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50% Positive

Analyzed from 2534 words in the discussion.

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#app#audio#aliexpress#using#more#website#apps#permission#fake#play

Discussion (93 Comments)Read Original on HackerNews

mgerdtsabout 1 hour ago
With my previous hearing aid I noticed that visiting a wide variety of web sites would cause a change in the amplification of environmental noise. I always assumed it was doing something with Bluetooth, and probably not for a good reason. This is with an iPhone 13 and one Kirkland/phonak hearing aid.

I haven’t noticed this recently, but I also now have two newer Phonak hearing aids and a few iOS updates have happened. Maybe the silent Bluetooth shenanigans are less disruptive to my new aids or the programming is different. Surely shenanigans continue.

patspamabout 3 hours ago
I noticed in the last few weeks that if I’d recently opened the AliExpress iOS app (ie. it was backgrounded) my car audio would freak out thinking I was giving it an audio command. Killing the AliExpress app immediately fixed the problem. After seeing it happen more than once I assumed it was something dodgey and uninstalled the app.
lukeifyabout 3 hours ago
I cannot ever imagine installing something like AliExpress as an app.
ivanjermakov44 minutes ago
Not sure if they still do, but a couple years ago prices in app were lower than on the website. And they promoted installing it to save money.
coldtea2 minutes ago
And someone would install random apps to save $5 on $100 purchases?
wongarsu8 minutes ago
I believe the prices are the same. But the app has a number of "games" to collect tokens that get credited as discounts. Seems to be mostly stuff designed to get you to open the app daily and browse their offers. Which might be "innocent" if it's just to get you to buy more stuff, or maybe they have more reasons they want you to have the app open. Who knows

At least Aliexpress doesn't have all the fake slot machine type games that temu has that always end in variations of "get $200 of discounts if you order x items from this list"

ahofmann5 minutes ago
Now we know why...
rigrassm27 minutes ago
> Not sure if they still do, but a couple years ago prices in app were lower than on the website. And they promoted installing it to save money.

Translation: They are able to mine your personal data more completely with an app installed vs the website which they can sell for pure profit. They promoted installing it to extract more value from you.

unixheroabout 3 hours ago
It's great for shopping. But in the US you have amazon prime. We don't.
dogman1050about 2 hours ago
I have Prime, but I can't imagine installing the Amazon app either. The website works just fine.
embedding-shapeabout 2 hours ago
I don't have Amazon Prime (nor am I in the US) yet use Aliexpress perfectly fine on my mobile phone without using an app. Frankly, I don't understand how the two is related at all?
fragmedeabout 2 hours ago
Where is "we"?
lovestoryabout 2 hours ago
You probably buy things off amazon that are dropshipped from AliExpress all the time. Stop with the elitism
63stackabout 2 hours ago
This is not about the products that are shipped, but the app itself. I would caution people to never install it as well.
mark_somethingabout 1 hour ago
On AliExpress I see things like 64 TB (no, not GB!) USB flash drives for less than 10 euro, obviously a scam. I also see less spectacular products but still good looking deals, but without a brand name so you can't search the web for reviews.

On Amazon I never see products like that. That's why I prefer Amazon (and Coolblue and bol.com in Belgium).

prartichoke7 minutes ago
I cannot imagine installing amazon as an App as well. It's a website
aureateabout 2 hours ago
I buy directly from AliExpress all the time. I wouldn't install their app.
somehnguy39 minutes ago
Having bought many things off AliExpress over the years I can say with complete confidence that I've never made a purchase on Amazon that was dropshipped from Ali. The shipping times are far different and it would be immediately obvious.
ohyoutravelabout 2 hours ago
Love Temu and AliExpress for specialized components at dirt cheap prices. I would never, ever install their app. Ever, security nightmare.

Similar to how I use Amazon Prime but would never order something I ingest, put on my skin, or (usually) wear from it.

Not elitest.

ngl999about 3 hours ago
It's known that some Chinese mobile apps employ this trick to keep the app alive in the background, the rumor is that this way the 'active user' KPI can be better met.

edit: quantity qualifier

echoangleabout 1 hour ago
Why would they manipulate the numbers that way if it’s self-reported anyways? If you want to fake the numbers, couldn’t you just change the number and be done?
genidoi41 minutes ago
It's probably quite difficult to manipulate per-user metrics after the data is collected.
SirFattyabout 2 hours ago
If it's known, are you suggesting that Apple and Google are complacent in allowing these type of apps in their ecosystem?
ngl999about 1 hour ago
I wouldn't think of giant organizations like Apple and Google as mere individuals that can exercise human emotions such as complacency.
miki123211about 1 hour ago
Ah, so that's what Wolt (Doordash but in Europe) is doing.

