Oasis Security Research Team Discovers Microsoft Azure MFA Bypass
www.oasis.security
Critical vulnerability could have allowed malicious actors to gain unauthorized access to users’ Microsoft accounts.

Archived

Here is the report (pdf) – (archived)

Oasis Security’s research team uncovered a critical vulnerability in Microsoft’s Multi-Factor Authentication (MFA) implementation, allowing attackers to bypass it and gain unauthorized access to the user’s account, including Outlook emails, OneDrive files, Teams chats, Azure Cloud, and more. Microsoft has more than 400 million paid Office 365 seats, making the consequences of this vulnerability far-reaching.

The bypass was simple: it took around an hour to execute, required no user interaction and did not generate any notification or provide the account holder with any indication of trouble.

[Edit to insert the original link to the Oasis site.]

  • narc0tic_bird@lemm.ee
    16·
    10 hours ago

    Same here. I feel like having to enter it so many times isn’t just more annoying but also makes the users more susceptible to phishing attacks ad they’ll naturally pay less attention where they’re entering the 2FA code into when they do it so routinely.

    • maxprime
      9·
      10 hours ago

      Yes totally.

      And why do I have to 2FA on my phone? It’s not 2F when it’s the same device.