As effortless as it may be to send images to other iPhone users via AirDrop or mirror your MacBook screen on a TV using AirPlay, the Apple protocol used to enable those wireless conveyances is actually filled with security risks.
New research reveals that Apple Wireless Direct Link (AWDL), the AirDrop/AirPlay networking protocol installed on more than 1.2 billion Apple devices, leaves unknowing users susceptible to a number of cyberattacks.
Owners of Macs, iPhones, iPads, Apple watches, Apple TVs, and HomePods with AWDL installed are vulnerable to assailants attempting to track users, crash devices, or intercept AirDrop dispatches through man-in-the-middle (MitM) attacks, according to the research results.
Real-life attacks using AirDrop or AirPlay may not be immediately likely, but if you're worried, you should turn off the features on your Apple devices when you're not using them.
What you can do, how to disable AirDrop
Turning off AirDrop is pretty easy. Open Settings, tap General and tap AirDrop. Here, you'll get three options: Receiving Off (disable), Contacts Only and Everyone. The smart move is to selectively enable only when you're in private, safe areas, such as your home, with a 30-foot radius from bad actors.
If you're confused by the technical jargon, you should understand the convenience of wireless communication like AirDrop comes with a cost. Consider sending photos and files to your friends the old-fashioned way: through text, email, or literally anything with encryption.
And before you panic, know that these researchers are seasoned security experts. Joe Schmo passing you on the street (probably) won't be able to penetrate your Apple device just for the heck of it -- yet.
What does this mean?
These findings come from the Technical University of Darmstadt in Germany, where researchers sought to analyze the AWDL protocol, which Apple introduced in 2014. The full technical paper can be read here.
Five years later, Apple has yet to publish any significant details about how the networking technology included by default on all its devices works. TU Darmstadt noticed the lack of security research on AWDL and decided to take a look into the highly pervasive protocol.
"Considering the well-known rocky history of wireless protocols' security, with various flaws being repeatedly discovered in Bluetooth, WEP, WPA2, GSM, UMTS, and LTE, the lack of information regarding AWDL security is a significant concern given the increasing number of services that rely on it," the TU Darmstadt team said.
They partnered with academics from Boston's Northeastern University to reverse-engineer the protocol and test it for vulnerabilities. While Apple's ADWL contained some security features, the researchers managed to bypass them and successfully carry out staged attacks.
The researchers discovered they could intercept and modify device-to-device communication via AirDrop, permitting the injection of malicious files. They also found long-term device tracking possible, despite MAC randomization. Three denial-of-service (DoS) attacks were also completed, crashing the Apple devices tested.
Tom's Guide has reached out to Apple for comment, and we will update this story when we receive a response.
Apple might have to rebuild the technology behind AirDrop and AirPlay if it wants to protect users from these kinds of cyber attacks. While the tech giant rolled out an AWDL patch for DoS attacks in May in response to the research team's early disclosures, the overall protocol is still vulnerable to other types of attacks. The researchers say the flaws "require the redesign of some of [Apple's] services."