Forum Discussion
Require MFA for AAD Hybrid joined devices
We are planning a rollout of 2000 new Windows 10 devices to the entire organization on a new domain as part of a merger and accompanying org name change. We have an onprem environment with DCs th...
If the device is already authenticated and has a valid PRT, it will bypass any MFA requirements (having a PRT is considered the same as doing 2FA). They will still be prompted to perform MFA upon the initial device join, or when the PRT has expired.
- Hello Vasil, thank you for the response and for pointing me in the right direction. Is what you are saying, the same as what they are describing here:
https://docs.microsoft.com/en-us/azure/active-directory/devices/concept-primary-refresh-token#when-does-a-prt-get-an-mfa-claim
?
Essentially, that whenever a PRT requests a token, it does so by bypassing MFA or rather with the authority that MFA would grant it?
Do you see any security concerns in this approach in terms of bad actors getting their hands on an unlocked device? And what would be possible remedies?Yup, that's pretty much it. Why do you think it's a security issue?
- Bypassing MFA has our IT department concerned that (for instance):
1) Someone who gets access to an unlocked aad joined device can go directly to Office 365 (using a browser) without being challenged for MFA.
2) Malware will be able to directly attack and access Office 365 services
We understand that if the user for instance has connected Outlook and OneDrive on their pc and sync'ed the content, that MFA is effectively already bypassed, but we want to understand whether the threat surface becomes larger by AAD joining devices or whether our worries are unwarranted :).
