Vulnerability Note VU#181041

Macrovision / InstallShield InstallFromTheWeb buffer overflows

Original Release date: 22 Feb 2007 | Last revised: 23 Feb 2007


Macrovision / InstallShield InstallFromTheWeb contains multiple buffer overflows, which could allow an attacker to execute arbitrary code on a vulnerable system.


InstallShield InstallFromTheWeb is a web-based software installation product for Microsoft Windows systems. InstallFromTheWeb is available as an ActiveX control for Internet Explorer and also as a Netscape-style plug-in for other web browsers. The ActiveX control is provided by the file iftw.dll, and the plug-in is provided by the file npiftw32.dll. InstallFromTheWeb contains multiple buffer overflows.

Note that InstallShield has been acquired by Macrovision. The InstallFromTheWeb product is no longer supported by Macrovision.


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 the web browser to crash.


We are currently unaware of a practical solution to this problem.

Disable the InstallFromTheWeb ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:

More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:
    Windows Registry Editor Version 5.00

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{4E330863-6A11-11D0-BFD8-006097237877}]
    "Compatibility Flags"=dword:00000400
Remove the InstallFromTheWeb plug-in

The vulnerable plug-in can be removed by deleting the npiftw32.dll file.

Disable ActiveX

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

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Macrovision-InstallShieldAffected19 Oct 200619 Feb 2007
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This vulnerability was reported by Will Dormann of CERT/CC

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2007-0320
  • Date Public: 22 Feb 2007
  • Date First Published: 22 Feb 2007
  • Date Last Updated: 23 Feb 2007
  • Severity Metric: 5.16
  • Document Revision: 17


If you have feedback, comments, or additional information about this vulnerability, please send us email.