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.]

    • N0x0n
      1·
      15 hours ago

      It’s related though. If you have enough money, the means and interest, nothing is impossible. Specially if you are a big player/monopoly in IT.

      Yes I don’t have any degree in cryptography, AI, or any related stuff in security and mathematics, however I read a lot, tinker a lot and work hard to maintain my homelab and self-hosted services. I’m not intelligent by any mean but I’m not stupid either, critical thinking is a very important aspect but I digress.

      To give you another example, to better understand my comment on why I’m thinking like this, are some of the NIST curves in cryptography to sign SSL certificates which do not contain any backdoor by itself but have known weaknesses which allowed the NSA to snoop on communication for years… Intentionally or not that’s you to decided with your personal believes. And that’s not something I read on reddit or first search engine result but mostly research papers or people in the education sector writing trusted paper. And thankfully zlibrary exist or I woulsn’t be able to access those resources.

      I surely oversimplified everything here, with my limited knowledge, but that doesn’t take away (IMO) that we shouldn’t trust any big player in the IT infrastructure overall.

      PS: And yes Microsoft probably doesn’t need to implemented such measure, cauz’ people are anyway giving those info away for free… You’re right on this point :).