WASHINGTON ¨C Yahoo on Friday faced pointed questions about exactly when it learned about a cyberattack that exposed the email credentials of 500 million users, a critical issue for the company as it seeks to prevent the breach from affecting a pending takeover by Verizon Inc.
The internet company has so far not provided a clear, detailed timeline about when it was made aware of the breach, announced Thursday. Yahoo blamed the incident on a ¡°state-sponsored actor¡± but has not provided any technical information supporting that claim.
¡°We don¡¯t know a lot. We don¡¯t know how the bad guys broke in. We don¡¯t know when Yahoo first found out,¡± said Jeremiah Grossman, chief of security strategy for SentinelOne and a former information security officer at Yahoo.
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