EUVD-2023-30864

Comprehensive Technical Analysis of EUVD-2023-30864

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-30864, also known as CVE-2023-27076, is a command injection vulnerability in Tenda G103 v.1.0.0.5. This vulnerability allows an attacker to execute arbitrary code via the language parameter. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring 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 and resources.
• Privileges Required (PR): None (N) - No special privileges are needed 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 complete loss of confidentiality.
• Integrity (I): High (H) - The vulnerability results in a complete loss of integrity.
• Availability (A): High (H) - The vulnerability results in a complete loss of availability.

Given the high scores in confidentiality, integrity, and availability, this vulnerability poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through the network, specifically targeting the language parameter in the Tenda G103 router. An attacker could exploit this vulnerability by sending crafted HTTP requests to the router, injecting malicious commands that the router would execute. This could lead to:

• Remote Code Execution (RCE): Allowing the attacker to run arbitrary commands on the router.
• Data Exfiltration: Stealing sensitive information such as configuration files, credentials, and network traffic.
• Denial of Service (DoS): Disrupting the router's functionality, leading to network outages.

3. Affected Systems and Software Versions

The vulnerability specifically affects Tenda G103 routers running firmware version 1.0.0.5. It is crucial to identify all instances of this router model within the network and assess their firmware versions.

4. Recommended Mitigation Strategies

1. Firmware Update: Immediately update the firmware of affected Tenda G103 routers to the latest version provided by the vendor.
2. Network Segmentation: Isolate the router from critical network segments to limit the potential impact of an exploit.
3. Access Control: Implement strict access controls to restrict who can access the router's management interface.
4. Monitoring and Logging: Enable comprehensive logging and monitoring to detect any suspicious activities or unauthorized access attempts.
5. Intrusion Detection Systems (IDS): Deploy IDS to identify and alert on any unusual network traffic patterns that may indicate an exploitation attempt.

5. Impact on European Cybersecurity Landscape

The presence of this vulnerability in a widely used consumer router model underscores the importance of securing IoT devices. Given the critical nature of the vulnerability, it poses a significant risk to both individual users and organizations within the European Union. The potential for widespread exploitation could lead to data breaches, network disruptions, and other cybersecurity incidents, highlighting the need for robust cybersecurity measures and regular updates.

6. Technical Details for Security Professionals

• Vulnerability Type: Command Injection
• Affected Parameter: Language parameter in HTTP requests
• Exploitation Method: Crafted HTTP requests injecting malicious commands
• Detection: Monitor for unusual HTTP requests targeting the language parameter and any unexpected command execution on the router.
• Mitigation: Ensure firmware updates are applied and implement network security best practices.

For further technical details and exploitation scripts, refer to the provided GitHub link: GitHub Reference.

Conclusion

EUVD-2023-30864 is a critical command injection vulnerability in Tenda G103 routers that requires immediate attention. Organizations and individuals should prioritize updating their firmware and implementing robust security measures to mitigate the risk. The European cybersecurity landscape must continue to emphasize the importance of securing IoT devices to prevent such vulnerabilities from being exploited.