Title

Font downloads must be disallowed (Restricted Sites zone). (Cat II impact)

Discussion

It is possible that a font could include malformed data that would cause Internet Explorer to crash when it attempts to load and render the font. Downloads of fonts can sometimes contain malicious code. Files should not be downloaded from restricted sites. This policy setting allows you to manage whether pages of the zone may download HTML fonts.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> "Allow font downloads" must be "Enabled", and "Disable" selected from the drop-down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4 Criteria: If the value 1604 is REG_DWORD = 3, this is not a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> "Allow font downloads" to "Enabled", and select "Disable" from the drop-down box.

Additional Identifiers

Rule ID: SV-45159r1_rule

Vulnerability ID: V-6295

Group Title: DTBI120-Font download control - Restricted Sites

Expert Comments

CCIs tied to check.

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