EUVD-2023-29194

Comprehensive Technical Analysis of EUVD-2023-29194

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-29194, also known as CVE-2023-25231, pertains to a Buffer Overflow in the Tenda Router W30E V1.0.1.25(633). The affected function is fromRouteStatic, and the vulnerability is triggered via the parameters entrys and mitInterface.

Severity Evaluation:

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

The CVSS score of 9.8 indicates a critical vulnerability. The vector string breaks down as follows:

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

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the AV:N vector, attackers can exploit this vulnerability remotely over the network.
• Low Complexity: The AC:L vector indicates that the attack does not require sophisticated techniques, making it accessible to a wide range of attackers.

Exploitation Methods:

• Buffer Overflow: Attackers can send specially crafted packets to the router, causing a buffer overflow in the fromRouteStatic function. This can lead to arbitrary code execution, denial of service (DoS), or other malicious activities.
• Parameter Manipulation: The parameters entrys and mitInterface are the entry points for the attack. Manipulating these parameters can trigger the buffer overflow.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda Router W30E

Affected Software Versions:

• Version V1.0.1.25(633)

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Ensure that the router firmware is updated to the latest version that addresses this vulnerability.
• Network Segmentation: Isolate the router from critical networks to limit the potential impact of an attack.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
• User Education: Educate users on the importance of updating firmware and the risks associated with outdated devices.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly for organizations and individuals using Tenda routers. The high CVSS score indicates that successful exploitation could lead to severe consequences, including data breaches, service disruptions, and potential entry points for further attacks within the network.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: fromRouteStatic
• Parameters: entrys, mitInterface
• Exploit Type: Buffer Overflow

References:

• GitHub Repository

Additional Information:

• Assigner: Mitre
• EPSS: N/A
• ENISA ID Product: [{"id":"ce2e9623-22ef-3f75-aceb-3fa804e5a3fc","product":{"name":"n/a"},"product_version":"n/a"}]
• ENISA ID Vendor: [{"id":"c610eba3-1f9b-3e79-aa7e-5fcee380ded0","vendor":{"name":"n/a"}}]

Conclusion: This vulnerability highlights the importance of timely updates and proactive security measures. Organizations should prioritize patching affected devices and implementing robust security controls to mitigate the risk of exploitation.