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Security Advisories

SUMMARY

Security Enhancement: SSH Known Hard Coded Private Keys

The product is running a service that is using a publicly known SSH private key. An attacker may use this key to decrypt intercepted traffic between users and the device. A remote attacker can also perform a man-in-the-middle attack in order to gain access to the system or modify data in transit. 

(Source: Tenable Nessus)

 

To enhance the security of the product, users should implement appropriate mitigations or solutions to avoid potential security issue.

AFFECTED PRODUCTS AND SOLUTIONS

Solutions

Moxa has developed appropriate solutions to enhance the security. The solutions for the affected products are listed in the following table: 

Product Series Affected Versions Solutions
TRC-2190 Series v1.1 and earlier  Please contact Moxa Technical Support for the security patch (v1.1.7)

 

Mitigations

To mitigate the risk, we recommend the following actions:

  • Refer to the General Security Recommendations section to further strengthen your security context.

 

General Security Recommendations

To safeguard devices and networks, we recommend implementing the following recommendations to mitigate potential risks:

  1. Restrict Network Access
    • Use firewalls or access control lists (ACLs) to limit communication to trusted IP addresses and networks.
    • Segregate operational networks from other networks (e.g., enterprise networks) using VLANs or physical separation.
  2. Minimize Exposure
    • Avoid exposing devices directly to the Internet.
    • Disable unused network services and ports to reduce the attack surface.
  3. Enhance Device Authentication and Access Control
    • Implement multi-factor authentication (MFA) for accessing critical systems.
    • Use role-based access control (RBAC) to enforce the principle of least privilege.
  4. Regularly Update Firmware and Software
    • Keep devices updated with the latest firmware versions and security patches.
    • Establish a regular patch management schedule to address newly identified vulnerabilities.
  5. Secure Remote Access
    • Use encrypted communication protocols (e.g., VPN, SSH) for remote access.
    • Restrict remote access to authorized personnel only and enforce strong authentication mechanisms.
  6. Implement Anomaly Detection Techniques
    • Monitor network traffic and device behavior for unusual or unauthorized activities.
    • Use tools or techniques that can identify anomalies and provide alerts for potential threats.
  7. Implement Logging and Monitoring
    • Enable event logging and maintain audit trails on devices.
    • Regularly review logs for anomalies and unauthorized access attempts.
  8. Conduct Regular Security Assessments
    • Perform vulnerability assessments to identify potential risks.
    • Regularly review device configurations to ensure compliance with security policies.

 

Revision History:

VERSION DESCRIPTION RELEASE DATE
1.0 First release October 9, 2025

Relevant Products

TRC-2190 Series ·

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If you are concerned about a potential cybersecurity vulnerability, please contact us and one of technical support staff will get in touch with you.

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