this post was submitted on 21 Jan 2025
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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.

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[–] boaratio@lemmy.world 8 points 1 week ago (2 children)

I don't want to be a contrairian, but your cellphone carrier does this non stop. Cloudflare is not a good company, but this is the least of your problems.

[–] Rogue@feddit.uk 4 points 1 week ago

You have entirely misunderstood this exploit.

[–] ByteOnBikes@slrpnk.net 2 points 1 week ago (1 children)

How so? Asking out of curiosity.

[–] boaratio@lemmy.world 7 points 1 week ago (2 children)

I'm not trying to wear a tinfoil hat, but Snowden clearly revealed that the government is easily able to purchase cellphone location data based on GPS and tower data more easily than they can go through the FISA courts.

[–] Danitos@reddthat.com 3 points 1 week ago

Your cellphone provider very likely already sells this data.

I know mine does, because I attended a webinar of a buying company where they explicitly mentioned this.

[–] ByteOnBikes@slrpnk.net 2 points 1 week ago* (last edited 1 week ago)

Ah, thought you meant though metadata. Like a end user snooping through some obscure meta data method (even after cleaning) let's you triangulate something.