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Zone information must be preserved when saving attachments.


Overview

Finding ID Version Rule ID IA Controls Severity
V-220955 WN10-UC-000020 SV-220955r569187_rule Medium
Description
Preserving zone of origin (internet, intranet, local, restricted) information on file attachments allows Windows to determine risk.
STIG Date
Windows 10 Security Technical Implementation Guide 2021-08-18

Details

Check Text ( C-22670r555350_chk )
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_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-22659r555351_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".