I dont yet understand this attack. The WP article says: "" Millions of websites contain a string of computer code from Meta that compiles your web activity. It might capture the income you report to the government, your application for a student loan and your online shopping. "" If I read that correctly then they are capturing all https web content you access in clear text and uploads it all to Meta? Then Meta I thou…
It does sound fantastical. A piece of code that can violate the same origin policy would be a huge vulnerability. Meta could be working with other sites to share data on users via code running on both sites, but snooping on tax data without the IRS helping? Unlikely. I can only assume they're suggesting that companies like Intuit and H&R Block are sharing this data with Meta, but that seems like a huge violation of p…
Basically, they created a channel between the browser and a localhost webserver running in their native apps, by abusing the ability to set arbitrary metadata on WebRTC connections. That way, they were able to exfiltrate tracking cookies out of the browser's sandbox to the native app, where they could be associated with your logged-in user identity.