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105

Cloudflare Issue Can Leak Chat App Users' Broad Location (www.404media.co)

submitted 1 day ago* (last edited 1 day ago) by [email protected] to c/[email protected]

32 comments fedilink hide all child comments

cross-posted from: https://lemmy.ca/post/37638868 [email protected]

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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[–] [email protected] 6 points 23 hours 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.

[–] [email protected] 4 points 18 hours ago

You have entirely misunderstood this exploit.

[–] [email protected] 2 points 19 hours ago (1 children)

How so? Asking out of curiosity.

[–] [email protected] 5 points 17 hours 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.

[–] [email protected] 2 points 13 hours ago* (last edited 13 hours 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.

[–] [email protected] 3 points 17 hours 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.