Researchers who discovered a massive flaw in the main databases stored in Microsoft's Azure cloud platform on Saturday (Aug 28) urged all users to change their digital access keys, not just the 3,300 it notified this week.
As first reported by Reuters, researchers at a cloud security company called Wiz discovered this month they could have gained access to the primary digital keys for most users of the Cosmos DB database system, allowing them to steal, change or delete millions of records.
Alerted by Wiz, Microsoft rapidly fixed the configuration mistake that would have made it easy for any Cosmos user to get into other customers' databases, then notified some users Thursday to change their keys.
In a blog post Friday, Microsoft said it warned customers which had set up Cosmos access during the weeklong research period. It found no evidence that any attackers had used the same flaw to get into customer data, it noted.
"Our investigation shows no unauthorized access other than the researcher activity," Microsoft wrote. "Notifications have been sent to all customers that could be potentially affected due to researcher activity," it said, perhaps referring to the chance that the technique had leaked from Wiz.
"Though no customer data was accessed, it is recommended you regenerate your primary read-write keys," it said.
The US Department of Homeland Security's Cybersecurity and Infrastructure Security Agency used stronger language in a bulletin Friday, making clear it was speaking not just to those notified.
"CISA strongly encourages Azure Cosmos DB customers to roll and regenerate their certificate key," the agency said.
Experts at Wiz, founded by four veterans of Azure's in-house security team, agreed.
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