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Navigating MCGS HMI Password Protection: A Guide to Recovery and Best Practices

Write-up: Implementing Password Security and User Levels on MCGS HMIs

1. Introduction

MCGS (Monitor and Control Generated System) Embedded HMI software (often used with Weinview, Kinco, and other compatible panels) provides a robust, built-in security framework. Unlike PLC-based logic locks, MCGS utilizes a User Level and Password Database system to restrict access to specific graphics, objects, buttons, or data entries. mcgs hmi password work

MCGS HMI Password Management Report This report outlines the procedures for managing user access and passwords within the MCGS (Kunlun Tongtai) HMI environment. Proper password configuration is essential for protecting operational controls and preventing unauthorized project modifications. 1. User Level and Password Configuration Navigating MCGS HMI Password Protection: A Guide to

• Enforce strong password policy: Configure and enforce minimum length, complexity, and expiration where supported. Treat default accounts as disabled until explicitly configured.
• Centralize identity where possible: If your environment supports it, integrate HMI authentication with enterprise SSO/AD/LDAP to centralize account lifecycle management and revoke access centrally. If MCGS version lacks integration, manage project accounts rigorously and document additions/removals.
• Protect project files: Store project backups and deployment packages in access-controlled, encrypted repositories. Use file-system permissions and secure backup practices to prevent leaks.
• Use network security: Segment HMI/SCADA networks from corporate networks using firewalls and VLANs, enforce secure communication (TLS) for client-server links where supported, and disable unneeded network services.
• Avoid shared accounts: Assign individual user accounts; never share engineer or administrator passwords. Where sharing is unavoidable for legacy reasons, record usage and rotate credentials frequently.
• Harden runtime stations: Implement workstation hardening (OS patches, anti-malware, remove unnecessary software), screen locking, and physical access controls to HMI stations.
• Improve logging and monitoring: Augment MCGS logs with PLC/historian/trend data to correlate operator actions with process changes. Forward logs to a centralized SIEM where possible.
• Employ privilege separation: Limit engineering access only to dedicated engineering stations with stricter controls; operator stations should have the minimal set of permissions required for daily tasks.
• Regularly audit accounts: Conduct periodic reviews of user accounts, permissions, and password hygiene. Remove orphan accounts promptly.