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Researchers uncover critical vulnerability in Microsoft's Multi-Factor Authentication, allowing attackers to gain access to user accounts such as Outlook emails, OneDrive files, Teams chat, and more (www.oasis.security)

submitted 1 day ago* (last edited 1 day ago) by thelucky8@beehaw.org to c/technology@beehaw.org

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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.]

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[–] darvit@lemmy.darvit.nl 3 points 20 hours ago (1 children)

There's no reason to self-backdoor the authentication mechanism if you already have access to the account's data. Also it sounds like you are very smart.

[–] N0x0n@lemmy.ml 2 points 18 hours ago* (last edited 18 hours ago) (1 children)

Uhhhg... Why so offensive? I'm just saying that if you trust a multi billion dollar company, your trust is in the wrong place.

If you are privacy conscious and have to deal with Microsoft's services because your workplace doesn't know better... I feel sorry for you.

[–] darvit@lemmy.darvit.nl 3 points 18 hours ago (1 children)

That's a totally different point though, on which I agree.

[–] N0x0n@lemmy.ml 1 points 16 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 :).