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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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[–] ramble81@lemm.ee 5 points 1 day 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”