to improper handling of the page parameter, which can lead to arbitrary code execution.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high base score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV:N): Network-based attack, meaning it can be exploited remotely.
• Attack Complexity (AC:L): Low complexity, indicating that the attack is relatively easy to execute.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:U): The vulnerability affects the same security scope.
• Confidentiality (C:H), Integrity (I:H), and Availability (A:H): High impact on all three CIA triad components.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability over the network without needing physical access to the device.
• Malicious Input: By sending specially crafted input to the fromRouteStatic function, an attacker can trigger the stack overflow.

Exploitation Methods:

• Buffer Overflow: The attacker can send a large amount of data to the page parameter, causing the stack to overflow.
• Code Execution: The overflow can be leveraged to execute arbitrary code on the affected device, potentially leading to full system compromise.

3. Affected Systems and Software Versions

Affected Systems:

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

Software Versions:

• Firmware versions V1.2.0.20(408) and V1.2.0.19_EN

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the affected devices.
• Monitoring: Increase monitoring of network traffic to and from the affected devices to detect any suspicious activity.

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware updates provided by Tenda as soon as they are available.
• Patch Management: Implement a robust patch management process to ensure all devices are kept up-to-date.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Tenda devices. Given the critical nature of the vulnerability, it could be exploited by malicious actors to gain unauthorized access to networks, exfiltrate sensitive data, and disrupt operations. This underscores the importance of timely patching and proactive security measures to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: fromRouteStatic
• Parameter: page
• Issue: Stack overflow due to improper input validation

Exploitation Steps:

1. Identify Target: Locate the affected Tenda device on the network.
2. Craft Payload: Create a payload that exceeds the buffer size for the page parameter.
3. Send Payload: Transmit the payload to the device, triggering the stack overflow.
4. Execute Code: If successful, the attacker can execute arbitrary code on the device.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect unusual network traffic patterns indicative of exploitation attempts.
• Log Analysis: Regularly review logs for any anomalies or signs of unauthorized access.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• GitHub Report

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.