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This article details TrustSink, an identity attack where rogue authentication providers intercept passwords during legitimate Microsoft Entra logins by mimicking trusted MFA steps. As a post-compromise persistence mechanism requiring privileged access, it highlights critical vulnerabilities in cloud identity management and the risks associated with external authentication methods. The threat underscores the need for robust validation of authentication policies to prevent credential theft within established trust frameworks.

Source coveringCybersecurity News

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TrustSink Attack Uses Rogue MFA Provider to Steal Microsoft Entra Passwords During Legitimate Logins

Cybersecurity NewsSeptember 28, 20264 min read

TrustSink is a newly disclosed identity attack that turns a trusted MFA step into a password-stealing trap. Rather than sending victims to a clearly fake website, it places a convincing password prompt inside a normal Microsoft Entra sign-in. In the researchers’ test tenant, the victim can complete MFA and reach the intended application without an […] The post TrustSink Attack Uses Rogue MFA Provider to Steal Microsoft Entra Passwords During Legitimate Logins appeared first on Cyber Security News.

TrustSink is a newly disclosed identity attack that turns a trusted MFA step into a password-stealing trap. Rather than sending victims to a clearly fake website, it places a convincing password prompt inside a normal Microsoft Entra sign-in. In the researchers’ test tenant, the victim can complete MFA and reach the intended application without an error. A password reset alone may not solve the problem, because the rogue authentication provider can remain active and…

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