Title

Set custom Outlook Object Model (OOM) action execution prompt - Outlook. (Cat II impact)

Discussion

Custom actions add functionality to Outlook 2007 that can be triggered as part of a rule. Among other possible features, custom actions can be created that reply to messages in ways that circumvent the Outlook model's programmatic send protections. By default, when Outlook or another program initiates a custom action using the Outlook object model, users are prompted to allow or reject the action. If this configuration is changed, malicious code can use the Outlook object model to compromise sensitive information or otherwise cause data and computing resources to be at risk.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Office Outlook 2007 -> Security -> Security Form Settings -> Custom Form Security “Set Outlook object model Custom Actions execution prompt” will be set to “Enabled (Automatically Deny)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\12.0\Outlook\Security Criteria: If the value PromptOOMCustomAction is REG_DWORD = 0, this is not a finding.

Fix Text

The policy value for User Configuration -> Administrative Templates -> Microsoft Office Outlook 2007 -> Security -> Security Form Settings -> Custom Form Security “Set Outlook object model Custom Actions execution prompt” will be set to “Enabled (Automatically Deny)”.

Additional Identifiers

Rule ID: SV-19030r1_rule

Vulnerability ID: V-17802

Group Title:

Expert Comments

CCIs tied to check.

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