Yahoo has fixed a Yahoo Messenger flaw attackers could exploit to hijack targeted machines.

According to the French Security Incident Response Team, the problem is a buffer overflow error in the “AudioConf” ActiveX control (yacscom.dll) that surfaces when overly long arguments are passed along via the “createAndJoinConference()” method. Attackers could exploit this to run arbitrary commands by tricking a user into visiting a specially crafted Web page.

Yahoo Messenger 8 is affected, and users are advised to download the latest version.