Technical Description

Two vulnerabilities have been identified in Yahoo! Messenger, which could be exploited by remote attackers to take complete control of an affected system.

The first issue is caused by a buffer overflow error in the Webcam Upload ActiveX control (ywcupl.dll) when processing an overly long "Server" property while calling the "Send()" method, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

The second vulnerabilityy is caused by a buffer overflow error in the Webcam Viewer ActiveX control (ywcvwr.dll) when processing an overly long "Server" property while calling the "Receive()" method, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

Affected Products

Yahoo! Messenger version 8.1.0.249 and prior

Solution

Upgrade to Yahoo! Messenger version 8.1.0.401 :
http://messenger.yahoo.com/download.php

References

http://www.vupen.com/english/advisories/2007/2094
http://messenger.yahoo.com/security_update.php?id=060707

Credits

Vulnerabilities reported by Danny.

ChangeLog

2007-06-07 : Initial release
2007-06-07 : Updated Solution

Vulnerability Management

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