Software Engineering Institute

The Microsoft WebViewFolderIcon object is an ActiveX control that comes with Microsoft Windows. This control, which is provided by the file webvw.dll, provides support functionality for icons in the Windows Explorer Web view. The slice method of the WebViewFolderIcon control contains an integer overflow vulnerability.

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.The complete impact of this vulnerability is not yet known.

Apply an update

This vulnerability is addressed in Microsoft Security Bulletin MS06-057.

Disable the WebViewFolderIcon ActiveX control

The WebViewFolderIcon ActiveX control can be disabled by setting the kill bit for the following CLSIDs:

{844F4806-E8A8-11d2-9652-00C04FC30871}
{E5DF9D10-3B52-11D1-83E8-00A0C90DC849}
More information about how to set the kill bit is available in Microsoft Support Document 240797.

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this vulnerability. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document and the Malicious Web Scripts FAQ.