Zone information must be preserved when saving attachments.

STIG ID: WN11-UC-000020  |  SRG: SRG-OS-000480-GPOS-00227 |  Severity: medium |  CCI: CCI-000366 |  Vulnerability Id: V-253478 | 

Vulnerability Discussion

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 it exists and is configured with a value of "1", this is a finding.

Registry Hive: HKEY_CURRENT_USER
Registry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Attachments\

Value Name: SaveZoneInformation

Value Type: REG_DWORD
Value: 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.

To correct this, 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".
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