this post was submitted on 30 May 2024
210 points (94.1% liked)
Asklemmy
43790 readers
855 users here now
A loosely moderated place to ask open-ended questions
Search asklemmy ๐
If your post meets the following criteria, it's welcome here!
- Open-ended question
- Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
- Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
- Not ad nauseam inducing: please make sure it is a question that would be new to most members
- An actual topic of discussion
Looking for support?
Looking for a community?
- Lemmyverse: community search
- sub.rehab: maps old subreddits to fediverse options, marks official as such
- [email protected]: a community for finding communities
~Icon~ ~by~ ~@Double_[email protected]~
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
How would MS Authenticator make it any better than TOTP?
To break TOTP, the attacker would need to:
a) be able to observe the initial exchange of the TOTP secrets. To do that, the attacker needs access to the victim's computer (on user level) at that specific time they set up TOTP. TOTP is a TOFU concept and thus not designed to protect against that. However, if the attacker controls the victim's computer at that time, the victim is screwed anyways even before setting up 2FA.
b) have access to the TOTP app's secret storage and to the victim's login credentials (e.g. by phishing). If the attacker can gain that level of access, they would also have access to the Microsoft Authenticator's secret storage, so there is no benefit of the Microsoft app.
On the other hand, Microsoft Authenticator is a very huge app (>100MB is huge for an authenticator app, Aegis is just 6MB, FreeOTP+ 11MB), i.e. it brings a large attack surface, especially by connecting to the internet.
I don't think Microsoft Authenticator brings security benefits over a clean and simple TOTP implementation.
If it is just the location, then it could be spoofed.
If it is something that requires physical presence, then you need both devices to communicate with each other. If it is not done via QR code (like some online banking do), then both devices need to be connected, e.g. via WiFi or Bluetooth. In this case, if an attacker controls one of the devices (that's the class of attacks 2FA should prevent you from), the attacker probably controls both devices. So what's the point then?