EUVD-2023-36272

Comprehensive Technical Analysis of EUVD-2023-36272

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-36272, also known as CVE-2023-31983, is a Command Injection vulnerability in the Edimax Wireless Router N300 Firmware BR-6428NS_v4. This vulnerability allows an attacker to execute arbitrary code via the mp function in /bin/webs without any limitations. 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 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 results in a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability results in a high impact on integrity.
• Availability (A): High (H) - The vulnerability results in a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is network-based. An attacker can exploit this vulnerability by sending crafted HTTP requests to the router's web interface, specifically targeting the mp function in /bin/webs. This can be achieved through various methods, including:

• Direct Network Access: If the router is exposed to the internet, an attacker can directly send malicious requests.
• Local Network Access: An attacker with access to the local network can exploit the vulnerability.
• Phishing and Social Engineering: Tricking users into visiting malicious websites that send crafted requests to the router.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Edimax Wireless Router N300 with firmware version BR-6428NS_v4. Other versions of the firmware or different models of Edimax routers may also be affected, but this has not been confirmed.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Immediately update the router firmware to the latest version provided by Edimax. Ensure that the update addresses the command injection vulnerability.
• Network Segmentation: Isolate the router from the internet and restrict access to trusted devices only.
• Firewall Configuration: Implement strict firewall rules to limit access to the router's web interface.
• Monitoring and Logging: Enable logging and monitoring to detect any suspicious activity targeting the router.
• User Education: Educate users about the risks of phishing and social engineering attacks.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for individuals and organizations using the affected Edimax routers. The high severity score and the ease of exploitation make it a prime target for cybercriminals. Successful exploitation can lead to unauthorized access, data breaches, and disruption of network services, impacting both confidentiality and availability.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Exploitation Details: The vulnerability is exploited by injecting malicious commands into the mp function in /bin/webs. This can be achieved by crafting HTTP requests that include command injection payloads.
• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for suspicious network traffic targeting the router's web interface.
• Response: In case of a suspected exploitation, isolate the affected router immediately and perform a thorough investigation. Ensure that all logs are preserved for forensic analysis.
• Patch Management: Regularly check for firmware updates from Edimax and apply them promptly. Ensure that all network devices are included in the patch management process.

Conclusion

EUVD-2023-36272 is a critical vulnerability that requires immediate attention from cybersecurity professionals. By understanding the technical details and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.

References

• GitHub Repository
• Mitre CVE Database
• ENISA Vulnerability Database