A security researcher made a tool that let them quickly check which of Cloudflare's data centers had cached an image, which allowed them to figure out what city a Discord, Signal, or Twitter/X user might be in.

cross-posted from: https://lemmy.ca/post/37638868 !privacy@lemmy.dbzer0.com

This affects Signal too

An issue with Cloudflare allows an attacker to find which Cloudflare data center a messaging app used to cache an image, meaning an attacker can obtain the approximate location of Signal, Discord, Twitter/X, and likely other chat app users. In some cases an attacker only needs to send an image across the app, with the target not clicking it, to obtain their location.

https://gist.github.com/hackermondev/45a3cdfa52246f1d1201c1e8cdef6117?ref=404media.co

Signal, an open-source encrypted messaging service, is widely used by journalists and activists for its privacy features. Internally, the app utilizes two CDNs for serving content: cdn.signal.org (powered by CloudFront) for profile avatars and cdn2.signal.org (powered by Cloudflare) for message attachments.

  • melroy@kbin.melroy.org
    75·
    23 hours ago

    Another reason to not use Cloudflare. Not that long ago they also “lost the log records” (this incident happened on November 14, 2024). I strongly believe the internet can become better without Cloudflare, especially now basically the whole world is depending on it.

    • sunzu2@thebrainbin.org
      6·
      20 hours ago

      It is impossible to use most of corpo internet if you block cloudflare. Shit is wild.

      Not sure who is down voting you lol

      I wish people would respond with a rebuttal so we can move convo forward.