Stuxnet report IV: Worm slithers in
Given the well-secured industrial control system, it seems very unlikely a worm like Stuxnet could ever penetrate all the way to the PLCs. Yet clearly it did.
Siemens reported 22 sites that experienced infected control systems and certainly there were other sites, such as those with other vendors’ products (and would not report infections back to Siemens). The goal here is to suggest possible answers to the vexing problem of how the worm made it through to the PLCs.
Read the full-length article here.