I noticed that Voice Over (iOS screen reader) crackles and randomly changes volume when using the app, but I attributed it to standard iOS weirdness, and possibly misuse of some iOS API. Now I'm thinking that this may very well be fingerprinting.

forestry28 minutes ago
So Apple will remove them from the App Store. Thats their whole argument for their closed system - they’ll protect users from malicious apps. Right?
agos26 minutes ago
it's not the app that it's malicious, it's the website
compsciphdabout 3 hours ago
i'd argue that perhaps the ability to play audio should be permission gated, much like the ability to use webcam/microphone.

However, I'd bet that many people will gladly allow aliexpress to play audio as there are probably videos on the site that people want to play and listen to.

With that said, its possible that this can be only a use once permission. Even if I want to shop at aliexpress if I know they are doing this, I'll be more willing to be bothered every time I want to play a video with audio to approve it if this bothers me.

rcruzeiroabout 2 hours ago
I would actually love if I could have iOS prompt me to allow certain apps to use the speakers. I hate using an app and suddenly have a video autoplay loudly.
emctechabout 3 hours ago
The ability to play audio can usually be permission gated with tab muting, however the methods aliexpress use bypass that mechanism completely.
y-curiousabout 1 hour ago
This is the part you should be highlighting aggressively. That’s very uncomfortable
gmueckl29 minutes ago
A part of me is always smiling a little inside when people find creative ways to abuse browsers. It's always one more demonstration that the current web is fundamentally broken by design. The distinction between web browsers and random programs that allow remore arbitrary code execution is becoming more and more academic with every new feature that gets exposed to JavaScript.

Of course, I am also a horrible hypocrite and will actually use websites that use features like WebUSB or WebRTC.

robtherobberabout 4 hours ago
Concerning situation, I think. And I suspect (perhaps wrongly) that there are even more reasons for concern with technology that can track, capture, leak etc. information that's more sensitive or valuable, depending on how one wishes to look at it. Mobile phones, computers, routers etc. -- all have the potential to siphon out valuable information to a bad actor, especially when it comes to espionage, military, commercial etc. This has already happened at a significant scael, so it's not a remote scenario.

At the very least, governments and institutions should develop a framework to investigate all acquired technology. The community / civil society could also create something similar, a script that would analyse at a deep level everything that can be analysed with a piece of software even by a complete novice.

emctechabout 4 hours ago
Yes, I find it concerning too. I particularly dislike that windows was not aware, nor could it stop the audio stream from effecting the hardware. What other side channels like that exist? Perhaps I can be blamed for using windows
robtherobberabout 3 hours ago
> Perhaps I can be blamed for using windows

That would be unreasonable, I argue. No one should have to worry about the security of their devices and data privacy based on which OS they use. Whilst it can be argued that different OSs serve different needs, privacy and security should not be debatable. In fact, most countries have dedicated legislation for this; whether it's just, applied correctly, or serves the public before any other party are indeed discussions to be had.

lnsruabout 3 hours ago
I am pretty sure my phone is listening. The ads I see this week are about topics I discussed last week. Week for week. Stupid thing is that I need the phone to have near by as self-employed electrician. Clients want to communicate after regular office hours. Since the phone is rigged why computer shouldn’t?
bobimabout 3 hours ago
We take everything we have, freedom, privacy, free speech, for granted. The reality seems to be that these concepts are fungible and that we have to be ready to fight for them. Instead we trade these for convenience, and it's very very sad.
emctechabout 4 hours ago
Recently I ran into a problem with my Bluetooth headphones. They support multipoint bluetooth audio, so they can be connected to my PC and phone at the same time. Opening the Aliexpress webpage causes a silent audio stream keeping the PC>headphone link active blocking my phone audio. An investigation reveals obfuscated code running device fingerprinting with a side effect being a silent audio stream that firefox, chrome and windows does not recognise but which kept the bluetooth connection active.
maximilianthe1about 1 hour ago
Is this an AI summary of the article?
emctechabout 1 hour ago
No, I took the first sentence of my article and then edited the rest of the intro + conclusion to keep it short for HN.
pyaambabout 1 hour ago
Need to rethink the system that allows for (and encourages) this kind of plausible deniability. From "Oh we need this permission for [non essential feature] and you need to accept it if you want the app at all" -> to giving the user ultimate control over what happens on their personal device. Virtualize what the app can see and use fake data/identifiers/devices if necessary to get it to do what its supposed to. If the App isn't going to act in good faith why should the user? Fine grained permissions don't really work in practice because the app can keep annoying the user until they give in and hit Allow.
pyaamb23 minutes ago
Also perhaps AI agents are now capable enough to run these apps the way the user would and recognize these dark patterns. Flag those and feed it back to a warning at the point of sale that users can upvote there to signal their disapproval and a threshold score that risks removal of the app from the store. Because bad behaviour continues to make business sense if the rules allow it. Moreover, it penalizes and puts pressure on the good actors as a "missed business opportunity".
ajrossabout 1 hour ago
What you want is basically how it works. On both phone platforms and PWAs, all permissions are visible to the user explicitly. All of them can be revoked at any time. Apps are disallowed from requesting an already-denied permission.

