EUVD-2023-36274

Comprehensive Technical Analysis of EUVD-2023-36274

1. Vulnerability Assessment and Severity Evaluation

The EUVD entry EUVD-2023-36274 describes 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 formAccept 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:

• AV:N (Attack Vector: Network): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low): The attack requires low complexity to exploit.
• 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): The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High): The vulnerability has a high impact on integrity.
• A:H (Availability: High): The vulnerability has a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through network access. An attacker can exploit the formAccept function in the /bin/webs binary by injecting malicious commands. This can be achieved by crafting a specially designed HTTP request that includes the injected commands. The attacker does not need any special privileges or user interaction to exploit this vulnerability.

Potential exploitation methods include:

• Remote Code Execution (RCE): By injecting commands, an attacker can execute arbitrary code on the affected device.
• Data Exfiltration: The attacker can extract sensitive information from the device.
• Denial of Service (DoS): The attacker can disrupt the normal operation of the device, leading to a denial of service.

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 in the provided entry.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following strategies are recommended:

• Firmware Update: Ensure that the router firmware is updated to the latest version provided by Edimax. If a patch is available, apply it immediately.
• Network Segmentation: Isolate the router from critical network segments to limit the potential impact of an exploit.
• Access Control: Implement strict access controls to limit who can access the router's management interface.
• Firewall Rules: Configure firewall rules to restrict access to the router's management interface from untrusted networks.
• Monitoring and Logging: Enable logging and monitoring to detect any suspicious activity related to the router.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of wireless routers in both residential and business environments. The high severity score and the potential for remote code execution make this vulnerability a critical concern. Organizations and individuals using the affected Edimax routers are at risk of data breaches, service disruptions, and potential compromise of network integrity.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The formAccept function in the /bin/webs binary is the point of vulnerability.
• Exploitation: The vulnerability can be exploited by injecting commands through HTTP requests. This can be done using tools like curl or custom scripts.
• Detection: Monitor network traffic for unusual HTTP requests targeting the router's management interface. Look for patterns indicative of command injection attempts.
• Response: In case of detection, isolate the affected router immediately and apply the latest firmware update. Conduct a thorough investigation to determine the extent of the compromise.

Conclusion

The Command Injection vulnerability in the Edimax Wireless Router N300 Firmware BR-6428NS_v4 is a critical issue that requires immediate attention. Organizations and individuals should prioritize updating their firmware and implementing robust security measures to mitigate the risk. Continuous monitoring and vigilance are essential to protect against potential exploits and ensure the integrity of networked devices.

References

• GitHub Repository
• Aliases: CVE-2023-31985, GSD-2023-31985
• Assigner: Mitre
• EPSS: 4
• ENISA ID Product: [{"id":"8f904984-80bf-3a52-bf7c-d19e98c3b949","product":{"name":"n/a"},"product_version":"n/a"}]
• ENISA ID Vendor: [{"id":"bf375fda-c3c3-3c9f-9365-83b206330b03","vendor":{"name":"n/a"}}]