The flaw is caused by a boundary error within the AudioConf ActiveX control (yacscom.dll), according to an advisory from Secunia.
The vulnerability can be exploited to cause a stack-based buffer overflow by setting the "socksHostname" and "hostname" properties to an overly large strong and then calling the "createAndJoinConference()" method, according to Secunia’s advisory.
The flaw exists in Yahoo Messenger versions 5, 6, 7 and 8, according to Secunia.
An advisory from TippingPoint’s Zero Day Initiative, which first disclosed the flaw to Yahoo last October, reported that user interaction is required to exploit the flaw, most commonly through a duped user visiting a malicious website.
Secunia today ranked the flaw as "highly critical," meaning that it can be exploited by arbitrary code.
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iTnews State of Security Breakfast Sydney
iTnews Executive Retreat - Security Leaders Edition - VIC
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