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Saint CodeChism, Catechism of the PLCs
Patron of industrial controllers, ladder logic programs, and vulnerabilities named reluctantly.
Life
In August 2023 K. Reid Wightman showed that in CODESYS Control, the runtime that drives a great many PLCs, a user allowed to upload programs could abuse a buffer overflow to break out of the control logic and take over the whole device. He admitted he chose the name only because a vulnerability is supposed to have one; but it sounds like catechism, and a saint of PLCs could ask for nothing better.
Prayer
O Saint CodeChism, who teaches PLCs doctrines not found in the manual, keep our programs within the bounds of their memory. Amen.
How to celebrate
Celebrated by updating CODESYS Control per advisory 2023-04 and reciting IEC 61131-3 by heart.
Upload the program, convert the controller.