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Microsoft Network Sends Test Traffic to Japanese Cable Maker
27 Jan
Summary
- Microsoft's network misrouted internet test traffic to a Japanese company.
- The anomaly routed traffic for example.com to sei.co.jp subdomains.
- Microsoft has since removed the endpoint causing the routing error.
An unexplained anomaly on Microsoft's network rerouted internet traffic designated for example.com to a Japanese electronics cable manufacturer, Sumitomo Electric.
Under internet standards, example.com should not be routable online but should direct to local network resources. However, Microsoft's autodiscover service was sending traffic, including email setup attempts for Outlook, to sei.co.jp subdomains.
While the specific cause remains unconfirmed by Microsoft, the behavior has ceased. Output now shows 'not found' errors, suggesting the removal of the specific endpoint responsible for the improper routing.
This incident raises concerns about potential security oversights on Microsoft's network, particularly in light of a past incident where a forgotten test account with administrative privileges was exploited by state-sponsored hackers.
