اعتبارنامه Microsoft Azure به صورت متن ساده توسط ویندوز 365 در معرض دید قرار گرفت

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. 

مایکروسافت تجربه جدید دسکتاپ مجازی مبتنی بر Windows 365 خود را در کنفرانس Inspire 2021 اعلام کرد که به سازمان‌ها اجازه می‌دهد رایانه‌های شخصی Windows 10 Cloud و همچنین ویندوز 11 را در نهایت بر روی فضای ابری مستقر کنند. این سرویس بر روی دسکتاپ مجازی Azure ساخته شده است، اما برای تسهیل مدیریت و دسترسی به یک رایانه Cloud تغییر یافته است. 

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. 

To test this technique, BleepingComputer used a free Cloud PC trial on Windows 365. They entered the “ts::logonpasswords” command after connecting through the web browser and started mimikatz with administrative privileges, and mimikatz promptly dumped their login credentials in plaintext. 

While mimikatz was designed for researchers, threat actors frequently use it to extract plaintext passwords from the LSASS process’ memory or perform pass-the-hash attacks utilizing NTLM hashes due to the power of its different modules. Threat actors can use this technique to spread laterally across a network until they gain control of a Windows domain controller, allowing them to take control of the entire Windows domain.

To protect against this method, Delpy recommends 2FA, smart cards, Windows Hello, and Windows Defender Remote Credential Guard. These security measures, however, are not yet accessible in Windows 365. Because Windows 365 is oriented toward enterprises, Microsoft is likely to include these security protections in the future, but for the time being, it’s crucial to be aware of the technique.