__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Yahoo! ActiveX Audio Conferencing Update [031207] April 12, 2007 17:00 GMT Number R-204 ______________________________________________________________________________ PROBLEM: Yahoo! recently identified a security issue, commonly referred to as a buffer overflow in an ActiveX control. This control is part of the Yahoo! Messenger audio conferencing code. PLATFORM: Yahoo! Messenger Version 1.0.0.47 DAMAGE: Could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. SOLUTION: Upgrade to Version 1.0.0.48 or higher. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Could allow a remote, unauthenticated ASSESSMENT: attacker to execute arbitrary code on a vulnerable system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-204.shtml ORIGINAL BULLETIN: http://messenger.yahoo.com/security_update.php;_ylt= AkQgcpun6x0v49V3Uxj7PSnlLdMF?id=031207 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-1680 ______________________________________________________________________________ [***** Start 031207 *****] Yahoo! ActiveX Audio Conferencing Update Posted 2007-04-02 Do I need to update Yahoo! Messenger to the new version? Yes, if you are using a version of the All New Yahoo! Messenger obtained before March 13, 2007 on a Windows PC. How do I get the Security Update? You can download the latest version of Yahoo! Messenger from http://messenger.yahoo.com. What is the security issue? Yahoo! recently identified a security issue, commonly referred to as a buffer overflow in an ActiveX control. This control is part of the Yahoo! Messenger audio conferencing code. Which organization informed Yahoo!? Yahoo! has relationships with third-party security organizations and researchers. Yahoo! was informed of this particular issue from TippingPoint and the Zero Day Initiative. What is the potential impact? Some impacts of a buffer overflow might include being involuntarily logged out of a Chat and/or Instant Messaging session, the crash of an application such as Internet Explorer, and in some instances, the introduction of executable code. For this specific security issue, these impacts could only be possible if an attacker is successful in prompting someone to view malicious HTML code, most likely executed by getting a person to visit their web page. Who is affected? Yahoo! Messenger users who inadvertently view malicious HTML code on an attacker's website. If your computer has installed Yahoo! Messenger before March 13, 2007, you should install the update. Why do I have to install the update? Installing the update helps protect against exploits of this issue that may be developed. How long will it take? The update should take no more than a couple minutes, although the exact time depends on the speed of your Internet connection. What if I don't install the update? When you sign into Yahoo! Messenger, you will be prompted to update. Yahoo! will be notifying users worldwide through these prompts over the next several weeks. If you choose not to update and you have not updated via this page or at messenger.yahoo.com, the vulnerability will still exist. I'm a technical user. What is the CLSID and exact version of the control that contains the fix? The CLSID is 2B323CD9-50E3-11D3-9466-00A0C9700498 and the version is 1.0.0.48. [***** End 031207 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Yahoo! for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. 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Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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