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Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow
ZDI-07-012: Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow
ZDI-07-012: Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow

ZDI-07-012: Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow
April  3, 2007

-- CVE ID:

-- Affected Vendor:

-- 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:


-- 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:


-- 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:


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.

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