Microsoft Says It Lost Weeks of Security Logs For Its Customers' Cloud Products

Microsoft has notified customers that it's missing more than two weeks of security logs for some of its cloud products, leaving network defenders without critical data for detecting possible intrusions. From a report: According to a notification sent to affected customers, Microsoft said that "a bug in one of Microsoft's internal monitoring agents resulted in a malfunction in some of the agents when uploading log data to our internal logging platform" between September 2 and September 19. The notification said that the logging outage was not caused by a security incident, and "only affected the collection of log events." Business Insider first reported the loss of log data earlier in October. Details of the notification have not been widely reported. As noted by security researcher Kevin Beaumont, the notifications that Microsoft sent to affected companies are likely accessible only to a handful of users with tenant admin rights. Logging helps to keep track of events within a product, such as information about users signing in and failed attempts, which can help network defenders identify suspected intrusions. Missing logs could make it more difficult to identify unauthorized access to the customers' networks during that two-week window.

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