Have you considered the possibility that someone could be watching you through your webcam? Or Listening to all your conversations through your laptop’s microphone?
Even a bit of thought about this probability could make you feel incredibly creepy.
But most people think that they have a solution to these major issues i.e. simply covering their laptop’s webcam and microphone with tape, just like Facebook CEO Mark Zuckerberg and FBI Director James Comey.
But it’s 2016, and a piece of tape won’t help you, as a new experiment has proved that how easily hackers can turn your headphones into a microphone to spy on all your conversations in the background without your knowledge.
A group of Israeli security researchers at Ben Gurion University have created a proof-of-concept code (malware) that converts typical headphones into microphones and then use them to record all your conversations in the room just like a fully-featured spying device.
Speake(a)r Malware Weaponizes Headphones and Speakers
Using headphones as microphones is a decade-old technique. There are many videos available on YouTube, which show that earbuds can function as microphones in a pinch.
But what the researchers managed to do is switching an output channel of the audio card on your laptop — running either Windows or Mac OS — to an input signal and then recording the sound without any dedicated microphone channel from as far as 20 feet away
Dubbed “Speake(a)r,” the malicious code (malware) is disturbingly able to hijack a computer to record audio even when its microphone is disabled or completely disconnected from the computer.
“People don’t think about this privacy vulnerability,” says lead researcher Mordechai Guri told Wired. “Even if you remove your computer’s microphone, if you use headphones you can be recorded.”
Speake(a)r actually utilizes the existing headphones to capture vibrations in the air, converts them to electromagnetic signals, alters the internal functions of audio jacks, and then flips input jacks (used by microphones) to output jacks (used for speakers and headphones).
This allows a hacker to record audio, though at a lower quality, from computers with disabled or no microphone or from computers of a paranoid user, who has intentionally removed any existing audio components.
But What made this Hack Possible?
Thanks to a little-known feature of Realtek audio codec chips that actually “retask” the computer’s output channel as an input channel silently.
This makes it possible for the researchers’ malware to record audio even when the earbuds is connected into an output-only jack and do not even have a microphone channel on their plug.
What’s even worse? Since RealTek chips are being used on the majority of systems these days, the Speake(a)r attack works on practically any computer, running Windows or MacOS, and most laptops, as well, leaving most computers vulnerable to such attacks.
“This is the real vulnerability,” said Guri. “It’s what makes almost every computer today vulnerable to this type of attack.”The feature of RealTek audio codec chips is truly dangerous, as it can not be easily fixed. The only way to deal with this issue is to redesign and replace the chip in current as well as future computers, which is impractical.
According to wired
CAUTIOUS COMPUTER USERS put a piece of tape over their webcam. Truly paranoid ones worry about their devices’ microphones—some even crack open their computers and phones to disable or remove those audio components so they can’t be hijacked by hackers. Now one group of Israeli researchers has taken that game of spy-versus-spy paranoia a step further, with malware that converts your headphones into makeshift microphones that can slyly record your conversations.
Researchers at Israel’s Ben Gurion University have created a piece of proof-of-concept code they call “Speake(a)r,” designed to demonstrate how determined hackers could find a way to surreptitiously hijack a computer to record audio even when the device’s microphones have been entirely removed or disabled. The experimental malware instead repurposes the speakers in earbuds or headphones to use them as microphones, converting the vibrations in air into electromagnetic signals to clearly capture audio from across a room.
“People don’t think about this privacy vulnerability,” says Mordechai Guri, the research lead of Ben Gurion’s Cyber Security Research Labs. “Even if you remove your computer’s microphone, if you use headphones you can be recorded.”
It’s no surprise that earbuds can function as microphones in a pinch, as dozens of how-to YouTube videos demonstrate. Just as the speakers in headphones turn electromagnetic signals into sound waves through a membrane’s vibrations, those membranes can also work in reverse, picking up sound vibrations and converting them back to electromagnetic signals. (Plug a pair of mic-less headphones into an audio input jack on your computer to try it.)
But the Ben Gurion researchers took that hack a step further. Their malware uses a little-known feature of RealTek audio codec chips to silently “retask” the computer’s output channel as an input channel, allowing the malware to record audio even when the headphones remain connected into an output-only jack and don’t even have a microphone channel on their plug. The researchers say the RealTek chips are so common that the attack works on practically any desktop computer, whether it runs Windows or MacOS, and most laptops, too. RealTek didn’t immediately respond to WIRED’s request for comment on the Ben Gurion researchers’ work. “This is the real vulnerability,” says Guri. “It’s what makes almost every computer today vulnerable to this type of attack.”
To be fair, the eavesdropping attack should only matter to those who have already gone a few steps down the rabbit-hole of obsessive counter-intelligence measures. But in the modern age of cybersecurity, fears of having your computer’s mic surreptitiously activated by stealthy malware are increasingly mainstream: Guri points to the photo that revealed earlier this year that Mark Zuckerberg had put tape over his laptop’s microphone. In a video for Vice News, Edward Snowden demonstrated how to remove the internal mic from a smartphone. Even the NSA’s information assurance division suggests “hardening” PCs by disabling their microphones, and repair-oriented site iFixit’s Kyle Wiens showed MacWorld in July how to physically disable a Macbook mic. None of those techniques—short of disabling all audio input and output from a computer—would defeat this new malware. (Guri says his team has so far focused on using the vulnerability in RealTek chips to attack PCs, though. They have to determine which other audio codec chips and smartphones might be vulnerable to the attack, They have to determine which other audio codec chips and smartphones might be vulnerable to the attack, but believe other chips and devices are likely also susceptible.)
In their tests, the researchers tried the audio hack with a pair of Sennheiser headphones. They found that they could record from as far as 20 feet away—and even compress the resulting recording and send it over the internet, as a hacker would—and still distinguish the words spoken by a male voice. “It’s very effective,” says Guri. “Your headphones do make a good, quality microphone.
There’s no simple software patch for the eavesdropping attack, Guri says. The property of RealTek’s audio codec chips that allows a program to switch an output channel to an input isn’t an accidental bug so much as a dangerous feature, Guri says, and one that can’t be easily fixed without redesigning and replacing the chip in future computers.
Until then, paranoiacs take note: If determined hackers are out to bug your conversations, all your careful microphone removal surgery isn’t quite enough—you’ll also need to unplug that pair of cheap earbuds hanging around your neck.