This Week in Security: Peering Through the Wall, Apple’s GoFetch, and SHA-256

The Linux command wall is a hold-over from the way Unix machines used to be used. It’s an abbreviation of Write to ALL, and it was first included in AT&T Unix, way back in 1975. wall is a tool that a sysadmin can use to send a message to the terminal session of all logged-in users. So far nothing too exciting from a security perspective. Where things get a bit more interesting is the consideration of ANSI escape codes. Those are the control codes that moves the cursor around on the screen, also inherited from the olden days of terminals.

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