User interaction is required in that a user must browse to a malicious website. The specific flaws exists in the instantiation of three specific ActiveX controls. The combination of loading all three controls in a particular order results in a transfer of control to unallocated memory which can be leveraged by remote attackers to execute arbitrary code under the context of the currently logged in user
Patch Availability:
Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS10-044.mspx