ZDI-07-012: Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow http://www.zerodayinitiative.com/advisories/ZDI-07-012.html April 3, 2007 -- CVE ID: CVE-2007-1680 -- Affected Vendor: Yahoo! -- Affected Products: Yahoo! Messenger 8.x -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since November 10, 2006 by Digital Vaccine protection filter ID 4791. For further product information on the TippingPoint IPS: http://www.tippingpoint.com -- 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: 85A4A99C-8C3D-499E-A386-E0743DFF8FB7 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: http://messenger.yahoo.com/security_update.php?id=031207 -- Disclosure Timeline: 2006.10.27 - Vulnerability reported to vendor 2006.11.10 - Digital Vaccine released to TippingPoint customers 2007.04.03 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by Peter Vreugdenhil. -- About the Zero Day Initiative (ZDI): Established by TippingPoint, a division of 3Com, The Zero Day Initiative (ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities. Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at: http://www.zerodayinitiative.com The ZDI is unique in how the acquired vulnerability information is used. 3Com does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, 3Com provides its customers with zero day protection through its intrusion prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, 3Com provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product.