Security researchers have discovered a way to flip an output channel on onboard Realtec audio into an input channel, thus turning your headphones into an unpowered microphone. The ability of a speaker or headphone to be used as a microphone is not news to anyone who has played around with headphones or input jacks, but it is possible some readers had deprived childhoods and have never tried this. While you cannot mitigate this vulnerability permanently you could certainly notice it as your headphones would no longer play audio if the port is configured as input.
Drop by Slashdot a link, and if you have never tried this out before you really should find an old pair of headphones and experiment with ports as well as snipping off one side of a pair of earbuds. One supposes iPhone 7 users need not worry.
"In short, the headphones were nearly as good as an unpowered microphone at picking up audio in a room. It essentially "retasks" the RealTek audio codec chip output found in many desktop computers into an input channel. This means you can plug your headphones into a seemingly output-only jack and hackers can still listen in. This isn't a driver fix, either."
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