Vulnerability V-228391

NOTE: In some instances, AnonymousUsers may be necessary for organization-specific operations. In such cases, allowing AnonymousUsers must be paired with restricting to specific lists of servers allowed to access. In addition, the risk must be documented and accepted by the ISSO, ISSM, or AO. Open the Exchange Management Shell and enter the following command: Get-ReceiveConnector | Select Name, Identity, PermissionGroups For each Receive connector, if the value of "PermissionGroups" is "AnonymousUsers" for any receive connector, this is a finding.

Open the Exchange Management Shell and enter the following command: Set-ReceiveConnector -Identity <'IdentityName'> -PermissionGroups and enter a valid value user group. Note: The <IdentityName> value must be in single quotes. Example: Set-ReceiveConnector -Identity <'IdentityName'> -PermissionGroups ExchangeUsers Repeat the procedures for each Receive connector.