Pin Bypass in Passwordless WebAuthn on Microsoft.com and Nextcloud (opens in new tab)

(hwsecurity.dev)

7 pointssufficient5y ago3 comments

3 comments

Looks like Microsoft doesn't understand the specification that they wrote down themselves: It is a bug if an attacker can take over my entire Microsoft account via NFC. I wonder if Microsoft can make amends for any damage it causes. Credit card companies can do this and that's why some NFC payments are only 1FA.

serjd5y ago

> We reported the issue to Microsoft. They did not consider it a vulnerability, but fixed it

Seems like Microsoft doesn't like to pay for a bug bounty

sufficientOP5y ago

I agree that it's weird that they fixed it and didn't consider it a security issue.

For the user it looked like it would provide two-factor authentication since the PIN is requested, while in reality it's not verified. Thus, they only provided one-factor security.

j / k navigate · click thread line to collapse