Security researchers from Proofpoint discovered critical security vulnerabilities with multi-factor authentication (MFA) implementations in the cloud environment where the WS-Trust is enabled.
WS-Trust is a specification and OASIS standard designed to manage with the issuing, renewing, and validating of security tokens.
“Due to the way Microsoft 365 session login is designed, an attacker could gain full access to the target’s account (including mail, files, contacts, data, and more).”
Researchers describe two possible cases that attacker can exploit the vulnerability;
In all cases, Microsoft logs the connection as “Modern Authentication” due to the exploit pivoting from legacy protocol to the modern one, Proofpoint said .
Proofpoint believes that these vulnerabilities existed for years and they are to be demonstrated at their virtual user conference, Proofpoint Protect.
Multi-factor authentication provides a higher level of security to the users, it involves an extra step of authentication to protect the user accounts.
During this pandemic period organizations shifted employees to work from home and they started accessing corporate networks from personal laptops.
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