AirTags are a popular tracking device used by anyone from forgetful key owners to those with malicious intent, such as jealous spouses and car thieves. Using AirTags for spying is simple: a tag is discreetly placed on the target to allow their movements to be conveniently monitored using Apple Find My. We’ve even added protection from AirTag-based tracking to our products for Android.

But a recent study by security researchers has surprisingly found that remote tracking doesn’t even depend on buying an AirTag or ever being physically near the target. If you manage to sneak special malware onto someone’s Windows, Android, or Linux device (like a computer or phone), it could use the device’s Bluetooth to send out a signal that nearby Apple devices would think is coming from an AirTag. Essentially, for Apple devices, the infected phone or computer effectively becomes an oversized AirTag – trackable via the Find My network, which boasts over a billion Apple phones and tablets.

Anatomy of the attack

The attack exploits two features of the Find My technology.

Firstly, this network uses end-to-end encryption – so participants don’t know whose signals they’re relaying. To exchange information, an AirTag and its owner’s phone rely on a pair of cryptographic keys. When a lost AirTag broadcasts its “callsigns” via Bluetooth, Find My network “detectors” (that is, any Apple device with Bluetooth and internet access, regardless of who owns it) simply transmit AirTag’s geolocation data to Apple servers. The data is encrypted with the lost AirTag’s public key.

Then, any device can ask for the encrypted location data from the server. And because it’s encrypted, Apple doesn’t know who the signal belongs to, or which device asked for it. The crucial point here is that one can only decrypt the data and find out both whose AirTag it is and its exact location by having the corresponding private key. Therefore, this data is only useful to the owner of the smartphone paired with this AirTag.

Another feature of Find My is that detectors don’t verify whether the location signal indeed originated with an Apple device. Any devices that support Bluetooth Low Energy (BLE) can broadcast it.

To exploit these features, the researchers came up with the following method:

1. They install malware on a computer, phone, or some other device running Android, Windows, or Linux, and check the Bluetooth adapter address.
2. The attackers’ server receives the information and uses powerful video cards to generate a pair of encryption keys specific to the device’s Bluetooth address and compatible with Apple’s Find My
3. The public key is sent back to the infected device, and the malware then starts transmitting a Bluetooth message that mimics AirTag signals and includes this key.
4. Any nearby Apple device connected to the internet receives the Bluetooth message and relays it to the Find My
5. The attackers’ server uses the private key to request the location of the infected device from Find My and decrypt the data.

How well does the tracking work?

The more Apple devices nearby and the slower the victim’s movement, the better the accuracy and speed of the location tracking. In typical urban environments like homes or offices, the location is typically pinpointed within six to seven minutes and with an accuracy of around three meters. Even in extreme situations, such as being on an airplane, tracking can still occur because internet access is now widely available on flights. The researchers obtained 17 geolocation points throughout a 90-minute flight, allowing them to reconstruct the aircraft’s flight path quite accurately.

Naturally, the success of the attack hinges on whether the victim can be infected with malware, and the details are slightly different depending on the platform. On Linux devices, the attack only requires infecting the victim’s gadget due to the specific Bluetooth implementation. By contrast, Android and Windows employ Bluetooth address randomization, meaning the attacker needs to infect two nearby Bluetooth devices: one as the tracking target (the one that mimics an AirTag), and another to obtain its adapter address.

The malicious application needs Bluetooth access, but this isn’t hard to get. Many common app categories – like media players, file sharing tools, and even payment apps – often have legitimate reasons to request it. It’s likely that a convincing and functional bait application will be created for this type of attack, or even that an existing application will be trojanized. The attack requires neither administrative permissions nor root access.

Importantly, we’re not just talking about phones and computers: the attack is effective across a range of devices – including smart TVs, virtual-reality glasses, and other household appliances – as Android and Linux are common operating systems in many of them.

Another key part of the attack involves calculating cryptographic keys on the server. Due to the complexity of this operation – which requires leasing hardware with modern video cards – the cost of generating a key for a single  victim is estimated at around $2.2. For this reason, we find mass-tracking scenarios that target, say, visitors inside a shopping center, to be unlikely. However, targeted attacks at this price point are accessible to virtually anyone, including scammers or nosy co-workers and spouses.

Apple’s response

The company patched the Find My network vulnerability in December 2024 in iOS 18.2, visionOS 2.2, iPadOS 17.7.3 (for older devices) and 18.2 (for newer ones), watchOS 11.2, tvOS 18.2, macOS Ventura 13.7.2, macOS Sonoma 14.7.2, and macOS Sequoia 15.2. Unfortunately, as is often the case with Apple, the details of the updates have not been disclosed. The researchers emphasize that this tracking method will remain technically feasible until all Apple users update to at least the above versions, though fewer devices will be able to report a tracked device’s location. And it’s not impossible that the Apple patch could be defeated by another engineering trick.

How to protect yourself from the attack

• Turn off Bluetooth when you’re not using it if your device has the option.
• When installing apps, stick to trusted sources only. Verify that the app has been around for a long time, and has many downloads and a high rating in its latest version.
• Only grant Bluetooth and location access to apps if you’re certain you need those features.
• Regularly update your device: both the OS and main apps.
• Make sure you have comprehensive malware protection enabled on all your devices. We recommend Kaspersky Premium.

Besides this rather unusual and as-yet-unseen-in-the-wild tracking method, there are numerous other ways your location and activities can be tracked. What methods are being used to spy on you? Read these for the details:

• How smartphones build a dossier on you
• Webcam stalking: fact or fiction?
• How to protect yourself from Bluetooth stalking and more
• How millions of Kia cars could be tracked
• Run for your data: privacy settings in jogging apps
• I know how you drove last summer

… and other posts.

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