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Signal leaked random contacts to me! (feddit.de)

submitted 9 months ago* (last edited 9 months ago) by ErKaf@feddit.de to c/privacy@lemmy.ml

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When I press on some message to forward it, it shows me Random usernames of contacts I don't know. And it even shows some Mobile Numbers I don't know. For example, one number starts with +964 that's Iraq. I'm from Europe tho. These contacts and numbers are from all over the place.

Edit: This only happens on Signal Desktop. If I try to forward a message on Android it only shows my Contacts. And none of these unkown ones.

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[–] Templa@beehaw.org 22 points 9 months ago (10 children)

Why did someone see that I joined Signal? People who already know your number and already have you in their contacts see that they can contact you on Signal. Nothing is sent to them by your Signal app or the Signal service. They just see a number they know is registered. If someone knows how to send you an insecure SMS, we want them to see that they can send you a Signal message instead.

Why did I see that my contact joined Signal? You are notified when someone that is stored in your contact list is a new Signal user. If you can send an insecure SMS to a contact, we want you to know you can send a Signal message instead.

I hate this.

[–] ReversalHatchery@beehaw.org 12 points 9 months ago (9 children)

So Signal does not protect against those that fill their contacts with every existing number?

But also, this does not explain why is it only happening in the desktop app for OP

[–] qwerty_bastard@feddit.uk 19 points 9 months ago (2 children)

Protect against what? People knowing you have Signal? Excuse me if it's obvious to everyone else, but I'm struggling to understand the issue here.

[–] aintnofilthybot@feddit.de 8 points 9 months ago (2 children)

It confirms that your number is valid and in use.

[–] Redjard@lemmy.dbzer0.com 3 points 9 months ago (1 children)

You can check that in the phone app too. Hit new message, enter the numer, hit "New message to... " and it'll tell you if it isn't known. There is rate limiting in that function, you'd need a lot of signal accounts to sweep all phone numbers.
You could also try signing up to signal using the number you want to check.

Neither way however you would get the signal name or profile pic of the number if I understand it correctly, that would get sent if they reply to you.

[–] Xer0@lemmy.ml 1 points 9 months ago (1 children)

I mean, ever heard of a phonebook?

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