RECENTLY, HACKERS MANAGED to drain bank accounts across Germany. They did so not by hacking the banks themselves, but by exploiting a long-known flaw in a global telephony protocol known as Signaling System 7. It’s the kind of attack that researchers have warned about for years—and may finally be the one the gets the telecom industry to clean up its giant SS7 mess.

https://www.wired.com/2017/05/fix-ss7-two-factor-authentication-bank-accounts/?mbid=social_fb