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Category:   Application (Instant Messaging/IRC/Chat)  >   Yahoo Messenger Vendors:   Yahoo
Yahoo! Messenger Buffer Overflow in AudioConf ActiveX Control Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017867
SecurityTracker URL:
CVE Reference:   CVE-2007-1680   (Links to External Site)
Date:  Apr 4 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.x
Description:   A vulnerability was reported in Yahoo! Messenger. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a stack overflow in 'yacscom.dll' and execute arbitrary code on the target system. The code will run with the privileges of the target user.

The CLSID of the affected control is 85A4A99C-8C3D-499E-A386-E0743DFF8FB7.

Specially crafted values for the 'socksHostname' and 'hostname' parameters can trigger the overflow in the createAndJoinConference() function.

The vendor was notified on October 27, 2006.

Peter Vreugdenhil discovered this vulnerability.

The original advisory is available at:

Impact:   A remote user can create a file that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fix. Yahoo! Messenger users will be prompted to update when the login to the service.

The Yahoo advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  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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