A remote code execution vulnerability, which could allow an attacker to gain the same rights as the current logged on user upon successful exploitation has been discovered in the TabStrip ActiveX common control (MSCOMCTL.OCX). In order to exploit this vulnerability, an attacker needs to lure the user into visiting a malicious website using a web browser that supports ActiveX controls or convince a user to open a specially crafted document, which could for example be sent as an email attachment.
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The vulnerability exists in the TabStrip ActiveX control of the Windows common controls, contained in MSCOMCTL.OCX file. An attacker could either craft a document (example: Rich Text Format [RTF] file) or a webpage to exploit this vulnerability. Upon successful exploitation, the attacker gains the ability to execute arbitrary code, in the security context of the user who opens the attacker crafted document or visits the attacker crafted webpage with an ActiveX enabled browser such as Microsoft Internet Explorer. This attack vector however is mitigated if Internet Explorer is operating in a restricted mode known as Enhanced Security Configuration, which is default on the Windows Server 2003 and Windows Server 2008 operating system versions.
A patch is available, see references below for details.
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