Platform: Windows. Date: Vulnerable App:. MHT file on disk, Internet Explorer ActiveX control warnings as well as popup blocker privacy settings are not enforced.
This can allow the execution of ActiveX content with zero warning to an unsuspecting end user and or force them to visit arbitrary attacker controlled websites. By default when opening browser associated files that contain active content, MSIE restricts scripts from running without explicit user interaction and permission.
Instead end users are presented with a yellow warning bar on the browsers webpage, asking first if they wish to allow the running of blocked content. This prevents execution of active content scripts or controls without the user first clicking the "Allow blocked content" warning bar. However, specially crafted MHT files residing on disk that contain an invalid header directive suppress ActiveX warnings and Popup blocker privacy settings.
Therefore, to bypass Internet Explorer "active content" blocking, files needs to contain an Content-Location header using an arbitrary named value E.
Active X Installer service on the computer should be started, then on Internet Explorer you will get a pop-up that will allow to install this add-on. Follow the steps to start the service. Click Start. Type Services in Start Search. Right click on Active X installer.
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