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WN22-UC-000010 Windows Server 2022 must preserve zone information when saving attachments.

DISA STIG library V2R11
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

Windows Server 2022 must preserve zone information when saving attachments.

Control

Note: This Check must be performed for each interactive user profile on the system. 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) Note: This requirement is applicable to profiles for interactive logins. It is not applicable for Service accounts. To determine the system's enabled user profiles: Run "PowerShell" as an administrator. Execute the following command: Get-LocalUser | Where-Object {$_.Enabled -eq $true}

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.

Related controls

CCI-000366

Fix

The default behavior is for Windows to mark file attachments with their zone information. If this needs to be corrected, for each user profile on the system 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".