Microsoft Discloses Security Breach of Customer Support Database Containing 250 Million Records

An anonymous reader quotes a report from ZDNet: Microsoft disclosed today a security breach that took place last month in December 2019. In a blog post today, the OS maker said that an internal customer support database that was storing anonymized user analytics was accidentally exposed online without proper protections between December 5 and December 31. The database was spotted and reported to Microsoft by Bob Diachenko, a security researcher with Security Discovery. The leaky customer support database consisted of a cluster of five Elasticsearch servers, a technology used to simplify search operations, Diachenko told ZDNet today. All five servers stored the same data, appearing to be mirrors of each other. Diachenko said Microsoft secured the exposed database on the same day he reported the issue to the OS maker, despite being New Year’s Eve. The servers contained roughly 250 million entries, with information such as email addresses, IP addresses, and support case details. Microsoft said that most of the records didn’t contain any personal user information. “Microsoft blamed the accidental server exposure on misconfigured Azure security rules it deployed on December 5, which it now fixed,” adds ZDNet. They went on to list several changes to prevent this sort of thing from happening again, such as “auditing the established network security rules for internal resources” and “adding additional alerting to service teams when security rule misconfigurations are detected.”