Obviously apps can tell if they haven't been granted a permission (even if you tried to fake this, they aren't dummies and will know if it's not working), and obviously third party software isn't under any obligation to work without them.

But the platforms have done what the platforms can do, at the architecture side, really. The next stage is human-audited enforcement of malware, which this AliExpress nonsense might hopefully run afoul of.

drdexebtjl42 minutes ago
>Obviously apps can tell if they haven't been granted a permission

By design. This doesn’t need to be the case. It should be impossible to tell you have denied a permission.

In TFA’s case, the browser could just keep processing audio but never hook it up to a real audio sink.

victorbjorklund17 minutes ago
Soundd like a nightmare to build legitimate apps if you for example are building an app that uses the camera but you can’t in anyway tell that using the camera fails (because user had denied the permission 6 months ago and has no memory of it) and instead of being able to give a helpful error you are just ending up with I am guessing fake images (maybe just a black screen).
ajross22 minutes ago
That does nothing but start an arms race. Fine, audio "works" but do you get noise? Can you read back the sounds you play? No, right? It doesn't work, QED. Now the platform needs to fake the noise.

Likewise for any other hardware access you want, and most of them are harder. How do you fake local storage without storing anything? How do you fake Bluetooth access without virtualizing an entire device? Do you fake the screen dimensions to look like something else? Input latency? Where does it stop?

No, "does this work" is among the easiest questions to answer in technology. We aren't going to win this war.

xnxabout 1 hour ago
> Obviously apps can tell if they haven't been granted a permission (even if you tried to fake this, they aren't dummies and will know if it's not working),

How can they tell? For the permissions I can think of: location, filesystem, etc. it should be easy to lie/spoof.

ibaikovabout 1 hour ago
I had this (?) happen. I have a soundbar hooked up through spdif in my pc. It automatically switches sources, so I can play music through airplay and then have it play sounds from pc when I open youtube etc. So it switches from airplay music to pc even when nothing is playing on pc. This was happening on some websites and it is extremely annoying.
buildfocusabout 3 hours ago
I've seen this on many many other sites as well, most notably Twitter, and lots of common modern captcha pages too. Very annoying!
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spicyjpegabout 3 hours ago
Browser fingerprinting can get creative at times, to say the least. eBay's WebSocket port scanner [1] and Reddit's abuse of DRM and JavaScript JIT exploits [2] from years ago are two examples of the kind of in-depth introspection you can perform completely in the background using nothing more than simple non-permission-gated APIs.

[1] https://blog.nem.ec/2020/05/24/ebay-port-scanning/

[2] https://iter.ca/post/reddit-whiteops/

emctechabout 2 hours ago
Thanks for the reads
sillyboi38 minutes ago
I thought the App Store review guidelines explicitly prohibit hidden features and using public APIs outside their intended purpose. Is audio-based fingerprinting just not something review can realistically catch?
ValdikSS35 minutes ago
They probe all audio devices, including microphones, which probably temporarily switches Bluetooth devices into HPF mode due to how Bluetooth duplex audio works.

I'd argue it's "silent" though: aliexpress wakes up my audio card if nothing plays, which results in a very faint "pop" sound every time I open the tab.

It's been this way for ~3+ years at least.

lapcat14 minutes ago
It's the website.

The title of the article literally mentions "WebAudio", and the first paragraph states that the author is using a PC. The second paragraph mentions Chrome and Firefox.

