EUVD-2025-6002

Comprehensive Technical Analysis of EUVD-2025-6002

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-6002 is a command injection flaw affecting Tuoshi/Dionlink LT15D 4G Wi-Fi devices through firmware version M7628NNxlSPv2xUI_v1.0.1802.10.08_P4 and LT21B devices through M7628xUSAxUIv2_v1.0.1481.15.02_P0. This vulnerability allows an unauthenticated remote attacker to execute arbitrary OS commands with root privileges via the /goform/formJsonAjaxReq endpoint, which fails to sanitize shell metacharacters sent via JSON parameters.

Severity Evaluation:

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

The high CVSS score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV:N): Network access is required.
• Attack Complexity (AC:L): Low complexity, meaning the attack is relatively easy to execute.
• Privileges Required (PR:N): No privileges are required, making it accessible to any attacker.
• User Interaction (UI:N): No user interaction is needed.
• Scope (S:U): The vulnerability affects the entire system.
• Confidentiality (C:H), Integrity (I:H), and Availability (A:H): High impact on all three CIA triad components.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Access: An attacker can exploit this vulnerability without needing any credentials.
• Network Access: The attacker needs network access to the vulnerable device.

Exploitation Methods:

• Command Injection: The attacker can send specially crafted JSON parameters to the /goform/formJsonAjaxReq endpoint, which will execute arbitrary OS commands with root privileges.
• Automated Scripts: Attackers can use automated scripts to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Devices:

• Tuoshi/Dionlink LT15D 4G Wi-Fi devices with firmware version M7628NNxlSPv2xUI_v1.0.1802.10.08_P4.
• Tuoshi/Dionlink LT21B devices with firmware version M7628xUSAxUIv2_v1.0.1481.15.02_P0.

Software Versions:

• M7628NNxlSPv2xUI_v1.0.1802.10.08_P4
• M7628xUSAxUIv2_v1.0.1481.15.02_P0

4. Recommended Mitigation Strategies

Immediate Actions:

• Network Segmentation: Isolate vulnerable devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the /goform/formJsonAjaxReq endpoint.
• Monitoring: Increase monitoring of network traffic to detect any suspicious activities.

Long-Term Solutions:

• Firmware Update: Apply the latest firmware updates provided by the vendor as soon as they are available.
• Input Validation: Ensure that all input parameters are properly sanitized and validated.
• Access Control: Implement strong access control mechanisms to restrict unauthorized access.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected Tuoshi/Dionlink devices. The potential for unauthenticated remote command execution with root privileges can lead to:

• Data Breaches: Unauthorized access to sensitive information.
• System Compromise: Complete takeover of affected devices.
• Service Disruption: Potential denial-of-service attacks.

Given the widespread use of Wi-Fi devices, this vulnerability could impact a broad range of sectors, including residential, commercial, and industrial environments.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /goform/formJsonAjaxReq
• Parameter: JSON parameters sent to the endpoint.
• Exploitation: The endpoint fails to sanitize shell metacharacters, allowing for command injection.

Detection Methods:

• Log Analysis: Monitor logs for unusual command execution patterns.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network activities.

Mitigation Steps:

• Patch Management: Ensure that all devices are updated with the latest firmware.
• Security Audits: Conduct regular security audits to identify and mitigate similar vulnerabilities.
• User Education: Educate users on the importance of updating firmware and maintaining strong security practices.

References:

• NVD Entry
• Whitepaper
• Exploit Demonstration

By addressing this vulnerability promptly and effectively, organizations can significantly reduce the risk of exploitation and protect their networks from potential cyber threats.