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Google Security Technology

Bypassing Google's Two-Factor Authentication 49

Posted by timothy
from the disclaimer-dug-song-is-a-genius-monkey dept.
An anonymous reader writes "The team at Duo Security figured out how to bypass Google's two-factor authentication, abusing Google's application-specific passwords. Curiously, this means that application-specific passwords are actually more powerful than users' regular passwords, as they can be used to disable the second factor entirely to gain control of an account. Duo [publicly released this exploit Monday] after Google fixed this last week — seven months after initially replying that this was expected behavior!"
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Bypassing Google's Two-Factor Authentication

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  • by icebike (68054) on Tuesday February 26, 2013 @02:29PM (#43017285)

    From TFA:

    This is no longer the case as of February 21st, when Google engineers pushed a fix to close this loophole. As far as we can tell, Google is now maintaining some per-session state to identify how you authenticated — did you log in using a MergeSession URL, or the normal username, password, 2-step verification flow? The account-settings portal will only allow you to access security-sensitive settings after username/password/2-step-verification prompt that you can’t skip.

    So, yes, you are correct, that is how it used to work, but not any more.

    Still these ASPs are not in fact "Application" specific. They probably should be, but that would be pretty convoluted and people would throw up their hands and walk away. (I read somewhere that something like 80% of the people that try 2-Factor give up when they see all the hoops that need jumping.

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