Exchange ActiveSync (EAS) must only use certificate-based authentication to access email.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-69727 | EX13-CA-000035 | SV-84349r1_rule | Medium |
| Description |
|---|
| Identification and Authentication provide the foundation for access control. For EAS to be used effectively on DoD networks, client certificate authentication must be used for communications between the MEM and email server. Additionally, the internal and external URLs must be set to the same address, since all EAS traffic must be tunneled to the device from the MEM. The risk associated with email synchronization with CMD should be mitigated by the introduction of MEM products and is specified in the DoD CIO memo dated 06 Apr 2011. The memo states specifically, "Email redirection from the email server (e.g., Exchange Server) to the device shall be controlled via centrally managed server." When EAS is used on DoD networks, the devices must be managed by an MEM. |
| STIG | Date |
|---|---|
| MS Exchange 2013 Client Access Server Security Technical Implementation Guide | 2019-12-18 |
Details
| Check Text ( C-70171r1_chk ) |
|---|
| Open the Exchange Management Shell and enter the following commands: Get-ActiveSyncVirtualDirectory | Select Name, Identity Get-ActiveSyncVirtualDirectory -Identity ' Note: The The command should return the following: BasicAuthEnabled : False WindowsAuthEnabled : False ClientCertAuth : Required WebSiteSSLEnabled : True InternalAuthenticationMethods : {Certificate} ExternalAuthenticationMethods : {Certificate} If the values above are not returned, this is a finding. |
| Fix Text (F-75933r1_fix) |
|---|
| Open the Exchange Management Shell and enter the following command: Set-ActiveSyncVirtualDirectory -Identity ‘ Note: The |