Title

Outlook Rich Text options must be set for converting to plain text format. (Cat II impact)

Discussion

Outlook automatically converts RTF formatted messages that are sent over the Internet to HTML format, so that the message formatting is maintained and attachments are received. This setting controls how Outlook sends Rich Text Format (RTF) messages to Internet recipients.

Check Content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Mail Format -> Internet Formatting "Outlook Rich Text options" is "Enabled: Convert to Plain Text format". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\options\mail Criteria: If the value Message RTF Format is REG_DWORD = 1, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Mail Format -> Internet Formatting "Outlook Rich Text options" to "Enabled: Convert to Plain Text format".

Additional Identifiers

Rule ID: SV-54067r1_rule

Vulnerability ID: V-26633

Group Title: DTOO344 - Outlook Rich Text options

Expert Comments

CCIs tied to check.

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