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V-220955

CAT II (Medium)

Zone information must be preserved when saving attachments.

Rule ID

SV-220955r569187_rule

STIG

Microsoft Windows 10 Security Technical Implementation Guide

Version

V2R9

CCIs

CCI-000366

Discussion

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

Check Content

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

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".