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

submitted 1 year ago* (last edited 1 year 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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[-] ripe_banana@lemmy.world 175 points 1 year ago* (last edited 1 year ago)

For all of our safety, consider submitting a bugreport.

[-] ErKaf@feddit.de 52 points 1 year ago

Thanks for the Link. I submitted a report.

[-] KLISHDFSDF@lemmy.ml 15 points 1 year ago

link to report so we can track? thanks!

[-] rockSlayer@lemmy.world 12 points 1 year ago

I don't think it's the same user, but here's a report on GitHub with same repro

[-] ErKaf@feddit.de 6 points 1 year ago* (last edited 1 year ago)

This is a totally different thing, and I also don't get what the problem of this user is. He wants to share a picture and then just like on android the list of your recent chats opens where of course the pofilepic shows to know where you want to send it to, and he somehow doesn't want the profile pic to be there even tho this is totally normal behavior from android and iOS since... always? Or do I misunderstand his problem because I don't use iOS? Well the most important part, it doesn't sound like my problem at all.

[-] elias_griffin@lemmy.world 12 points 1 year ago

What that user is describing is very serious. They are saying iOS can reach into Signal and extract data.

[-] folkrav@lemmy.ca 12 points 1 year ago* (last edited 1 year ago)

The user is describing iOS' share sheet, which Signal seems to advertise as a feature. The OS isn't reaching in and grabbing data, Signal is providing data to the OS.

Also note that said user signaled this on the Signal-Android repo, which combined with their inability to find this info, when i don't even own an iOS device, makes me think they aren't the most observant user out there.

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[-] ErKaf@feddit.de 5 points 1 year ago

I just followed his link and submitted my report. Don't have any link.

[-] hersh@literature.cafe 46 points 1 year ago

Has anyone else been able to reproduce this? I just tried and was not able to.

OP, is it possible these people were in group chats you were part of?

[-] aodhsishaj@lemmy.world 16 points 1 year ago

I still don't see any bug report anyone can follow up on.... I cannot trust OP's experience until that's linked here.

[-] ErKaf@feddit.de 8 points 1 year ago

The bug report forum from Signal doesn't give you any link.

[-] ErKaf@feddit.de 11 points 1 year ago

No, they are not. I'm in two groups. None of them are in the groups. I only use Signal for Real life friends from my Country. I never joined any random group. These people are from all over the world.

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[-] ErKaf@feddit.de 46 points 1 year ago

I just counted. Signal leaked 56 random people to me.

[-] Atemu@lemmy.ml 39 points 1 year ago

Could it be that these are spam numbers that tried to reach you at some point but were blocked before they could?

[-] jherazob@beehaw.org 25 points 1 year ago

They should have added usernames YEARS ago, but instead they go and remove SMS support in the client...

[-] elias_griffin@lemmy.world 22 points 1 year ago* (last edited 1 year ago)

Huge if true! You could conceivably submit your phone to a Cybersecurity company and share in any reward.

Help us with:

Your OS Version
OS settings that are possibly related
How you obtained Signal
Signal version
Video proof
Steps to reproduce

Who knows how to compute a hash for an installed mobile phone app? We need to compare it with legit.

[-] ErKaf@feddit.de 12 points 1 year ago

https://imgur.com/a/a6CQSpA

The video proof. It also shows the OS and Steps to reproduce. How I obtained Signal: Flathub Signal Version: 6.38.0 OS Settings: Nothing relevant.

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[-] Templa@beehaw.org 22 points 1 year ago

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 1 year ago

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 1 year ago

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 1 year ago

It confirms that your number is valid and in use.

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[-] Katzastrophe@feddit.de 14 points 1 year ago

Wtf is happening in these comments

[-] ErKaf@feddit.de 7 points 1 year ago

No clue.

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[-] possiblylinux127@lemmy.zip 13 points 1 year ago

I've been getting spam on signal. I wonder if this is how they got my number

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[-] BearOfaTime@lemm.ee 11 points 1 year ago

Noticed in one of your comments this is happening on Signal desktop. Is this a windows machine? Maybe update your post so people are aware it's no on Android

[-] pkill@programming.dev 9 points 1 year ago

Use molly

[-] Ohh@lemmy.ml 22 points 1 year ago

My confidence in signal is greater than my confidence in a random fork. Privacy is hard... So I feel it's better to trust something less than ideal, than to trust a random dude promising to solve all problems...

That's just my threat model.

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[-] ErKaf@feddit.de 10 points 1 year ago

Its not a problem with the Android App.

[-] LWD@lemm.ee 8 points 1 year ago* (last edited 1 year ago)

deleted

[-] ErKaf@feddit.de 31 points 1 year ago

56 different numbers from all over the world, and all of them are actually real and have signal? I doubt I accidentally do something like this haha :)

[-] Natanael@slrpnk.net 7 points 1 year ago

This is what the docs say.

https://support.signal.org/hc/en-us/articles/360007061452-Does-Signal-send-my-number-to-my-contacts-

[-] JoeBidet@lemmy.ml 6 points 1 year ago

am glad that https://simplex.chat doesn't even need to touch sensitive personal data strong selectors such as phone numbers or email addresses!

[-] emptiestplace@lemmy.ml 13 points 1 year ago

Why is this being downvoted?

[-] shadearg@lemmy.world 13 points 1 year ago

I think some people get lost and don't realize that this is a privacy-centric community.

The mere potential for identifier leaking is 100% anti-privacy.

[-] emptiestplace@lemmy.ml 6 points 1 year ago

Privacy aside, but just for a second - if we don't hold ourselves to a higher standard, our standard will just be lower. That's all that will happen.

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[-] KLISHDFSDF@lemmy.ml 7 points 1 year ago

Likely because while simplex looks great and is very promising, it doesn't add much to the conversation here. Signal is primarily a replacement for SMS/MMS, this means people generally would want their contacts readily available and discoverable to minimize the friction of securely messaging friends/family. Additionally it's dangerous to be recommending a service that hasn't been audited nor proven itself secure over time.

[-] shadearg@lemmy.world 20 points 1 year ago* (last edited 1 year ago)

a service that hasn't been audited

Announcement: The security audit was performed in October 2022 by Trail of Bits, and most fixes were released in v4.2.0
Audit: Trail of Bits - February 2, 2023 - SimpleX Chat - Security Assessment

Edit: provided link to audit

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this post was submitted on 26 Nov 2023

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