Someone found a clever #sidechannel to abuse #Cloudflare CDN caching to reveal the approximate location (~location of next big datacenter) of #Signal and #Discord users by sending them a message/notification with an image in it that is fetched from the...

[yrlf@graz.social]

Someone found a clever #sidechannel to abuse #Cloudflare CDN caching to reveal the approximate location (~location of next big datacenter) of #Signal and #Discord users by sending them a message/notification with an image in it that is fetched from the CDN:

Unique 0-click deanonymization attack targeting Signal, Discord and hundreds of platform

Unique 0-click deanonymization attack targeting Signal, Discord and hundreds of platform - research.md

Gist (gist.github.com)

@signalapp