Office365 Security: Local Active Directory Expires Attribute does not disable Office365 AccountJon Prange, Director of Managed Services | September 21, 2018
During some recent testing, we have discovered that the Local Active Directory attribute AccountExpires does not properly synchronize with Azure Active Directory (AAD), which is used with Office365. Many organizations use this feature (AccountExpires) to set a future date for an account expiration as part of their termination policy for future terminations but also for contractors and consultants.
Some organizations utilize Active Directory Federated Services (ADFS) to authenticate users, meaning that the user authenticates their sign in with the local directory so this will prevent the user from using local resources (logging into computers, VPN connections into the network, etc.) as well as Office365 services (Exchange, Sharepoint, Skype). Other organizations rely on Azure Active Directory to authenticate users and, while this does disable the user from using local resources, it does not prevent the user from signing into Office365 and using those services.
The only way to prevent the user from signing into Office365 in this scenario is through one of two methods:
- Disable the local account which will then be synchronized to Azure Active Directory using Azure AD Connect
- Edit the Sign In Status in the Office365 Console and change it to blocked
This has been reported to Microsoft as a big security flaw since it would allow users that an organization expects to be prevented from accessing resources to still access all of the Office365 services.
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