Rule:--Sid:13783--Summary:This event is generated when an attempt is made to exploit a known vulnerability in an ActiveX control.--Impact:A successful attack can cause a buffer overflow and the subsequent execution of arbitrary code with system level privileges on a vulnerable host.--Detailed Information:A vulnerability exists in the way that Internet Explorer handles ActiveX controls that may present an attacker with the opportunity to run code of their choosing on a host.In particular, this event is generated when a call to the yahoo_assistant is made. This may indicate an attempt to exploit known vulnerabilities in that ActiveX control which may lead to a system compromise.The ActiveX Control (yNotifier.dll) in Yahoo! Assistant 3.6 and earlier allows remote attackers to execute arbitrary code via unspecified vectors in the Ynoifier COM object that trigger memory corruption.--Affected Systems:Microsoft Windows systems using the yahoo_assistant ActiveX control--Attack Scenarios:An attacker can host a web site that will return code of their choosing to the object when a victim clicks on a malicious link.--Ease of Attack:Simple.--False Positives:None known.--False Negatives:None known.--Corrective Action:Upgrade to the most current non-affected version of the product.--Contributors:This document was generated from data supplied by the National Vulnerability Database. A product of the National Institute of Standards and Technology.For more information see http://nvd.nist.gov/Sourcefire Vulnerability Research TeamAlex Kirk <akirk@sourcefire.com>Nigel Houghton <nigel.houghton@sourcefire.com>--Additional References--