WN25-UC-000010 - Windows Server 2025 must preserve zone information when saving attachments.

Information

Attachments from outside sources may contain malicious code. Preserving zone of origin (internet, intranet, local, restricted) information on file attachments allows Windows to determine risk.

Solution

The default behavior is for Windows to mark file attachments with their zone information.

To correct this, for each user profile on the system configure the policy value for User Configuration >> Administrative Templates >> Windows Components >> Attachment Manager >> Do not preserve zone information in file attachments to 'Not Configured' or 'Disabled'.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Windows_Server_2025_V1R4_STIG.zip