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Signal downplays encryption key flaw, fixes it after X drama
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
The whole drama seems to be pushing for Electron's safeStorage API, which uses a device's secrets manager. But aren't secrets stored there still accessible when the machine is unlocked anyway? I'm not sure what this change accomplishes other than encryption at rest with the device turned off - which is redundant if you're using full disk encryption.
I don't think they're downplaying it, it just doesn't seem to be this large security concern some people are making it to be.
This is like the third time in the past two months I've seen someone trying to spread FUD around Signal.
I think the OS prevents apps from accessing data in those keychains, right? So there wouldn't be an automated/scriptable way to extract the key in as easy of a way.
But that's the thing: I haven't found anything that indicates it can differentiate a legitimate access from a dubious one; at least not without asking the user to authorize it by providing a password and causing the extra inconvenience.
If the wallet asked the program itself for a secret - to verify the program was legit and not a malicious script - the program would still have the same problem of storing and retrieving that secret securely; which defeats the use of a secret manager.
It's not about legitimate access versus illegitimate access. As I understand it, these keychains/wallets can control which specific app can access any given secret.
It's a method of sandboxing different apps from accessing the secrets of other apps.
In function, browser access to an item can be problematic because browsers share data with the sites that it visits, but that's different from a specific app, hardcoded to a specific service being given exclusive access to a key.
upon reading a bit how different wallets work, it seems macos is able to identify the program requesting the keychain access when it's signed with a certificate - idk if that's the case for signal desktop on mac, and I don't know what happens if the program is not signed.
As for gnome-keyring, they ackowledge that doing it on Linux distros this is a much larger endeavor due to the attack surface:
Also
In other words, the problem is beyond the scope of gnome-keyring. Maybe now with diffusion of Wayland and more sandboxing options reducing this context becomes viable.
You are absolutely correct. This can help in a world where every app is well sandboxed (thus can be reliably identified and isolated).