Multi-Factor Auth Bypassed in Office 365 and G Suite IMAP Attacks


Multi-Factor Auth Bypassed in Office 365 and G Suite IMAP Attacks
Bleeping Computer
Massive IMAP-based password-spraying attacks successfully breached Microsoft Office 365 and G Suite accounts, circumventing multi-factor authentication (MFA) according to an analysis by Proofpoint.
This technique takes advantage of the fact that the legacy authentication IMAP protocol bypasses MFA, allowing malicious actors to perform credential stuffing attacks against assets that would have been otherwise protected.
As noted by Proofpoint's Information Protection Research Team in a recent report, during a "recent six-month study of major cloud service tenants, Proofpoint researchers observed massive attacks leveraging legacy protocols and credential dumps to increase the speed and effectiveness of brute force account compromises at scale."
https://www.bleepingcomputer.com/news/security/multi-factor-auth-bypassed-in-office-365-and-g-suite-imap-attacks/

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