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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 2 days ago* (last edited 2 days ago) by [email protected] to c/[email protected]

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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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[–] [email protected] 36 points 2 days ago (5 children)

MS Auth has got to be the worst 2FA I’ve ever used.

My workplace has it set up where I have to input a second factor several times a day on each device. It’s agonizing.

[–] [email protected] 2 points 22 hours ago

What 2FA do you prefer? I've been thinking of looking for an alternative

[–] [email protected] 25 points 2 days ago (1 children)

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.

[–] [email protected] 15 points 2 days ago

Yes totally.

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

[–] [email protected] 12 points 2 days ago

My biggest annoyance with that is that the prompt doesn't tell you which application it's asking for. Is it Outlook? Is it Teams? Is it OneDrive? Or something that shouldn't be asking for 2fa?

[–] [email protected] 8 points 2 days ago

The second part is literally your workplace though the defaults for timeouts on that are low on O365.

[–] [email protected] 6 points 2 days ago

That’s not an MS thing, that’s the way your admins configured it. There are methods for doing system wide, once every X hours authentication, but chances are they don’t know that or went overkill with the settings to “be more secure”