Description
CL4/6NX Plus and CL4/6NX-J Plus (Japan model) with the firmware versions prior to 1.15.5-r1 allow crafted dangerous files to be uploaded. An arbitrary Lua script may be executed on the system with the root privilege.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-23818
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-23818 affects the CL4/6NX Plus and CL4/6NX-J Plus (Japan model) devices with firmware versions prior to 1.15.5-r1. This vulnerability allows for the upload of crafted dangerous files, which can lead to the execution of arbitrary Lua scripts with root privileges. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring vector CVSS:3.0/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 can be exploited remotely over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources to exploit.
- Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
- Scope (S): Unchanged (U) - The vulnerability affects the same security scope.
- Confidentiality (C): High (H) - Complete loss of confidentiality.
- Integrity (I): High (H) - Complete loss of integrity.
- Availability (A): High (H) - Complete loss of availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves uploading a crafted file to the affected device. This file can contain a malicious Lua script designed to execute with root privileges. Potential exploitation methods include:
- Remote Code Execution (RCE): An attacker can upload a specially crafted file that includes a Lua script. Upon execution, the script can perform various malicious actions such as data exfiltration, system modification, or further malware deployment.
- Privilege Escalation: Since the script runs with root privileges, an attacker can gain full control over the device, leading to further compromise of the network.
- Persistent Backdoors: The attacker can install backdoors or other persistent malware to maintain access to the device.
3. Affected Systems and Software Versions
The vulnerability affects the following systems and software versions:
- CL4/6NX Plus: Firmware versions prior to 1.15.5-r1
- CL4/6NX-J Plus (Japan model): Firmware versions prior to 1.15.5-r1
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Firmware Update: Immediately update the firmware to version 1.15.5-r1 or later. This update addresses the vulnerability and prevents the upload of crafted dangerous files.
- Network Segmentation: Implement network segmentation to isolate affected devices from critical systems and reduce the attack surface.
- Access Controls: Enforce strict access controls to limit who can upload files to the device. Use authentication and authorization mechanisms to ensure only trusted users have access.
- Monitoring and Logging: Implement robust monitoring and logging to detect any suspicious activities or unauthorized access attempts.
- Intrusion Detection/Prevention Systems (IDS/IPS): Deploy IDS/IPS to detect and prevent malicious activities targeting the vulnerability.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations using the affected devices, particularly in sectors such as manufacturing, logistics, and retail, where these devices are commonly deployed. The potential for remote code execution with root privileges can lead to severe consequences, including data breaches, operational disruptions, and financial losses. The critical nature of the vulnerability underscores the importance of timely patch management and proactive security measures to protect against such threats.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerability Identification: The vulnerability is identified as CVE-2025-22470 and is assigned by JPCERT (Japan Computer Emergency Response Team).
- Exploit Mechanism: The exploit involves uploading a crafted file that contains a Lua script. The script is executed with root privileges, allowing for full system control.
- Detection Methods: Security professionals should look for unusual file upload activities, unexpected Lua script executions, and any unauthorized access attempts. Tools such as network traffic analyzers, file integrity monitoring systems, and endpoint detection and response (EDR) solutions can aid in detection.
- Incident Response: In case of an incident, follow the incident response plan, which includes containment, eradication, and recovery. Ensure that all affected devices are updated to the latest firmware version and conduct a thorough investigation to identify the extent of the compromise.
Conclusion
The vulnerability described in EUVD-2025-23818 is critical and requires immediate attention. Organizations should prioritize firmware updates and implement robust security measures to mitigate the risk. Continuous monitoring and proactive security practices are essential to protect against such threats and maintain the integrity of the European cybersecurity landscape.