Technical Description

A vulnerability has been identified in Yahoo! Messenger, which could be exploited by remote attackers to cause a denial of service or take complete control of an affected system. This issue is caused by a buffer overflow error in the Get Version Info (YVerInfo.dll) ActiveX control when processing malformed data passed to the "fvCom()" or "info()" methods, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

Note : The affected functions can only be called if the control is run from the yahoo.com domain. In order for this vulnerability to be exploited an attacker would either have to leverage a cross-site scripting attack in the yahoo.com domain, or be able to control the victim's DNS resolution for the domain.

Affected Products

Yahoo! Messenger versions 8.x

Solution

Upgrade to the latest version :
http://messenger.yahoo.com/download.php

References

http://www.vupen.com/english/advisories/2007/3011
http://messenger.yahoo.com/security_update.php?id=082907
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=591

Credits

Vulnerability reported by iDefense Labs.

ChangeLog

2007-08-30 : Initial release
2007-08-30 : Updated Description

Vulnerability Management

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