They were also upset that Mayer and Yahoo General Counsel Ron Bell did not involve the company's security team in the process, instead asking Yahoo's email engineers to write a program to siphon off messages containing the character string the spies sought and store them for remote retrieval, according to the sources.The sources said the program was discovered by Yahoo's security team in May 2015, within weeks of its installation. The security team initially thought hackers had broken in.When Stamos found out that Mayer had authorized the program, he resigned as chief information security officer and told his subordinates that he had been left out of a decision that hurt users' security, the sources said. Due to a programming flaw, he told them hackers could have accessed the stored emails.Stamos's announcement in June 2015 that he had joined Facebook did not mention any problems with Yahoo. (bit.ly/2dL003k)In a separate incident, Yahoo last month said "state-sponsored" hackers had gained access to 500 million customer accounts in 2014. The revelations have brought new scrutiny to Yahoo's security practices as the company tries to complete a deal to sell its core business to Verizon Communications Inc for $4.8 billion.
http://www.reuters.com/article/us-yahoo-nsa-exclusive-idUSKCN1241YT
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