15. August 2021

This article has been indexed from E Hacking News – Latest Hacker News and IT Security News

Mimikatz has been used by a vulnerability researcher to dump a user’s unencrypted plaintext Microsoft Azure credentials from Microsoft’s new Windows 365 Cloud PC service. Benjamin Delpy designed Mimikatz, an open-source cybersecurity software that allows researchers to test various credential stealing and impersonation vulnerabilities.

Microsoft’s Windows 365 cloud-based desktop service went live on August 2nd, allowing customers to rent Cloud PCs and access them via remote desktop clients or a browser. Microsoft offered free virtual PC trials, which rapidly sold out as consumers hurried to receive their two-month free Cloud PC. 

Microsoft announced their new Windows 365 cloud-based virtual desktop experience at the Inspire 2021 conference, which allows organizations to deploy Windows 10 Cloud PCs, as well as Windows 11 eventually, on the cloud. This service is built on top of Azure Virtual Desktop, but it has been modified to make managing and accessing a Cloud PC easier. 

Delpy told that he was one of the lucky few who was able to receive a free trial of the new service and began testing its security. He discovered that the brand-new service allows a malicious programme to dump logged-in customers’ Microsoft Azure plaintext email addresses and passwords. The credential dumps are carried out using a vulnerability he identified in May 2021 that allows him to dump plaintext credentials for Terminal Server users. While a user’s Terminal Server credentials are encrypted when kept in memory, Delpy claims he could decrypt them using the Terminal Service process.