Zone information must be preserved when saving attachments.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253478	WN11-UC-000020	SV-253478r829518_rule		Medium

Description
Preserving zone of origin (internet, intranet, local, restricted) information on file attachments allows Windows to determine risk.

STIG	Date
Microsoft Windows 11 Security Technical Implementation Guide	2023-09-29

Details

Check Text ( C-56931r829516_chk )
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 Text (F-56881r829517_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".