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TikTok requests access to devices on local network

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Re: TikTok requests access to devices on local network

#111
post #83

Earlier quoted context omitted.

> a loud minority completely unironically still use desktop & laptop computers for activities besides work. Is using a desktop or laptop for non-work activities ironic somehow?

I honestly don’t know what exactly irony means. unironically = sincerely/earnestly

Right; I wasn't playing grammar gotcha. I use my laptop for non-work activities, and I guess I do so sincerely. Do people use their laptops or desktops for non-work activities somehow insincerely?

Re: TikTok requests access to devices on local network

#113

They used to check your clipboard the whole time too. They use the local network as one of their sensors to identify you (fingerprinting). However they have plenty more (see their privacy policy).

> They use the local network as one of their sensors to identify you (fingerprinting).

But why? It's an app... I guess this can allow them to link other people in your household to you, but isn't the wifi network name already available?

Re: TikTok requests access to devices on local network

#115

Earlier quoted context omitted.

The cool thing about phones is that you can MITM yourself and see what apps are sending, assuming they don't certificate pin (which TikTok doesn't). The person that reported this during the beta period didn't find any evidence when doing so. https://old.reddit.com/r/videos/comments/fxgi06/not_new_news...

Can you actually still widely do this? Last time I checked on the latest versions of Android apps don't accept user certificates so you can't really do much about any https traffic, which really is the bulk.

From a legitimate reverse engineering/security auditing standpoint, cert pinning is generally very trivial to bypass.

see: Frida, xposed framework (not sure if still relevant)

Re: TikTok requests access to devices on local network

#116

They used to check your clipboard the whole time too. They use the local network as one of their sensors to identify you (fingerprinting). However they have plenty more (see their privacy policy).

> They used to check your clipboard the whole time too. To be fair quite a lot of apps did this to enable deep links/automatically opening certain clipboard links. Every big app has changed this to no longer show the 'pasted from' notification. And it was never shown that they export those clipboard contents to homebase.

"Okay so TikTok is grabbing the contents of my clipboard every 1-3 keystrokes. iOS 14 is snitching on it with the new paste notification pic.twitter.com/OSXP43t5SZ "

— Jeremy Burge (@jeremyburge) June 24, 2020

TikTok wasn’t checking it for link opening …

Re: TikTok requests access to devices on local network

#117

Just to add: Scanning networks to gather data seems pretty popular these days - smart tvs have done so, and even the ebay site used to portscan visitors [1]. [edit] And of course, there's WebRTC leaking your local IP - which ublock origin can specifically block [2]. [1] https://www.bleepingcomputer.com/news/security/ebay-port-sca... [2] https://github.com/gorhill/uBlock/wiki/Prevent-WebRTC-from-l...

Many common wifi APs (eg TP-link EAP225) will allow you to create separate wifi networks on different VLANs. You can use this to isolate internet of shit devices onto their own networks where they can’t talk to your other devices, without increasing your hardware costs or causing wifi interference.

You’ll need a router/firewall and an AP that are both VLAN-aware. I personally use an EAP225 and some eBay industrial PC running freebsd.

Re: TikTok requests access to devices on local network

#118

Just to add: Scanning networks to gather data seems pretty popular these days - smart tvs have done so, and even the ebay site used to portscan visitors [1]. [edit] And of course, there's WebRTC leaking your local IP - which ublock origin can specifically block [2]. [1] https://www.bleepingcomputer.com/news/security/ebay-port-sca... [2] https://github.com/gorhill/uBlock/wiki/Prevent-WebRTC-from-l...

Iirc the ebay thing was yet another way to fingerprint you to re-identify fraudulent account creators.

Re: TikTok requests access to devices on local network

#119
post #41

Some other apps (Signal?) have also done this out of the blue, though they may have since added a UI around this. Regardless, Apple has done the right thing by putting this behind a permissions box, but the developer should be required to have some sort of explanation string of why they need this.

I assume signal is udp hole punching to get around NAT.

Signal uses local networking for the account migration functionality: https://support.signal.org/hc/en-us/articles/360007059752-Ba...

You scan a QR code with one device and it transfers the entire account state to the new phone.

Re: TikTok requests access to devices on local network

#120

Earlier quoted context omitted.

Is this separate from mDNS [1]? A lot of smart TVs and PCs increasingly use mDNS to support some fairly handy consumer features, like AirDrop, being able to setup your TV with your phone, network printing/scanning, ChromeCast, whole-home control of lights & other IoT devices, etc. [1] https://en.wikipedia.org/wiki/Multicast_DNS

The incident I'm referring to was about LG [1]. The report includes network captures, so I'd trust it. Apparently, some chinese smart TV brands have been doing similar things, but I wouldn't be surprised if most other vendors have caught up and used stealthier techniques. [edit] Here's the news about those chinese TVs [2] and the original report [3] [1] https://arstechnica.com/information-technology/2013/11/lg-sm...…

Small point: LG is a Korean company, not Chinese.
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