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A remote code execution vulnerability exists in the way Internet Explorer instantiates COM objects that are not intended to be instantiated in Internet Explorer. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user visited the specially crafted Web site.


An attacker who successfully exploited this vulnerability could take complete control of an affected system.

Technical details (analysis)

When Internet Explorer tries to instantiate certain COM objects as ActiveX Controls, the COM objects may corrupt the system state in such a way that an attacker could execute arbitrary code. Particularly, a COM object that is instantiated within IE, can take advantage of a vulnerability that IE was never meant to run this COM object as an ActiveX control.

Affected software

Microsoft Windows 2000 Service Pack 4
Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2
Microsoft Windows XP Professional x64 Edition
Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1
Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems
Microsoft Windows Server 2003 x64 Edition
Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (Me)

Non-affected software

All applications not on the affected list.



NIS signature

Name: Exploit:Win/COM.ActiveX.RCE!CVE-2006-1303
Release Date: 2006-07-13T00:00:00

Known false positives

No known false positives at this time.


Configure Internet Explorer to prompt before running ActiveX Controls or disable ActiveX Controls in the Internet and Local intranet security zone.
Set Internet and Local intranet security zone settings to “High” to prompt before running ActiveX Controls and Active Scripting in these zones.
Prevent COM objects from running in Internet Explorer.