this post was submitted on 20 Aug 2026
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222
AliExpress runs silent WebAudio fingerprinting that breaks Bluetooth multipoint (blog.laserphile.com)
submitted 5 days ago* (last edited 5 days ago) by inari@piefed.zip to c/technology@lemmy.world
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[–] fubarx@lemmy.world 48 points 4 days ago* (last edited 4 days ago) (1 children)

The WebAudio test is not the only measurement in these scripts. Inspection of the bundles found code that queries or measures:

  • canvas rendering and toDataURL()
  • WebGL renderer information, extensions, and shader precision
  • audio oscillator and analyser output
  • screen and viewport dimensions
  • device pixel ratio
  • hardware concurrency and device memory
  • installed browser plugins
  • supported audio and video formats
  • WebRTC behaviour
  • browser performance timing
  • mouse, touch, focus, and scroll events
  • device motion and orientation
  • properties commonly associated with browser automation

There is also code for serialising and encrypting results, making requests to Alibaba telemetry services, and sending data with fetch() or sendBeacon().

Not sure you need all this to play audio.

[–] riskable@programming.dev 7 points 4 days ago (2 children)

If it's part of a fingerprinting lib, then they just fucked it up. Because the fingerprinting can be done in one ~16ms window of time when the script runs and then you can break down the audio objects and pretend nothing happened.

[–] festus@lemmy.ca 2 points 2 days ago

Also because browsers support OfflineAudioContext, which lets you do the same things but doesn't try to output to speakers.

[–] fubarx@lemmy.world 5 points 4 days ago* (last edited 4 days ago) (1 children)

This guy fingerprints.

(hopefully in a good way)

[–] riskable@programming.dev 1 points 3 days ago

Oh gods. I leave them everywhere 🤷