TippingPoint Zero Day Initiative

Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow Vulnerability

ZDI-07-012: April 3rd, 2007


Affected Vendors

Affected Products

    Yahoo! Messenger

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 4791. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Yahoo Messenger. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific flaw exists within the ActiveX control Yahoo.AudioConf:

DLL: yacscom.dll
CLSID: 2B323CD9-50E3-11D3-9466-00A0C9700498

When large values are specified for the 'socksHostname' and 'hostname' properties, and the createAndJoinConference() method is called, a stack overflow occurs. Exploitation can result in code execution under the context of the current user.

Vendor Response

Yahoo! has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2006-10-27 - Vulnerability reported to vendor
    2007-04-03 - Coordinated public release of advisory


This vulnerability was discovered by:
    Peter Vreugdenhil