Title

Outlook Object Model scripts must be disallowed to run for public folders. (Cat II impact)

Discussion

In Outlook, folders can be associated with custom forms or folder home pages that include scripts that access the Outlook object model. These scripts can add functionality to the folders and items contained within, but dangerous scripts can pose security risks. By default, Outlook allows scripts included in custom forms or folder home pages for public folders to execute. If users inadvertently run dangerous scripts when using public folders, their computers or data could be at risk.

Check Content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Other -> Advanced "Do not allow Outlook object model scripts to run for public folders" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security Criteria: If the value PublicFolderScript is REG_DWORD = 0, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Other -> Advanced "Do not allow Outlook object model scripts to run for public folders" to "Enabled".

Additional Identifiers

Rule ID: SV-53903r1_rule

Vulnerability ID: V-17675

Group Title: DTOO233 - OOM scripts for Public Folders

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.