Manufacturer Controls Third-Party Maintenance Access to Production Line PLCs
Zero
Standing third-party connections
The Problem
Manufacturing facilities grant third-party maintenance providers persistent remote access to PLCs and HMIs for support and updates. These standing connections create permanent attack paths from external networks directly into the production environment at Purdue Levels 0-1.
The Scenario
A third-party maintenance provider's VPN credentials were compromised in a supply-chain attack. The attackers gained access to PLC programming interfaces across multiple customer sites. Facilities with standing connections were immediately at risk of production manipulation.
The Protection
- Physical disconnection of maintenance access paths when not in scheduled use
- PLC programmes and ladder logic stored in offline vault between maintenance windows
- Configuration baselines verified against offline copies before reconnection
- Complete audit trail of all connection and disconnection events
The Outcome
Zero Standing third-party connections
When the supply-chain compromise was disclosed, this manufacturer confirmed zero exposure within minutes. No standing connections existed. PLC programmes were verified against offline baselines. Production continued without interruption while other facilities faced weeks of forensic investigation.
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