EUVD-2024-35119

Comprehensive Technical Analysis of EUVD-2024-35119

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The Tenda FH1206 V1.2.0.8(8155)_EN firmware contains a stack-based buffer overflow vulnerability. This vulnerability is triggered via the page parameter in the ip/goform/NatStaticSetting endpoint.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.8, which is classified as critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
• Privileges Required (PR): None (N) - No special privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability can result in a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability can result in a high impact on integrity.
• Availability (A): High (H) - The vulnerability can result in a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability remotely over the network.
• Buffer Overflow: The attacker can send a specially crafted request to the ip/goform/NatStaticSetting endpoint with a malicious page parameter, causing a stack-based buffer overflow.

Exploitation Methods:

• Code Execution: The buffer overflow can lead to arbitrary code execution, allowing the attacker to run malicious code on the affected device.
• Denial of Service (DoS): The attacker can cause the device to crash or become unresponsive, leading to a denial of service.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda FH1206 devices running firmware version V1.2.0.8(8155)_EN.

Software Versions:

• Specifically, the vulnerability affects Tenda FH1206 V1.2.0.8(8155)_EN.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact.
• Firewall Rules: Implement strict firewall rules to restrict access to the ip/goform/NatStaticSetting endpoint.
• Monitoring: Increase monitoring of network traffic to detect any suspicious activity targeting the vulnerable endpoint.

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 timely updates and patches.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Widespread Deployment: Tenda devices are widely used in both residential and small business environments. A critical vulnerability in these devices can have a significant impact on the overall cybersecurity posture of European networks.
• Supply Chain Risks: The vulnerability highlights the risks associated with supply chain security, as compromised devices can be used as entry points for larger attacks.
• Regulatory Compliance: Organizations must ensure compliance with relevant regulations and standards, such as GDPR, to protect sensitive data and maintain trust.

6. Technical Details for Security Professionals

Technical Analysis:

• Vulnerability Type: Stack-based buffer overflow.
• Affected Endpoint: ip/goform/NatStaticSetting.
• Parameter: page.
• Exploitation: The vulnerability can be exploited by sending a crafted HTTP request with a malicious page parameter, leading to a buffer overflow and potential code execution.

Detection and Response:

• Intrusion Detection Systems (IDS): Implement IDS rules to detect suspicious traffic targeting the ip/goform/NatStaticSetting endpoint.
• Log Analysis: Analyze logs for any unusual activity or patterns that may indicate an attempted exploitation.
• Incident Response: Develop and maintain an incident response plan to quickly address any detected exploitation attempts.

References:

• EUVD Entry: EUVD-2024-35119
• CVE ID: CVE-2024-34943

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2024-35119 and enhance their overall cybersecurity posture.