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V-278240

CAT II (Medium)

Windows Server 2025 must preserve zone information when saving attachments.

Rule ID

SV-278240r1182207_rule

STIG

Microsoft Windows Server 2025 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

Discussion

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 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.

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".