OT Cybersecurity Best Practices for SMBs: Transferring Files to an OT Environment
Summary: Dragos OT-CERT's monthly SMB guidance notes that during assessments consultants often find no company-approved file transfer policy, with USB drives used as common practice and little regard for a drive's ownership history, contents, or last virus scan. The recommended configuration uses at least three file transfer servers - one each for corporate, DMZ, and OT zones - with patched, anti-malware-equipped systems, two firewalls, optional IDS/IPS, and logging across all assets, and it cites Stuxnet as the prime example of why a written and enforced data transfer policy is needed.
Bottom line: The guidance warns that a single asset must never bridge trust zones and that the three-server requirement should not be reduced to two or fewer, because a low-trust zone communicating directly with a high-trust zone is the exposure Stuxnet demonstrated.
Read the original at Dragos Blog ↗
- Topics
- OT / ICS & Critical Infrastructure
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