Title

File Downloads must be configured for proper restrictions in PowerPoint Viewer. (Cat II impact)

Discussion

Disabling this setting allows websites to present file download prompts via code without the user specifically initiating the download. User preferences may also allow the download to occur without prompting or interaction with the user. Even if Internet Explorer prompts the user to accept the download, some websites abuse this functionality. Malicious websites may continually prompt users to download a file or present confusing dialog boxes to trick users into downloading or running a file. If the download occurs and it contains malicious code, the code could become active on the user's computer or the network.

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict File Download" is set to "Enabled" and 'pptview.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_RESTRICT_FILEDOWNLOAD Criteria: If the value pptview.exe is REG_DWORD = 1, this is not a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict File Download" to "Enabled" and 'pptview.exe' is checked.

Additional Identifiers

Rule ID: SV-54950r1_rule

Vulnerability ID: V-42331

Group Title: DTOO508 - Restrict File Download in PowerPoint Viewer

Expert Comments

CCIs tied to check.

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