EUVD-2024-28547

Comprehensive Technical Analysis of EUVD-2024-28547

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The Tenda FH1205 v2.0.0.7(775) firmware contains a stack overflow vulnerability in the fromAddressNat function, specifically in the handling of the page parameter. This vulnerability can be exploited to execute arbitrary code, leading to potential unauthorized access, data breaches, and system compromise.

Severity Evaluation: The vulnerability has a CVSS (Common Vulnerability Scoring System) base score of 9.8, which is categorized 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:N): Network-based attack.
• Attack Complexity (AC:L): Low complexity required to exploit.
• Privileges Required (PR:N): No privileges required.
• User Interaction (UI:N): No user interaction required.
• Scope (S:U): Unchanged.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

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 Payloads: Crafted packets or requests can be sent to the device to trigger the stack overflow, leading to code execution.

Exploitation Methods:

• Buffer Overflow: By sending a specially crafted request with a large page parameter, an attacker can overwrite the stack and inject malicious code.
• Code Execution: Once the stack is overwritten, the attacker can execute arbitrary code, potentially gaining control over the device.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda FH1205 devices running firmware version v2.0.0.7(775).

Software Versions:

• Specifically, the vulnerability is present in the fromAddressNat function of the affected firmware version.

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 device.
• Monitoring: Increase monitoring and logging for suspicious activities on the network.

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.
• Security Audits: Conduct regular security audits and vulnerability assessments on IoT devices.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• GDPR: Potential data breaches could lead to violations of GDPR, resulting in significant fines and legal consequences.
• NIS Directive: Organizations must comply with the Network and Information Systems (NIS) Directive, ensuring robust cybersecurity measures are in place.

Economic Impact:

• Financial Losses: Data breaches and system compromises can result in financial losses, including direct costs and reputational damage.
• Operational Disruption: Compromised devices can lead to operational disruptions, affecting business continuity.

Public Trust:

• Consumer Confidence: Incidents involving IoT devices can erode consumer confidence in smart home technologies and connected devices.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: fromAddressNat
• Parameter Affected: page
• Vulnerability Type: Stack overflow

Exploitation Steps:

1. Identify Target: Locate the Tenda FH1205 device on the network.
2. Craft Payload: Create a malicious request with an oversized page parameter.
3. Send Request: Transmit the crafted request to the device.
4. Execute Code: Overwrite the stack and execute arbitrary code.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect unusual network traffic patterns.
• Incident Response Plan: Develop and implement an incident response plan tailored to IoT devices.
• Forensic Analysis: Conduct forensic analysis to understand the scope and impact of any successful exploitation.

References:

• GitHub Repository: IoT-vulnerable/Tenda/FH/FH1205/fromAddressNat_page.md

By addressing this vulnerability promptly and effectively, organizations can mitigate the risks associated with the stack overflow in the Tenda FH1205 device, ensuring the security and integrity of their networks and data.