Apple and the App Store have zero involvement here.

nkjoepabout 3 hours ago
JS enabled by default seems every day less secure.
emctechabout 3 hours ago
So many website break completely with JS disabled and you end up having to enable it half the time anyway.
ruudaabout 2 hours ago
About half of the time, when a website doesn't work with js disabled, I realize that I didn't want to see the page that badly anyway, and I close the tab.
masfuerteabout 2 hours ago
It was pretty good until about six months ago. Since then loads of sites have added a js requirement to try to stop the AI bots.
MisterTeaabout 2 hours ago
IMO web browser have been enabling all sorts of obnoxious behavior since before JS. One of my all time favorites were the sites that opened pop-ups in a loop faster than you could close them while an audio clip of a guy yelling "Hey everyone! I'm looking at gay porn!" You had to hit reset. Fuck the Web.
afandianabout 2 hours ago
The web around the late 90s and early 2000s had some really sketchy stuff. I think the difference is that it used to be the sleazy underbelly. Now it's accepted as mainstream.

My local 'newspaper' website is chock full of scam adverts. The print version is dignified. The website people, somehow, turn a blind eye.

And I got an advert on Youtube this week using sexually explicit language to sell pills.

Feels like standards, and expectations, have really slipped.

kappi14 minutes ago
It's not just BT audio. In windows PC, if aliexpress is opened in one tab in chrome, and switching to a tab with youtube opened, audio don't play in this tab if you start playing youtube.
ngl999about 3 hours ago
Just curious, why silent sound would allow fingerprinting? What are they sampling if it can't be heard?
emctechabout 3 hours ago
The script generates a known waveform, it is passed through the browser's audio implementation and then the script analyses the result after. Based on your devices settings and hardware the output will be different, e.g. a PC with analog output might have 44KHz audio output bandwidth, but a bluetooth headset might have a lower, different audio bandwidth. That is a datapoint that can be used in device fingerprinting alongside screen and viewport dimensions, device pixel ratio, browser plugins, etc.
Grombobulous16 minutes ago
If this wasn't such a serious issue I'd be inclined to make a joke about being surprised that AliExpress was capable of such a thing, but I guess the complete shitshow of a website is intentional.

I wouldn't be surprised if what I'm feeling is all a psychological thing where consumers associate jank with low prices so that's why sites like AliExpress and Temu look like a complete technical mess when in reality they're doing pretty advanced stuff like this.

goodpointabout 2 hours ago
90% of this stuff should be illegal
CTDOCodebasesabout 3 hours ago
They have been doing this for months.

No sound playing but the audio would change like the microphone was being activated. I checked permissions to make sure there was no mic access and figured that they were fingerprinting.

emctechabout 3 hours ago
I had noticed it before but I was browsing AE a lot today and i got fed up with it. What browser and OS are you using?
CTDOCodebasesabout 1 hour ago
It was happening when I was using Chrome on iPhone and Windows 11 with Chrome. I can't remember what was causing it since the headphones (Bose Quietcomfort SE) are synced with both devices. For the last couple of months I've been using Android and I haven't noticed it. The headphones seem to work better with Android. IOS is a bit weird with sharing them with my PC.
ankushdograukabout 1 hour ago
This is the reason I use adguard everywhere
emctech33 minutes ago
I use ublock origin and by default it wasn't blocking, i had to make a custom filter to block the scripts in order for it to prevent the audio takeover. Maybe adguard does a better job? Someone else suggested just wholesale disabling of JS but it is the nuclear option.
nottorpabout 2 hours ago
Besides the privacy implications, they are also wasting our fucking batteries on this crap...
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lapcatabout 1 hour ago
Cloudflare challenges also use Web Audio, by the way.
echelon_muskabout 3 hours ago
OP please submit the filter to an upstream uBlock filter list.
emctechabout 3 hours ago
Will do! edit - How do i do this? through github issues? https://github.com/uBlockOrigin/uAssets/issues
DrammBA34 minutes ago
Yes, that's the correct repo. Create an issue and mention the page and filters you created.
pamaabout 2 hours ago
Another reason why Lockdown mode on iOS is your friend.
eur0paabout 1 hour ago
Lockdown mode is great, but it breaks phone calls on your Apple Watch (found that out the hard way)
realusernameabout 2 hours ago
Somebody else mentioned here that they also do it on the iOS app and I don't see how Lockdown mode would change anything, it doesn't prevent to play audio.