Microsoft Windows Server 2016
Zone information must be preserved when saving attachments
Description
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.
Check
The default behavior is for Windows to mark file attachments with their zone information.If the registry Value Name below does not exist, this is not a finding.If it exists and is configured with a value of "2", this is not a finding.If it exists and is configured with a value of "1", this is a finding.Registry Hive: HKEY_CURRENT_USERRegistry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Attachments\Value Name: SaveZoneInformationValue Type: REG_DWORDValue: 0x00000002 (2) (or if the Value Name does not exist)
Fix
The default behavior is for Windows to mark file attachments with their zone information.If this needs to be corrected, 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".